diff --git a/vehicle/2.0/IVehicle.hal b/vehicle/2.0/IVehicle.hal
index cab6ce0..dc13089 100644
--- a/vehicle/2.0/IVehicle.hal
+++ b/vehicle/2.0/IVehicle.hal
@@ -32,7 +32,7 @@
    * StatusCode::INVALID_ARG, otherwise a list of vehicle property
    * configurations with StatusCode::OK
    */
-  getPropConfigs(vec<VehicleProperty> props)
+  getPropConfigs(vec<int32_t> props)
           generates (StatusCode status, vec<VehiclePropConfig> propConfigs);
 
   /**
@@ -84,7 +84,7 @@
    * If this client wasn't subscribed to the given property, this method
    * must return StatusCode::INVALID_ARG.
    */
-  unsubscribe(IVehicleCallback callback, VehicleProperty propId)
+  unsubscribe(IVehicleCallback callback, int32_t propId)
           generates (StatusCode status);
 
   /**
diff --git a/vehicle/2.0/IVehicleCallback.hal b/vehicle/2.0/IVehicleCallback.hal
index e7e05bf..eb626ff 100644
--- a/vehicle/2.0/IVehicleCallback.hal
+++ b/vehicle/2.0/IVehicleCallback.hal
@@ -54,6 +54,6 @@
      *                 occurred, must be 0 for global properties
      */
     oneway onPropertySetError(StatusCode errorCode,
-                              VehicleProperty propId,
+                              int32_t propId,
                               int32_t areaId);
 };
diff --git a/vehicle/2.0/default/VehicleHal.h b/vehicle/2.0/default/VehicleHal.h
index 2807f28..c882def 100644
--- a/vehicle/2.0/default/VehicleHal.h
+++ b/vehicle/2.0/default/VehicleHal.h
@@ -36,7 +36,7 @@
 
     using HalEventFunction = std::function<void(VehiclePropValuePtr)>;
     using HalErrorFunction = std::function<void(
-            StatusCode errorCode, VehicleProperty property, int32_t areaId)>;
+            StatusCode errorCode, int32_t property, int32_t areaId)>;
 
     virtual ~VehicleHal() {}
 
@@ -57,16 +57,16 @@
      *                   rate, e.g. for properties with
      *                   VehiclePropertyChangeMode::CONTINUOUS
      */
-    virtual StatusCode subscribe(VehicleProperty property,
-                               int32_t areas,
-                               float sampleRate) = 0;
+    virtual StatusCode subscribe(int32_t property,
+                                 int32_t areas,
+                                 float sampleRate) = 0;
 
     /**
      * Unsubscribe from HAL events for given property
      *
      * @param property vehicle property to unsubscribe
      */
-    virtual StatusCode unsubscribe(VehicleProperty property) = 0;
+    virtual StatusCode unsubscribe(int32_t property) = 0;
 
     /**
      * Override this method if you need to do one-time initialization.
@@ -95,7 +95,8 @@
 
     /* Propagates error during set operation to the vehicle HAL clients. */
     void doHalPropertySetError(StatusCode errorCode,
-                               VehicleProperty propId, int32_t areaId) {
+                               int32_t propId,
+                               int32_t areaId) {
         mOnHalPropertySetError(errorCode, propId, areaId);
     }
 
diff --git a/vehicle/2.0/default/impl/DefaultConfig.h b/vehicle/2.0/default/impl/DefaultConfig.h
index 12c1c1b..85bba2c 100644
--- a/vehicle/2.0/default/impl/DefaultConfig.h
+++ b/vehicle/2.0/default/impl/DefaultConfig.h
@@ -29,20 +29,20 @@
 
 const VehiclePropConfig kVehicleProperties[] = {
     {
-        .prop = VehicleProperty::INFO_MAKE,
+        .prop = toInt(VehicleProperty::INFO_MAKE),
         .access = VehiclePropertyAccess::READ,
         .changeMode = VehiclePropertyChangeMode::STATIC,
     },
 
     {
-        .prop = VehicleProperty::HVAC_POWER_ON,
+        .prop = toInt(VehicleProperty::HVAC_POWER_ON),
         .access = VehiclePropertyAccess::READ_WRITE,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
         .supportedAreas = toInt(VehicleAreaZone::ROW_1)
     },
 
     {
-        .prop = VehicleProperty::HVAC_DEFROSTER,
+        .prop = toInt(VehicleProperty::HVAC_DEFROSTER),
         .access = VehiclePropertyAccess::READ_WRITE,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
         .supportedAreas =
@@ -51,28 +51,28 @@
     },
 
     {
-        .prop = VehicleProperty::HVAC_RECIRC_ON,
+        .prop = toInt(VehicleProperty::HVAC_RECIRC_ON),
         .access = VehiclePropertyAccess::READ_WRITE,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
         .supportedAreas = toInt(VehicleAreaZone::ROW_1)
     },
 
     {
-        .prop = VehicleProperty::HVAC_AC_ON,
+        .prop = toInt(VehicleProperty::HVAC_AC_ON),
         .access = VehiclePropertyAccess::READ_WRITE,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
         .supportedAreas = toInt(VehicleAreaZone::ROW_1)
     },
 
     {
-        .prop = VehicleProperty::HVAC_AUTO_ON,
+        .prop = toInt(VehicleProperty::HVAC_AUTO_ON),
         .access = VehiclePropertyAccess::READ_WRITE,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
         .supportedAreas = toInt(VehicleAreaZone::ROW_1)
     },
 
     {
-        .prop = VehicleProperty::HVAC_FAN_SPEED,
+        .prop = toInt(VehicleProperty::HVAC_FAN_SPEED),
         .access = VehiclePropertyAccess::READ_WRITE,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
         .supportedAreas = toInt(VehicleAreaZone::ROW_1),
@@ -86,14 +86,14 @@
     },
 
     {
-        .prop = VehicleProperty::HVAC_FAN_DIRECTION,
+        .prop = toInt(VehicleProperty::HVAC_FAN_DIRECTION),
         .access = VehiclePropertyAccess::READ_WRITE,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
         .supportedAreas = toInt(VehicleAreaZone::ROW_1),
     },
 
     {
-        .prop = VehicleProperty::HVAC_TEMPERATURE_SET,
+        .prop = toInt(VehicleProperty::HVAC_TEMPERATURE_SET),
         .access = VehiclePropertyAccess::READ_WRITE,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
         .supportedAreas =
@@ -114,25 +114,25 @@
     },
 
     {
-        .prop = VehicleProperty::NIGHT_MODE,
+        .prop = toInt(VehicleProperty::NIGHT_MODE),
         .access = VehiclePropertyAccess::READ,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
     },
 
     {
-        .prop = VehicleProperty::DRIVING_STATUS,
+        .prop = toInt(VehicleProperty::DRIVING_STATUS),
         .access = VehiclePropertyAccess::READ,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
     },
 
