diff --git a/automotive/remoteaccess/hal/default/Android.bp b/automotive/remoteaccess/hal/default/Android.bp
index 97ed2c1..be6a425 100644
--- a/automotive/remoteaccess/hal/default/Android.bp
+++ b/automotive/remoteaccess/hal/default/Android.bp
@@ -53,7 +53,9 @@
     vintf_fragments: ["remoteaccess-default-service.xml"],
     init_rc: ["remoteaccess-default-service.rc"],
     cflags: [
-        "-DGRPC_SERVICE_ADDRESS=\"10.0.2.2:50051\"",
+        // Uncomment this if running on emulator and connecting to a local grpc server
+        // running on host 127.0.0.1:50051 (TestWakeupClientServerHost)
+        // "-DGRPC_SERVICE_ADDRESS=\"10.0.2.2:50051\"",
     ],
 }
 
diff --git a/automotive/remoteaccess/hal/default/include/RemoteAccessService.h b/automotive/remoteaccess/hal/default/include/RemoteAccessService.h
index 6266de8..8716e48 100644
--- a/automotive/remoteaccess/hal/default/include/RemoteAccessService.h
+++ b/automotive/remoteaccess/hal/default/include/RemoteAccessService.h
@@ -111,6 +111,8 @@
 
     WakeupClient::StubInterface* mGrpcStub;
     std::thread mThread;
+    // Whether the GRPC server exists. Only checked and set during init.
+    bool mGrpcServerExist = false;
     std::mutex mLock;
     std::condition_variable mCv;
     std::shared_ptr<aidl::android::hardware::automotive::remoteaccess::IRemoteTaskCallback>
@@ -121,7 +123,7 @@
     // A mutex to make sure startTaskLoop does not overlap with stopTaskLoop.
     std::mutex mStartStopTaskLoopLock;
     bool mTaskLoopRunning GUARDED_BY(mStartStopTaskLoopLock) = false;
-    bool mGrpcConnected GUARDED_BY(mLock) = false;
+    bool mGrpcReadChannelOpen GUARDED_BY(mLock) = false;
     std::unordered_map<std::string, size_t> mClientIdToTaskCount GUARDED_BY(mLock);
 
     // Default wait time before retry connecting to remote access client is 10s.
@@ -143,9 +145,10 @@
     void debugInjectTask(int fd, std::string_view clientId, std::string_view taskData);
     void debugInjectTaskNextReboot(int fd, std::string_view clientId, std::string_view taskData,
                                    const char* latencyInSecStr);
-    void updateGrpcConnected(bool connected);
+    void updateGrpcReadChannelOpen(bool grpcReadChannelOpen);
     android::base::Result<void> deliverRemoteTaskThroughCallback(const std::string& clientId,
                                                                  std::string_view taskData);
+    bool isTaskScheduleSupported();
 };
 
 }  // namespace remoteaccess
diff --git a/automotive/remoteaccess/hal/default/src/RemoteAccessImpl.cpp b/automotive/remoteaccess/hal/default/src/RemoteAccessImpl.cpp
index d4ba864..28c5cd5 100644
--- a/automotive/remoteaccess/hal/default/src/RemoteAccessImpl.cpp
+++ b/automotive/remoteaccess/hal/default/src/RemoteAccessImpl.cpp
@@ -30,10 +30,9 @@
 constexpr char SERVICE_NAME[] = "android.hardware.automotive.remoteaccess.IRemoteAccess/default";
 