     {
-        .prop = VehicleProperty::GEAR_SELECTION,
+        .prop = toInt(VehicleProperty::GEAR_SELECTION),
         .access = VehiclePropertyAccess::READ,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
     },
 
     {
-        .prop = VehicleProperty::INFO_FUEL_CAPACITY,
+        .prop = toInt(VehicleProperty::INFO_FUEL_CAPACITY),
         .access = VehiclePropertyAccess::READ,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
         .areaConfigs = {
@@ -144,7 +144,7 @@
     },
 
     {
-        .prop = VehicleProperty::DISPLAY_BRIGHTNESS,
+        .prop = toInt(VehicleProperty::DISPLAY_BRIGHTNESS),
         .access = VehiclePropertyAccess::READ_WRITE,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
         .areaConfigs = {
@@ -156,19 +156,19 @@
     },
 
     {
-        .prop = VehicleProperty::IGNITION_STATE,
+        .prop = toInt(VehicleProperty::IGNITION_STATE),
         .access = VehiclePropertyAccess::READ,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
     },
 
     {
-        .prop = VehicleProperty::OBD2_LIVE_FRAME,
+        .prop = toInt(VehicleProperty::OBD2_LIVE_FRAME),
         .access = VehiclePropertyAccess::READ,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
     },
 
     {
-        .prop = VehicleProperty::OBD2_FREEZE_FRAME,
+        .prop = toInt(VehicleProperty::OBD2_FREEZE_FRAME),
         .access = VehiclePropertyAccess::READ,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
     }
diff --git a/vehicle/2.0/default/impl/DefaultVehicleHal.cpp b/vehicle/2.0/default/impl/DefaultVehicleHal.cpp
index 4541168..65bd49d 100644
--- a/vehicle/2.0/default/impl/DefaultVehicleHal.cpp
+++ b/vehicle/2.0/default/impl/DefaultVehicleHal.cpp
@@ -31,7 +31,7 @@
     *outStatus = StatusCode::OK;
 
     VehiclePropValuePtr v;
-    VehicleProperty property = requestedPropValue.prop;
+    auto property = static_cast<VehicleProperty>(requestedPropValue.prop);
     int32_t areaId = requestedPropValue.areaId;
     auto& pool = *getValuePool();
 
@@ -103,7 +103,7 @@
     }
 
     if (StatusCode::OK == *outStatus && v.get() != nullptr) {
-        v->prop = property;
+        v->prop = toInt(property);
         v->areaId = areaId;
         v->timestamp = elapsedRealtimeNano();
     }
@@ -112,7 +112,7 @@
 }
 
 StatusCode DefaultVehicleHal::set(const VehiclePropValue& propValue) {
-    auto property = propValue.prop;
+    auto property = static_cast<VehicleProperty>(propValue.prop);
     const auto& v = propValue.value;
 
     StatusCode status = StatusCode::OK;
diff --git a/vehicle/2.0/default/impl/DefaultVehicleHal.h b/vehicle/2.0/default/impl/DefaultVehicleHal.h
index 15a4789..b01c963 100644
--- a/vehicle/2.0/default/impl/DefaultVehicleHal.h
+++ b/vehicle/2.0/default/impl/DefaultVehicleHal.h
@@ -40,14 +40,14 @@
 
     StatusCode set(const VehiclePropValue& propValue) override;
 
-    StatusCode subscribe(VehicleProperty property,
-                       int32_t areas,
-                       float sampleRate) {
+    StatusCode subscribe(int32_t /*property*/,
+                         int32_t /*areas*/,
+                         float /*sampleRate*/) override {
         // TODO(pavelm): implement
         return StatusCode::OK;
     }
 
-    StatusCode unsubscribe(VehicleProperty property) {
+    StatusCode unsubscribe(int32_t /*property*/) override {
         // TODO(pavelm): implement
         return StatusCode::OK;
     }
diff --git a/vehicle/2.0/default/tests/AccessControlConfigParser_test.cpp b/vehicle/2.0/default/tests/AccessControlConfigParser_test.cpp
index 92d7e39..5b09135 100644
--- a/vehicle/2.0/default/tests/AccessControlConfigParser_test.cpp
+++ b/vehicle/2.0/default/tests/AccessControlConfigParser_test.cpp
@@ -20,6 +20,7 @@
 #include <unordered_set>
 
 #include "vehicle_hal_manager/AccessControlConfigParser.h"
+#include <vehicle_hal_manager/VehicleUtils.h>
 
 namespace android {
 namespace hardware {
@@ -31,9 +32,9 @@
 class AccessControlConfigParserTest : public ::testing::Test {
 protected:
     void SetUp() override {
-        std::vector<VehicleProperty> supportedProperties {
-            VehicleProperty::HVAC_FAN_SPEED,
-            VehicleProperty::HVAC_FAN_DIRECTION,
+        std::vector<int32_t> supportedProperties {
+            toInt(VehicleProperty::HVAC_FAN_SPEED),
+            toInt(VehicleProperty::HVAC_FAN_DIRECTION),
         };
         parser.reset(new AccessControlConfigParser(supportedProperties));
     }
@@ -49,10 +50,10 @@
     ASSERT_TRUE(parser->parseFromStream(&file, &aclMap));
 
     ASSERT_EQ(1, aclMap.size());
-    auto it = aclMap.find(VehicleProperty::HVAC_FAN_SPEED);
+    auto it = aclMap.find(toInt(VehicleProperty::HVAC_FAN_SPEED));
     ASSERT_NE(aclMap.end(), it);
     ASSERT_EQ(VehiclePropertyAccess::READ_WRITE, it->second.access);
-    ASSERT_EQ(VehicleProperty::HVAC_FAN_SPEED, it->second.propId);
+    ASSERT_EQ(toInt(VehicleProperty::HVAC_FAN_SPEED), it->second.propId);
     ASSERT_EQ(1000u, it->second.uid);
 }
 
@@ -68,7 +69,7 @@
 
     ASSERT_TRUE(parser->parseFromStream(&file, &aclMap));
 
-    auto range = aclMap.equal_range(VehicleProperty::HVAC_FAN_SPEED);
+    auto range = aclMap.equal_range(toInt(VehicleProperty::HVAC_FAN_SPEED));
     for (auto it = range.first; it != range.second; ++it) {
         auto& acl = it->second;
 
@@ -92,10 +93,10 @@
     ASSERT_FALSE(parser->parseFromStream(&file, &aclMap));
 
     ASSERT_EQ(1, aclMap.size());
-    auto it = aclMap.find(VehicleProperty::HVAC_FAN_SPEED);
+    auto it = aclMap.find(toInt(VehicleProperty::HVAC_FAN_SPEED));
     ASSERT_NE(aclMap.end(), it);
     ASSERT_EQ(VehiclePropertyAccess::READ, it->second.access);
-    ASSERT_EQ(VehicleProperty::HVAC_FAN_SPEED, it->second.propId);
+    ASSERT_EQ(toInt(VehicleProperty::HVAC_FAN_SPEED), it->second.propId);
     ASSERT_EQ(0xbeef, it->second.uid);
 }
 
@@ -127,16 +128,16 @@
     ASSERT_TRUE(parser->parseFromStream(&configFile2, &aclMap));
     ASSERT_EQ(2, aclMap.size());
 
-    auto it = aclMap.find(VehicleProperty::HVAC_FAN_SPEED);
+    auto it = aclMap.find(toInt(VehicleProperty::HVAC_FAN_SPEED));
     ASSERT_NE(aclMap.end(), it);
     ASSERT_EQ(VehiclePropertyAccess::READ_WRITE, it->second.access);
-    ASSERT_EQ(VehicleProperty::HVAC_FAN_SPEED, it->second.propId);
+    ASSERT_EQ(toInt(VehicleProperty::HVAC_FAN_SPEED), it->second.propId);
     ASSERT_EQ(1000u, it->second.uid);
 
-    it = aclMap.find(VehicleProperty::HVAC_FAN_DIRECTION);
+    it = aclMap.find(toInt(VehicleProperty::HVAC_FAN_DIRECTION));
     ASSERT_NE(aclMap.end(), it);
     ASSERT_EQ(VehiclePropertyAccess::READ_WRITE, it->second.access);
-    ASSERT_EQ(VehicleProperty::HVAC_FAN_DIRECTION, it->second.propId);
+    ASSERT_EQ(toInt(VehicleProperty::HVAC_FAN_DIRECTION), it->second.propId);
     ASSERT_EQ(1004u, it->second.uid);
 }
 
diff --git a/vehicle/2.0/default/tests/SubscriptionManager_test.cpp b/vehicle/2.0/default/tests/SubscriptionManager_test.cpp
index 863142e..1b12bfd 100644
--- a/vehicle/2.0/default/tests/SubscriptionManager_test.cpp
+++ b/vehicle/2.0/default/tests/SubscriptionManager_test.cpp
@@ -36,8 +36,8 @@
 public:
     SubscriptionManager manager;
 
-    const VehicleProperty PROP1 = VehicleProperty::HVAC_FAN_SPEED;
-    const VehicleProperty PROP2 = VehicleProperty::DISPLAY_BRIGHTNESS;
+    static constexpr int32_t PROP1 = toInt(VehicleProperty::HVAC_FAN_SPEED);
+    static constexpr int32_t PROP2 = toInt(VehicleProperty::DISPLAY_BRIGHTNESS);
 
     sp<IVehicleCallback> cb1 = new MockedVehicleCallback();
     sp<IVehicleCallback> cb2 = new MockedVehicleCallback();
@@ -116,7 +116,7 @@
 
     // Wrong prop
     clients = manager.getSubscribedClients(
-            VehicleProperty::AP_POWER_BOOTUP_REASON,
+            toInt(VehicleProperty::AP_POWER_BOOTUP_REASON),
             toInt(VehicleAreaZone::ROW_1_LEFT),
             SubscribeFlags::HAL_EVENT);
     ASSERT_TRUE(clients.empty());
diff --git a/vehicle/2.0/default/tests/VehicleHalManager_test.cpp b/vehicle/2.0/default/tests/VehicleHalManager_test.cpp
index dc32252..c20ab7f 100644
--- a/vehicle/2.0/default/tests/VehicleHalManager_test.cpp
+++ b/vehicle/2.0/default/tests/VehicleHalManager_test.cpp
@@ -52,7 +52,7 @@
              StatusCode* outStatus) override {
         *outStatus = StatusCode::OK;
         VehiclePropValuePtr pValue;
-        VehicleProperty property = requestedPropValue.prop;
+        auto property = static_cast<VehicleProperty>(requestedPropValue.prop);
         int32_t areaId = requestedPropValue.areaId;
 
         switch (property) {
@@ -76,7 +76,7 @@
                 pValue->value.stringValue = kCarMake;
                 break;
             default:
-                auto key = makeKey(property, areaId);
+                auto key = makeKey(toInt(property), areaId);
                 if (mValues.count(key) == 0) {
                     ALOGW("");
                 }
@@ -84,7 +84,7 @@
         }
 
         if (*outStatus == StatusCode::OK && pValue.get() != nullptr) {
-            pValue->prop = property;
+            pValue->prop = toInt(property);
             pValue->areaId = areaId;
             pValue->timestamp = elapsedRealtimeNano();
         }
@@ -93,7 +93,7 @@
     }
 
     StatusCode set(const VehiclePropValue& propValue) override {
-        if (VehicleProperty::MIRROR_FOLD == propValue.prop
+        if (toInt(VehicleProperty::MIRROR_FOLD) == propValue.prop
                 && mirrorFoldAttemptsLeft-- > 0) {
             return StatusCode::TRY_AGAIN;
         }
@@ -102,13 +102,13 @@
         return StatusCode::OK;
     }
 
-    StatusCode subscribe(VehicleProperty property,
-                       int32_t areas,
-                       float sampleRate) override {
+    StatusCode subscribe(int32_t property,
+                         int32_t areas,
+                         float sampleRate) override {
         return StatusCode::OK;
     }
 
-    StatusCode unsubscribe(VehicleProperty property) override {
+    StatusCode unsubscribe(int32_t property) override {
         return StatusCode::OK;
     }
 
@@ -116,8 +116,7 @@
         doHalEvent(std::move(value));
     }
 
-    void sendHalError(StatusCode error, VehicleProperty property,
-                      int32_t areaId) {
+    void sendHalError(StatusCode error, int32_t property, int32_t areaId) {
         doHalPropertySetError(error, property, areaId);
     }
 
@@ -130,7 +129,7 @@
         return makeKey(v.prop, v.areaId);
     }
 
-    int64_t makeKey(VehicleProperty prop, int32_t area) const {
+    int64_t makeKey(int32_t prop, int32_t area) const {
         return (static_cast<int64_t>(prop) << 32) | area;
     }
 
@@ -153,7 +152,7 @@
         hal.reset(nullptr);
     }
 public:
-    void invokeGet(VehicleProperty property, int32_t areaId) {
+    void invokeGet(int32_t property, int32_t areaId) {
         VehiclePropValue requestedValue {};
         requestedValue.prop = property;
         requestedValue.areaId = areaId;
@@ -174,7 +173,7 @@
             called = true;
         });
         ASSERT_TRUE(called) << "callback wasn't called for prop: "
-                            << enumToHexString(requestedPropValue.prop);
+                            << hexString(requestedPropValue.prop);
 
         actualValue = refValue;
         actualStatusCode = refStatus;
@@ -190,8 +189,9 @@
 };
 