 int main(int /* argc */, char* /* argv */[]) {
-#ifndef GRPC_SERVICE_ADDRESS
-    LOG(ERROR) << "GRPC_SERVICE_ADDRESS is not defined, exiting";
-    exit(1);
-#endif
+    android::hardware::automotive::remoteaccess::WakeupClient::StubInterface* grpcStub = nullptr;
+
+#ifdef GRPC_SERVICE_ADDRESS
     LOG(INFO) << "Registering RemoteAccessService as service, server: " << GRPC_SERVICE_ADDRESS
               << "...";
     grpc::ChannelArguments grpcargs = {};
@@ -47,11 +46,18 @@
     android::netdevice::waitFor({GRPC_SERVICE_IFNAME},
                                 android::netdevice::WaitCondition::PRESENT_AND_UP);
     LOG(INFO) << "Waiting for interface: " << GRPC_SERVICE_IFNAME << " done";
-#endif
+#endif  // #ifdef GRPC_SERVICE_IFNAME
     auto channel = grpc::CreateChannel(GRPC_SERVICE_ADDRESS, grpc::InsecureChannelCredentials());
     auto clientStub = android::hardware::automotive::remoteaccess::WakeupClient::NewStub(channel);
+
+    grpcStub = clientStub.get();
+
+#else
+    LOG(INFO) << "GRPC_SERVICE_ADDRESS is not defined, work in fake mode";
+#endif  // #ifdef GRPC_SERVICE_ADDRESS
+
     auto service = ndk::SharedRefBase::make<
-            android::hardware::automotive::remoteaccess::RemoteAccessService>(clientStub.get());
+            android::hardware::automotive::remoteaccess::RemoteAccessService>(grpcStub);
 
     binder_exception_t err = AServiceManager_addService(service->asBinder().get(), SERVICE_NAME);
     if (err != EX_NONE) {
diff --git a/automotive/remoteaccess/hal/default/src/RemoteAccessService.cpp b/automotive/remoteaccess/hal/default/src/RemoteAccessService.cpp
index 1b42a1f..dbd5bed 100644
--- a/automotive/remoteaccess/hal/default/src/RemoteAccessService.cpp
+++ b/automotive/remoteaccess/hal/default/src/RemoteAccessService.cpp
@@ -103,6 +103,10 @@
 
 RemoteAccessService::RemoteAccessService(WakeupClient::StubInterface* grpcStub)
     : mGrpcStub(grpcStub) {
+    if (mGrpcStub != nullptr) {
+        mGrpcServerExist = true;
+    }
+
     std::ifstream debugTaskFile;
     debugTaskFile.open(DEBUG_TASK_FILE, std::ios::in);
     if (!debugTaskFile.is_open()) {
@@ -177,9 +181,9 @@
     mTaskLoopRunning = false;
 }
 
-void RemoteAccessService::updateGrpcConnected(bool connected) {
+void RemoteAccessService::updateGrpcReadChannelOpen(bool grpcReadChannelOpen) {
     std::lock_guard<std::mutex> lockGuard(mLock);
-    mGrpcConnected = connected;
+    mGrpcReadChannelOpen = grpcReadChannelOpen;
 }
 
 Result<void> RemoteAccessService::deliverRemoteTaskThroughCallback(const std::string& clientId,
@@ -213,7 +217,7 @@
             mGetRemoteTasksContext.reset(new ClientContext());
             reader = mGrpcStub->GetRemoteTasks(mGetRemoteTasksContext.get(), request);
         }
-        updateGrpcConnected(true);
+        updateGrpcReadChannelOpen(true);
         GetRemoteTasksResponse response;
         while (reader->Read(&response)) {
             ALOGI("Receiving one task from remote task client");
@@ -225,7 +229,7 @@
                 continue;
             }
         }
-        updateGrpcConnected(false);
+        updateGrpcReadChannelOpen(false);
         Status status = reader->Finish();
         mGetRemoteTasksContext.reset();
 
@@ -298,6 +302,11 @@
 }
 
 ScopedAStatus RemoteAccessService::notifyApStateChange(const ApState& newState) {
+    if (!mGrpcServerExist) {
+        ALOGW("GRPC server does not exist, do nothing");
+        return ScopedAStatus::ok();
+    }
+
     ClientContext context;
     NotifyWakeupRequiredRequest request = {};
     request.set_iswakeuprequired(newState.isWakeupRequired);
@@ -315,19 +324,40 @@
     return ScopedAStatus::ok();
 }
 