 TEST_F(VehicleHalManagerTest, getPropConfigs) {
-    hidl_vec<VehicleProperty> properties =
-        { VehicleProperty::HVAC_FAN_SPEED, VehicleProperty::INFO_MAKE };
+    hidl_vec<int32_t> properties =
+        { toInt(VehicleProperty::HVAC_FAN_SPEED),
+          toInt(VehicleProperty::INFO_MAKE) };
     bool called = false;
 
     manager->getPropConfigs(properties,
@@ -205,7 +205,7 @@
     ASSERT_TRUE(called);  // Verify callback received.
 
     called = false;
-    manager->getPropConfigs({ VehicleProperty::HVAC_FAN_SPEED },
+    manager->getPropConfigs({ toInt(VehicleProperty::HVAC_FAN_SPEED) },
             [&called] (StatusCode status,
                        const hidl_vec<VehiclePropConfig>& c) {
         ASSERT_EQ(StatusCode::OK, status);
@@ -234,7 +234,7 @@
 }
 
 TEST_F(VehicleHalManagerTest, halErrorEvent) {
-    const VehicleProperty PROP = VehicleProperty::DISPLAY_BRIGHTNESS;
+    const auto PROP = toInt(VehicleProperty::DISPLAY_BRIGHTNESS);
 
     sp<MockedVehicleCallback> cb = new MockedVehicleCallback();
 
@@ -252,7 +252,7 @@
 }
 
 TEST_F(VehicleHalManagerTest, subscribe) {
-    const VehicleProperty PROP = VehicleProperty::DISPLAY_BRIGHTNESS;
+    const auto PROP = toInt(VehicleProperty::DISPLAY_BRIGHTNESS);
 
     sp<MockedVehicleCallback> cb = new MockedVehicleCallback();
 
@@ -267,7 +267,7 @@
     ASSERT_EQ(StatusCode::OK, res);
 
     auto unsubscribedValue = objectPool->obtain(VehiclePropertyType::INT32);
-    unsubscribedValue->prop = VehicleProperty::HVAC_FAN_SPEED;
+    unsubscribedValue->prop = toInt(VehicleProperty::HVAC_FAN_SPEED);
 
     hal->sendPropEvent(std::move(unsubscribedValue));
     auto& receivedEnvents = cb->getReceivedEvents();
@@ -293,7 +293,7 @@
 }
 
 TEST_F(VehicleHalManagerTest, subscribe_WriteOnly) {
-    const VehicleProperty PROP = VehicleProperty::HVAC_SEAT_TEMPERATURE;
+    const auto PROP = toInt(VehicleProperty::HVAC_SEAT_TEMPERATURE);
 
     sp<MockedVehicleCallback> cb = new MockedVehicleCallback();
 
@@ -317,10 +317,10 @@
 }
 
 TEST_F(VehicleHalManagerTest, get_Complex) {
-    invokeGet(VehicleProperty::VEHICLE_MAP_SERVICE, 0);
+    invokeGet(toInt(VehicleProperty::VEHICLE_MAP_SERVICE), 0);
 
     ASSERT_EQ(StatusCode::OK, actualStatusCode);
-    ASSERT_EQ(VehicleProperty::VEHICLE_MAP_SERVICE, actualValue.prop);
+    ASSERT_EQ(toInt(VehicleProperty::VEHICLE_MAP_SERVICE), actualValue.prop);
 
     ASSERT_EQ(3, actualValue.value.bytes.size());
     ASSERT_EQ(1, actualValue.value.bytes[0]);
@@ -343,20 +343,20 @@
 }
 
 TEST_F(VehicleHalManagerTest, get_StaticString) {
-    invokeGet(VehicleProperty::INFO_MAKE, 0);
+    invokeGet(toInt(VehicleProperty::INFO_MAKE), 0);
 
     ASSERT_EQ(StatusCode::OK, actualStatusCode);
-    ASSERT_EQ(VehicleProperty::INFO_MAKE, actualValue.prop);
+    ASSERT_EQ(toInt(VehicleProperty::INFO_MAKE), actualValue.prop);
     ASSERT_STREQ(kCarMake, actualValue.value.stringValue.c_str());
 }
 
 TEST_F(VehicleHalManagerTest, get_NegativeCases) {
     // Write-only property must fail.
-    invokeGet(VehicleProperty::HVAC_SEAT_TEMPERATURE, 0);
+    invokeGet(toInt(VehicleProperty::HVAC_SEAT_TEMPERATURE), 0);
     ASSERT_EQ(StatusCode::ACCESS_DENIED, actualStatusCode);
 
     // Unknown property must fail.
-    invokeGet(VehicleProperty::MIRROR_Z_MOVE, 0);
+    invokeGet(toInt(VehicleProperty::MIRROR_Z_MOVE), 0);
     ASSERT_EQ(StatusCode::INVALID_ARG, actualStatusCode);
 }
 
@@ -364,7 +364,7 @@
     actualStatusCode = StatusCode::TRY_AGAIN;
     int attempts = 0;
     while (StatusCode::TRY_AGAIN == actualStatusCode && ++attempts < 10) {
-        invokeGet(VehicleProperty::INFO_FUEL_CAPACITY, 0);
+        invokeGet(toInt(VehicleProperty::INFO_FUEL_CAPACITY), 0);
 
     }
     ASSERT_EQ(StatusCode::OK, actualStatusCode);
@@ -373,7 +373,7 @@
 }
 
 TEST_F(VehicleHalManagerTest, set_Basic) {
-    const auto PROP = VehicleProperty::DISPLAY_BRIGHTNESS;
+    const auto PROP = toInt(VehicleProperty::DISPLAY_BRIGHTNESS);
     const auto VAL = 7;
 
     auto expectedValue = hal->getValuePool()->obtainInt32(VAL);
@@ -390,7 +390,7 @@
 }
 
 TEST_F(VehicleHalManagerTest, set_DifferentAreas) {
-    const auto PROP = VehicleProperty::HVAC_FAN_SPEED;
+    const auto PROP = toInt(VehicleProperty::HVAC_FAN_SPEED);
     const auto VAL1 = 1;
     const auto VAL2 = 2;
     const auto AREA1 = toInt(VehicleAreaZone::ROW_1_LEFT);
@@ -426,7 +426,7 @@
 }
 
 TEST_F(VehicleHalManagerTest, set_Retriable) {
-    const auto PROP = VehicleProperty::MIRROR_FOLD;
+    const auto PROP = toInt(VehicleProperty::MIRROR_FOLD);
 
     auto v = hal->getValuePool()->obtainBoolean(true);
     v->prop = PROP;
diff --git a/vehicle/2.0/default/tests/VehicleHalTestUtils.h b/vehicle/2.0/default/tests/VehicleHalTestUtils.h
index 538c022..fab420a 100644
--- a/vehicle/2.0/default/tests/VehicleHalTestUtils.h
+++ b/vehicle/2.0/default/tests/VehicleHalTestUtils.h
@@ -29,14 +29,14 @@
 
 const VehiclePropConfig kVehicleProperties[] = {
     {
-        .prop = VehicleProperty::INFO_MAKE,
+        .prop = toInt(VehicleProperty::INFO_MAKE),
         .access = VehiclePropertyAccess::READ,
         .changeMode = VehiclePropertyChangeMode::STATIC,
         .configString = "Some=config,options=if,you=have_any",
     },
 
     {
-        .prop = VehicleProperty::HVAC_FAN_SPEED,
+        .prop = toInt(VehicleProperty::HVAC_FAN_SPEED),
         .access = VehiclePropertyAccess::READ_WRITE,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
         .supportedAreas = static_cast<int32_t>(
@@ -56,7 +56,7 @@
 
     // Write-only property
     {
-        .prop = VehicleProperty::HVAC_SEAT_TEMPERATURE,
+        .prop = toInt(VehicleProperty::HVAC_SEAT_TEMPERATURE),
         .access = VehiclePropertyAccess::WRITE,
         .changeMode = VehiclePropertyChangeMode::ON_SET,
         .supportedAreas = static_cast<int32_t>(
@@ -75,7 +75,7 @@
     },
 
     {
-        .prop = VehicleProperty::INFO_FUEL_CAPACITY,
+        .prop = toInt(VehicleProperty::INFO_FUEL_CAPACITY),
         .access = VehiclePropertyAccess::READ,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
         .areaConfigs = {
@@ -87,7 +87,7 @@
     },
 
     {
-        .prop = VehicleProperty::DISPLAY_BRIGHTNESS,
+        .prop = toInt(VehicleProperty::DISPLAY_BRIGHTNESS),
         .access = VehiclePropertyAccess::READ_WRITE,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
         .areaConfigs = {
@@ -99,7 +99,7 @@
     },
 
     {
-        .prop = VehicleProperty::MIRROR_FOLD,
+        .prop = toInt(VehicleProperty::MIRROR_FOLD),
         .access = VehiclePropertyAccess::READ_WRITE,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
 
@@ -107,7 +107,7 @@
 
     // Complex data type.
     {
-        .prop = VehicleProperty::VEHICLE_MAP_SERVICE,
+        .prop = toInt(VehicleProperty::VEHICLE_MAP_SERVICE),
         .access = VehiclePropertyAccess::READ_WRITE,
         .changeMode = VehiclePropertyChangeMode::ON_CHANGE
     }
@@ -134,7 +134,7 @@
         return Return<void>();
     }
     Return<void> onPropertySetError(StatusCode errorCode,
-                                    VehicleProperty propId,
+                                    int32_t propId,
                                     int32_t areaId) override {
         return Return<void>();
     }
@@ -218,7 +218,7 @@
 inline std::string toString(const VehiclePropValue &v) {
     std::stringstream ss;
     ss << "VehiclePropValue {n"
-       << "  prop: " << enumToHexString(v.prop) << ",\n"
+       << "  prop: " << hexString(v.prop) << ",\n"
        << "  areaId: " << hexString(v.areaId) << ",\n"
        << "  timestamp: " << v.timestamp << ",\n"
        << "  value {\n"
@@ -236,7 +236,7 @@
 inline std::string toString(const VehiclePropConfig &config) {
     std::stringstream ss;
     ss << "VehiclePropConfig {\n"
-       << "  prop: " << enumToHexString(config.prop) << ",\n"
+       << "  prop: " << hexString(config.prop) << ",\n"
        << "  supportedAreas: " << hexString(config.supportedAreas) << ",\n"
        << "  access: " << enumToHexString(config.access) << ",\n"
        << "  changeMode: " << enumToHexString(config.changeMode) << ",\n"
diff --git a/vehicle/2.0/default/tests/VehiclePropConfigIndex_test.cpp b/vehicle/2.0/default/tests/VehiclePropConfigIndex_test.cpp
index 28cdcbb..4e1daf8 100644
--- a/vehicle/2.0/default/tests/VehiclePropConfigIndex_test.cpp
+++ b/vehicle/2.0/default/tests/VehiclePropConfigIndex_test.cpp
@@ -43,11 +43,11 @@
 TEST_F(PropConfigTest, hasConfig) {
     VehiclePropConfigIndex index(configs);
 
-    ASSERT_TRUE(index.hasConfig(VehicleProperty::HVAC_FAN_SPEED));
-    ASSERT_TRUE(index.hasConfig(VehicleProperty::INFO_MAKE));
-    ASSERT_TRUE(index.hasConfig(VehicleProperty::INFO_FUEL_CAPACITY));
+    ASSERT_TRUE(index.hasConfig(toInt(VehicleProperty::HVAC_FAN_SPEED)));
+    ASSERT_TRUE(index.hasConfig(toInt(VehicleProperty::INFO_MAKE)));
+    ASSERT_TRUE(index.hasConfig(toInt(VehicleProperty::INFO_FUEL_CAPACITY)));
 
-    ASSERT_FALSE(index.hasConfig(VehicleProperty::INVALID));
+    ASSERT_FALSE(index.hasConfig(toInt(VehicleProperty::INVALID)));
 }
 
 TEST_F(PropConfigTest, getAllConfig) {
@@ -63,7 +63,7 @@
 
 TEST_F(PropConfigTest, getConfigs) {
     VehiclePropConfigIndex index(configs);
-    auto actualConfig = index.getConfig(VehicleProperty::HVAC_FAN_SPEED);
+    auto actualConfig = index.getConfig(toInt(VehicleProperty::HVAC_FAN_SPEED));
     ASSERT_EQ(toString(configs[1]), toString(actualConfig));
 }
 
diff --git a/vehicle/2.0/default/vehicle_hal_manager/AccessControlConfigParser.cpp b/vehicle/2.0/default/vehicle_hal_manager/AccessControlConfigParser.cpp
index 063a16d..9cc994d 100644
--- a/vehicle/2.0/default/vehicle_hal_manager/AccessControlConfigParser.cpp
+++ b/vehicle/2.0/default/vehicle_hal_manager/AccessControlConfigParser.cpp
@@ -17,6 +17,7 @@
 #define LOG_TAG "android.hardware.vehicle@2.0-impl"
 
 #include "AccessControlConfigParser.h"
+#include "VehicleUtils.h"
 