+bool RemoteAccessService::isTaskScheduleSupported() {
+    if (!mGrpcServerExist) {
+        ALOGW("GRPC server does not exist, task scheduling not supported");
+        return false;
+    }
+
+    return true;
+}
+
 ScopedAStatus RemoteAccessService::isTaskScheduleSupported(bool* out) {
-    *out = true;
+    *out = isTaskScheduleSupported();
     return ScopedAStatus::ok();
 }
 
 ndk::ScopedAStatus RemoteAccessService::getSupportedTaskTypesForScheduling(
         std::vector<TaskType>* out) {
+    out->clear();
+    if (!isTaskScheduleSupported()) {
+        ALOGW("Task scheduleing is not supported, return empty task types");
+        return ScopedAStatus::ok();
+    }
+
     // TODO(b/316233421): support ENTER_GARAGE_MODE type.
     out->push_back(TaskType::CUSTOM);
     return ScopedAStatus::ok();
 }
 
 ScopedAStatus RemoteAccessService::scheduleTask(const ScheduleInfo& scheduleInfo) {
+    if (!isTaskScheduleSupported()) {
+        ALOGW("Task scheduleing is not supported, return exception");
+        return ScopedAStatus::fromExceptionCodeWithMessage(EX_ILLEGAL_ARGUMENT,
+                                                           "task scheduling is not supported");
+    }
+
     ClientContext context;
     ScheduleTaskRequest request = {};
     ScheduleTaskResponse response = {};
@@ -379,6 +409,11 @@
 
 ScopedAStatus RemoteAccessService::unscheduleTask(const std::string& clientId,
                                                   const std::string& scheduleId) {
+    if (!isTaskScheduleSupported()) {
+        ALOGW("Task scheduleing is not supported, do nothing");
+        return ScopedAStatus::ok();
+    }
+
     ClientContext context;
     UnscheduleTaskRequest request = {};
     UnscheduleTaskResponse response = {};
@@ -392,6 +427,11 @@
 }
 
 ScopedAStatus RemoteAccessService::unscheduleAllTasks(const std::string& clientId) {
+    if (!isTaskScheduleSupported()) {
+        ALOGW("Task scheduleing is not supported, do nothing");
+        return ScopedAStatus::ok();
+    }
+
     ClientContext context;
     UnscheduleAllTasksRequest request = {};
     UnscheduleAllTasksResponse response = {};
@@ -405,6 +445,12 @@
 
 ScopedAStatus RemoteAccessService::isTaskScheduled(const std::string& clientId,
                                                    const std::string& scheduleId, bool* out) {
+    if (!isTaskScheduleSupported()) {
+        ALOGW("Task scheduleing is not supported, return false");
+        *out = false;
+        return ScopedAStatus::ok();
+    }
+
     ClientContext context;
     IsTaskScheduledRequest request = {};
     IsTaskScheduledResponse response = {};
@@ -420,6 +466,12 @@
 
 ScopedAStatus RemoteAccessService::getAllPendingScheduledTasks(const std::string& clientId,
                                                                std::vector<ScheduleInfo>* out) {
+    if (!isTaskScheduleSupported()) {
+        ALOGW("Task scheduleing is not supported, return empty array");
+        out->clear();
+        return ScopedAStatus::ok();
+    }
+
     ClientContext context;
     GetAllPendingScheduledTasksRequest request = {};
     GetAllPendingScheduledTasksResponse response = {};
@@ -560,9 +612,11 @@
     dprintf(fd,
             "\nRemoteAccess HAL status \n"
             "Remote task callback registered: %s\n"
-            "Task receiving GRPC connection established: %s\n"
+            "GRPC server exist: %s\n"
+            "GRPC read channel for receiving tasks open: %s\n"
             "Received task count by clientId: \n%s\n",
-            boolToString(mRemoteTaskCallback.get()).c_str(), boolToString(mGrpcConnected).c_str(),
+            boolToString(mRemoteTaskCallback.get()).c_str(), boolToString(mGrpcServerExist).c_str(),
+            boolToString(mGrpcReadChannelOpen).c_str(),
             clientIdToTaskCountToStringLocked().c_str());
 }