 #include <fstream>
 #include <iostream>
@@ -30,17 +31,17 @@
 namespace V2_0 {
 
 AccessControlConfigParser::AccessControlConfigParser(
-        const std::vector<VehicleProperty>& properties) {
+        const std::vector<int32_t>& properties) {
     // Property Id in the config file doesn't include information about
     // type and area. So we want to create a map from these kind of
     // *stripped* properties to the whole VehicleProperty.
     // We also want to filter out ACL to the properties that supported
     // by concrete Vehicle HAL implementation.
-    for (VehicleProperty vehicleProperty : properties) {
-        auto numProp = static_cast<int>(vehicleProperty);
-        numProp &= ~static_cast<int>(VehiclePropertyType::MASK)
-                & ~static_cast<int>(VehicleArea::MASK);
-        mStrippedToVehiclePropertyMap.emplace(numProp, vehicleProperty);
+    for (auto prop : properties) {
+        auto strippedProp = prop
+                            & ~toInt(VehiclePropertyType::MASK)
+                            & ~toInt(VehicleArea::MASK);
+        mStrippedToVehiclePropertyMap.emplace(strippedProp, prop);
     }
 }
 
@@ -130,8 +131,8 @@
 bool AccessControlConfigParser::parsePropertyId(
         const std::string& strPropId,
         VehiclePropertyGroup propertyGroup,
-        VehicleProperty* outVehicleProperty) const {
-    int propId;
+        int32_t* outVehicleProperty) const {
+    int32_t propId;
     if (!parseInt(strPropId.c_str(), &propId)) {
         ALOGW("Failed to convert property id to integer: %s",
               strPropId.c_str());
diff --git a/vehicle/2.0/default/vehicle_hal_manager/AccessControlConfigParser.h b/vehicle/2.0/default/vehicle_hal_manager/AccessControlConfigParser.h
index 5cd0c3e..0c3753f 100644
--- a/vehicle/2.0/default/vehicle_hal_manager/AccessControlConfigParser.h
+++ b/vehicle/2.0/default/vehicle_hal_manager/AccessControlConfigParser.h
@@ -30,12 +30,12 @@
 namespace V2_0 {
 
 struct PropertyAcl {
-    VehicleProperty propId;
+    int32_t propId;
     unsigned uid;
     VehiclePropertyAccess access;
 };
 
-using PropertyAclMap = std::unordered_multimap<VehicleProperty, PropertyAcl>;
+using PropertyAclMap = std::unordered_multimap<int32_t, PropertyAcl>;
 
 /**
  * Parser for per-property access control in vehicle HAL.
@@ -64,7 +64,7 @@
      *
      * @param properties - properties supported by HAL implementation
      */
-    AccessControlConfigParser(const std::vector<VehicleProperty>& properties);
+    AccessControlConfigParser(const std::vector<int32_t>& properties);
 
     /**
      * Parses config content from given stream and writes results to
@@ -81,7 +81,7 @@
 
     bool parsePropertyId(const std::string& strPropId,
                                 VehiclePropertyGroup propertyGroup,
-                                VehicleProperty* outVehicleProperty) const;
+                                int32_t* outVehicleProperty) const;
 
     bool parseUid(const std::string& strUid, unsigned* outUid) const;
 
@@ -100,7 +100,7 @@
     // aliases.
 
     // Map property ids w/o TYPE and AREA to VehicleProperty.
-    std::unordered_map<int, VehicleProperty> mStrippedToVehiclePropertyMap;
+    std::unordered_map<int32_t, int32_t> mStrippedToVehiclePropertyMap;
 };
 
 }  // namespace V2_0
diff --git a/vehicle/2.0/default/vehicle_hal_manager/SubscriptionManager.cpp b/vehicle/2.0/default/vehicle_hal_manager/SubscriptionManager.cpp
index c190c71..72b0a83 100644
--- a/vehicle/2.0/default/vehicle_hal_manager/SubscriptionManager.cpp
+++ b/vehicle/2.0/default/vehicle_hal_manager/SubscriptionManager.cpp
@@ -70,7 +70,9 @@
     }
 }
 
-bool HalClient::isSubscribed(VehicleProperty propId, int32_t areaId, SubscribeFlags flags) {
+bool HalClient::isSubscribed(int32_t propId,
+                             int32_t areaId,
+                             SubscribeFlags flags) {
     auto it = mSubscriptions.find(propId);
     if (it == mSubscriptions.end()) {
         return false;
@@ -136,13 +138,13 @@
 }
 
 std::list<sp<HalClient>> SubscriptionManager::getSubscribedClients(
-    VehicleProperty propId, int32_t area, SubscribeFlags flags) const {
+    int32_t propId, int32_t area, SubscribeFlags flags) const {
     MuxGuard g(mLock);
     return getSubscribedClientsLocked(propId, area, flags);
 }
 
 std::list<sp<HalClient>> SubscriptionManager::getSubscribedClientsLocked(
-        VehicleProperty propId, int32_t area, SubscribeFlags flags) const {
+        int32_t propId, int32_t area, SubscribeFlags flags) const {
     std::list<sp<HalClient>> subscribedClients;
 
     sp<HalClientVector> propClients = getClientsForPropertyLocked(propId);
@@ -180,7 +182,7 @@
 }
 
 void SubscriptionManager::addClientToPropMapLocked(
-        VehicleProperty propId, const sp<HalClient> &client) {
+        int32_t propId, const sp<HalClient> &client) {
     auto it = mPropToClients.find(propId);
     sp<HalClientVector> propClients;
     if (it == mPropToClients.end()) {
@@ -193,7 +195,7 @@
 }
 
 sp<HalClientVector> SubscriptionManager::getClientsForPropertyLocked(
-        VehicleProperty propId) const {
+        int32_t propId) const {
     auto it = mPropToClients.find(propId);
     return it == mPropToClients.end() ? nullptr : it->second;
 }
@@ -214,7 +216,7 @@
 }
 
 bool SubscriptionManager::unsubscribe(const sp<IVehicleCallback>& callback,
-                                      VehicleProperty propId) {
+                                      int32_t propId) {
     MuxGuard g(mLock);
     auto propertyClients = getClientsForPropertyLocked(propId);
     auto clientIter = mClients.find(callback);
diff --git a/vehicle/2.0/default/vehicle_hal_manager/SubscriptionManager.h b/vehicle/2.0/default/vehicle_hal_manager/SubscriptionManager.h
index 9f2ed8d..7a74295 100644
--- a/vehicle/2.0/default/vehicle_hal_manager/SubscriptionManager.h
+++ b/vehicle/2.0/default/vehicle_hal_manager/SubscriptionManager.h
@@ -50,7 +50,7 @@
 
     void addOrUpdateSubscription(const SubscribeOptions &opts);
 
-    bool isSubscribed(VehicleProperty propId,
+    bool isSubscribed(int32_t propId,
                       int32_t areaId,
                       SubscribeFlags flags);
 
@@ -59,7 +59,7 @@
     const int32_t mPid;
     const int32_t mUid;
 
-    std::map<VehicleProperty, SubscribeOptions> mSubscriptions;
+    std::map<int32_t, SubscribeOptions> mSubscriptions;
 };
 
 class HalClientVector : private SortedVector<sp<HalClient>> , public RefBase {
@@ -103,26 +103,26 @@
             SubscribeFlags flags) const;
 
     std::list<sp<HalClient>> getSubscribedClients(
-        VehicleProperty propId, int32_t area, SubscribeFlags flags) const;
+        int32_t propId, int32_t area, SubscribeFlags flags) const;
 
     /**
      * Returns true the client was unsubscribed successfully and there are
      * no more clients subscribed to given propId.
      */
     bool unsubscribe(const sp<IVehicleCallback>& callback,
-                     VehicleProperty propId);
+                     int32_t propId);
 private:
     std::list<sp< HalClient>> getSubscribedClientsLocked(
-            VehicleProperty propId, int32_t area, SubscribeFlags flags) const;
+            int32_t propId, int32_t area, SubscribeFlags flags) const;
 
     bool updateHalEventSubscriptionLocked(const SubscribeOptions &opts,
                                           SubscribeOptions *out);
 
-    void addClientToPropMapLocked(VehicleProperty propId,
+    void addClientToPropMapLocked(int32_t propId,
                                   const sp<HalClient> &client);
 
     sp<HalClientVector> getClientsForPropertyLocked(
-            VehicleProperty propId) const;
+            int32_t propId) const;
 
     sp<HalClient> getOrCreateHalClientLocked(
             const sp<IVehicleCallback> &callback);
@@ -133,8 +133,8 @@
     mutable std::mutex mLock;
 
     std::map<sp<IVehicleCallback>, sp<HalClient>> mClients;
-    std::map<VehicleProperty, sp<HalClientVector>> mPropToClients;
-    std::map<VehicleProperty, SubscribeOptions> mHalEventSubscribeOptions;
+    std::map<int32_t, sp<HalClientVector>> mPropToClients;
+    std::map<int32_t, SubscribeOptions> mHalEventSubscribeOptions;
 };
 
 
diff --git a/vehicle/2.0/default/vehicle_hal_manager/VehicleHalManager.cpp b/vehicle/2.0/default/vehicle_hal_manager/VehicleHalManager.cpp
index 5d2e6fe..8b243a3 100644
--- a/vehicle/2.0/default/vehicle_hal_manager/VehicleHalManager.cpp
+++ b/vehicle/2.0/default/vehicle_hal_manager/VehicleHalManager.cpp
@@ -58,11 +58,11 @@
 }
 
 Return<void> VehicleHalManager::getPropConfigs(
-        const hidl_vec<VehicleProperty> &properties,
+        const hidl_vec<int32_t> &properties,
         getPropConfigs_cb _hidl_cb) {
     std::vector<VehiclePropConfig> configs;
     for (size_t i = 0; i < properties.size(); i++) {
-        VehicleProperty prop = properties[i];
+        auto prop = properties[i];
         if (mConfigIndex->hasConfig(prop)) {
             configs.push_back(mConfigIndex->getConfig(prop));
         } else {
@@ -125,7 +125,7 @@
     auto caller = getCaller();
     for (size_t i = 0; i < verifiedOptions.size(); i++) {
         SubscribeOptions& ops = verifiedOptions[i];
-        VehicleProperty prop = ops.propId;
+        auto prop = ops.propId;
 
         const auto* config = getPropConfigOrNull(prop);
         if (config == nullptr) {
@@ -168,7 +168,7 @@
 }
 
 Return<StatusCode> VehicleHalManager::unsubscribe(
-        const sp<IVehicleCallback>& callback, VehicleProperty propId) {
+        const sp<IVehicleCallback>& callback, int32_t propId) {
     if (mSubscriptionManager.unsubscribe(callback, propId)) {
         mHal->unsubscribe(propId);
     }
@@ -200,7 +200,7 @@
     auto supportedPropConfigs = mHal->listProperties();
     mConfigIndex.reset(new VehiclePropConfigIndex(supportedPropConfigs));
 
-    std::vector<VehicleProperty> supportedProperties(
+    std::vector<int32_t> supportedProperties(
         supportedPropConfigs.size());
     for (const auto& config : supportedPropConfigs) {
         supportedProperties.push_back(config.prop);
@@ -228,7 +228,7 @@
 }
 
 void VehicleHalManager::onHalPropertySetError(StatusCode errorCode,
-                                              VehicleProperty property,
+                                              int32_t property,
                                               int32_t areaId) {
     const auto& clients = mSubscriptionManager.getSubscribedClients(
             property, 0, SubscribeFlags::HAL_EVENT);
@@ -309,7 +309,7 @@
     return true;
 }
 
-bool VehicleHalManager::checkAcl(uid_t callerUid, VehicleProperty propertyId,
+bool VehicleHalManager::checkAcl(uid_t callerUid, int32_t propertyId,
                                  VehiclePropertyAccess requiredAccess) const {
     if (callerUid == AID_SYSTEM && isSystemProperty(propertyId)) {
         return true;
@@ -353,7 +353,7 @@
 }
 
 const VehiclePropConfig* VehicleHalManager::getPropConfigOrNull(
-        VehicleProperty prop) const {
+        int32_t prop) const {
     return mConfigIndex->hasConfig(prop)
            ? &mConfigIndex->getConfig(prop) : nullptr;
 }
diff --git a/vehicle/2.0/default/vehicle_hal_manager/VehicleHalManager.h b/vehicle/2.0/default/vehicle_hal_manager/VehicleHalManager.h
index 6768741..49723da 100644
--- a/vehicle/2.0/default/vehicle_hal_manager/VehicleHalManager.h
+++ b/vehicle/2.0/default/vehicle_hal_manager/VehicleHalManager.h
@@ -66,7 +66,7 @@
     // ---------------------------------------------------------------------------------------------
     // Methods derived from IVehicle
     Return<void> getAllPropConfigs(getAllPropConfigs_cb _hidl_cb)  override;
-    Return<void> getPropConfigs(const hidl_vec<VehicleProperty>& properties,
+    Return<void> getPropConfigs(const hidl_vec<int32_t>& properties,
                                 getPropConfigs_cb _hidl_cb)  override;
     Return<void> get(const VehiclePropValue& requestedPropValue,
                      get_cb _hidl_cb)  override;
@@ -74,7 +74,7 @@
     Return<StatusCode> subscribe(const sp<IVehicleCallback>& callback,
                                 const hidl_vec<SubscribeOptions>& options)  override;
     Return<StatusCode> unsubscribe(const sp<IVehicleCallback>& callback,
-                                   VehicleProperty propId)  override;
+                                   int32_t propId)  override;
     Return<void> debugDump(debugDump_cb _hidl_cb = nullptr) override;
 
 private:
@@ -85,7 +85,7 @@
     // ---------------------------------------------------------------------------------------------
     // Events received from VehicleHal
     void onHalEvent(VehiclePropValuePtr  v);
-    void onHalPropertySetError(StatusCode errorCode, VehicleProperty property,
+    void onHalPropertySetError(StatusCode errorCode, int32_t property,
                                int32_t areaId);
 
     // ---------------------------------------------------------------------------------------------
@@ -94,14 +94,14 @@
 
     void handlePropertySetEvent(const VehiclePropValue& value);
 
-    const VehiclePropConfig* getPropConfigOrNull(VehicleProperty prop) const;
+    const VehiclePropConfig* getPropConfigOrNull(int32_t prop) const;
 
     bool checkWritePermission(const VehiclePropConfig &config,
                               const Caller& callee) const;
     bool checkReadPermission(const VehiclePropConfig &config,
                              const Caller& caller) const;
     bool checkAcl(uid_t callerUid,
-                  VehicleProperty propertyId,
+                  int32_t propertyId,
                   VehiclePropertyAccess requiredAccess) const;
 
     static bool isSubscribable(const VehiclePropConfig& config,
diff --git a/vehicle/2.0/default/vehicle_hal_manager/VehicleObjectPool.cpp b/vehicle/2.0/default/vehicle_hal_manager/VehicleObjectPool.cpp
index e9dd68d..5fa77b1 100644
--- a/vehicle/2.0/default/vehicle_hal_manager/VehicleObjectPool.cpp
+++ b/vehicle/2.0/default/vehicle_hal_manager/VehicleObjectPool.cpp
@@ -36,7 +36,7 @@
 
 VehiclePropValuePool::RecyclableType VehiclePropValuePool::obtain(
         const VehiclePropValue& src) {
-    if (src.prop == VehicleProperty::INVALID) {
+    if (src.prop == toInt(VehicleProperty::INVALID)) {
         ALOGE("Unable to obtain an object from pool for unknown property");
         return RecyclableType();
     }
diff --git a/vehicle/2.0/default/vehicle_hal_manager/VehiclePropConfigIndex.h b/vehicle/2.0/default/vehicle_hal_manager/VehiclePropConfigIndex.h
index 540fc33..a08ac42 100644
--- a/vehicle/2.0/default/vehicle_hal_manager/VehiclePropConfigIndex.h
+++ b/vehicle/2.0/default/vehicle_hal_manager/VehiclePropConfigIndex.h
@@ -37,11 +37,11 @@
         : mConfigs(properties), mPropToConfig(mConfigs)
     {}
 
-    bool hasConfig(VehicleProperty property) const {
+    bool hasConfig(int32_t property) const {
         return mPropToConfig.indexOfKey(property) >= 0;
     }
 
-    const VehiclePropConfig& getConfig(VehicleProperty property) const {
+    const VehiclePropConfig& getConfig(int32_t property) const {
         return *mPropToConfig.valueFor(property);
     }
 
@@ -50,7 +50,7 @@
     }
 
 private:
-    typedef KeyedVector<VehicleProperty, const VehiclePropConfig*> PropConfigMap;
+    typedef KeyedVector<int32_t, const VehiclePropConfig*> PropConfigMap;
     class ImmutablePropConfigMap : private PropConfigMap {
     public:
         ImmutablePropConfigMap(const std::vector<VehiclePropConfig>& configs) {
diff --git a/vehicle/2.0/default/vehicle_hal_manager/VehicleUtils.h b/vehicle/2.0/default/vehicle_hal_manager/VehicleUtils.h
index 1177ddd..c24d860 100644
--- a/vehicle/2.0/default/vehicle_hal_manager/VehicleUtils.h
+++ b/vehicle/2.0/default/vehicle_hal_manager/VehicleUtils.h
@@ -33,32 +33,30 @@
 
 /** Returns underlying (integer) value for given enum. */
 template<typename ENUM>
-inline typename std::underlying_type<ENUM>::type toInt(ENUM const value) {
+inline constexpr typename std::underlying_type<ENUM>::type toInt(
+        ENUM const value) {
     return static_cast<typename std::underlying_type<ENUM>::type>(value);
 }
 
-inline VehiclePropertyType getPropType(VehicleProperty prop) {
+inline constexpr VehiclePropertyType getPropType(int32_t prop) {
     return static_cast<VehiclePropertyType>(
-        static_cast<int32_t>(prop)
-        & static_cast<int32_t>(VehiclePropertyType::MASK));
+            prop & toInt(VehiclePropertyType::MASK));
 }
 
-inline VehiclePropertyGroup getPropGroup(VehicleProperty prop) {
+inline constexpr VehiclePropertyGroup getPropGroup(int32_t prop) {
     return static_cast<VehiclePropertyGroup>(
-        static_cast<int32_t>(prop)
-        & static_cast<int32_t>(VehiclePropertyGroup::MASK));
+            prop & toInt(VehiclePropertyGroup::MASK));
 }
 
-inline VehicleArea getPropArea(VehicleProperty prop) {
-    return static_cast<VehicleArea>(
-        static_cast<int32_t>(prop) & static_cast<int32_t>(VehicleArea::MASK));
+inline constexpr VehicleArea getPropArea(int32_t prop) {
+    return static_cast<VehicleArea>(prop & toInt(VehicleArea::MASK));
 }
 
-inline bool isGlobalProp(VehicleProperty prop) {
+inline constexpr bool isGlobalProp(int32_t prop) {
     return getPropArea(prop) == VehicleArea::GLOBAL;
 }
 
-inline bool isSystemProperty(VehicleProperty prop) {
+inline constexpr bool isSystemProperty(int32_t prop) {
     return VehiclePropertyGroup::SYSTEM == getPropGroup(prop);
 }
 
diff --git a/vehicle/2.0/types.hal b/vehicle/2.0/types.hal
index 9fda4fd..e1e4453 100644
--- a/vehicle/2.0/types.hal
+++ b/vehicle/2.0/types.hal
@@ -2488,7 +2488,8 @@
 };
 
 struct VehiclePropConfig {
-    VehicleProperty prop;
+    /* Property identifier */
+    int32_t prop;
 
     /*
      * Defines if the property is read or write or both.
@@ -2549,7 +2550,7 @@
  */
 struct VehiclePropValue {
     /* Property identifier */
-    VehicleProperty prop;
+    int32_t prop;
 
     /* Time is elapsed nanoseconds since boot */
     int64_t timestamp;
@@ -2669,7 +2670,7 @@
  */
 struct SubscribeOptions {
   /* Property to subscribe */
-  VehicleProperty propId;
+  int32_t propId;
 
   /*
    * Area ids - this must be a bit mask of areas to subscribe or 0 to subscribe