diff --git a/automotive/remoteaccess/aidl_api/android.hardware.automotive.remoteaccess/current/android/hardware/automotive/remoteaccess/ScheduleInfo.aidl b/automotive/remoteaccess/aidl_api/android.hardware.automotive.remoteaccess/current/android/hardware/automotive/remoteaccess/ScheduleInfo.aidl
index a5d81cf..ec8733a 100644
--- a/automotive/remoteaccess/aidl_api/android.hardware.automotive.remoteaccess/current/android/hardware/automotive/remoteaccess/ScheduleInfo.aidl
+++ b/automotive/remoteaccess/aidl_api/android.hardware.automotive.remoteaccess/current/android/hardware/automotive/remoteaccess/ScheduleInfo.aidl
@@ -41,4 +41,5 @@
   int count;
   long startTimeInEpochSeconds;
   long periodicInSeconds;
+  const int MAX_TASK_DATA_SIZE_IN_BYTES = 10240;
 }
diff --git a/automotive/remoteaccess/android/hardware/automotive/remoteaccess/IRemoteAccess.aidl b/automotive/remoteaccess/android/hardware/automotive/remoteaccess/IRemoteAccess.aidl
index 705cdbd..f0468c4 100644
--- a/automotive/remoteaccess/android/hardware/automotive/remoteaccess/IRemoteAccess.aidl
+++ b/automotive/remoteaccess/android/hardware/automotive/remoteaccess/IRemoteAccess.aidl
@@ -167,6 +167,9 @@
      * {@code scheduleId} for this client exists.
      *
      * <p>Must return {@code EX_ILLEGAL_ARGUMENT} if the task type is not supported.
+     *
+     * <p>Must return {@code EX_ILLEGLA_ARGUMENT} if the scheduleInfo is not valid (e.g. count is
+     * a negative number).
      */
     void scheduleTask(in ScheduleInfo scheduleInfo);
 
diff --git a/automotive/remoteaccess/android/hardware/automotive/remoteaccess/ScheduleInfo.aidl b/automotive/remoteaccess/android/hardware/automotive/remoteaccess/ScheduleInfo.aidl
index 40fba6f..4f2537c 100644
--- a/automotive/remoteaccess/android/hardware/automotive/remoteaccess/ScheduleInfo.aidl
+++ b/automotive/remoteaccess/android/hardware/automotive/remoteaccess/ScheduleInfo.aidl
@@ -21,6 +21,7 @@
 @VintfStability
 @JavaDerive(equals=true, toString=true)
 parcelable ScheduleInfo {
+    const int MAX_TASK_DATA_SIZE_IN_BYTES = 10240;
     /**
      * The ID used to identify the client this schedule is for. This must be one of the
      * preconfigured remote access serverless client ID defined in car service resource
@@ -41,6 +42,8 @@
      * executed. It is not interpreted/parsed by the Android system.
      *
      * <p>This is only used for {@code TaskType.CUSTOM}.
+     *
+     * <p>The data size must be less than {@link MAX_TASK_DATA_SIZE_IN_BYTES}.
      */
     byte[] taskData;
     /**
diff --git a/automotive/remoteaccess/hal/default/src/RemoteAccessService.cpp b/automotive/remoteaccess/hal/default/src/RemoteAccessService.cpp
index 2a7f209..1b42a1f 100644
--- a/automotive/remoteaccess/hal/default/src/RemoteAccessService.cpp
+++ b/automotive/remoteaccess/hal/default/src/RemoteAccessService.cpp
@@ -331,6 +331,24 @@
     ClientContext context;
     ScheduleTaskRequest request = {};
     ScheduleTaskResponse response = {};
+
+    if (scheduleInfo.count < 0) {
+        return ScopedAStatus::fromExceptionCodeWithMessage(EX_ILLEGAL_ARGUMENT,
+                                                           "count must be >= 0");
+    }
+    if (scheduleInfo.startTimeInEpochSeconds < 0) {
+        return ScopedAStatus::fromExceptionCodeWithMessage(EX_ILLEGAL_ARGUMENT,
+                                                           "startTimeInEpochSeconds must be >= 0");
+    }
+    if (scheduleInfo.periodicInSeconds < 0) {
+        return ScopedAStatus::fromExceptionCodeWithMessage(EX_ILLEGAL_ARGUMENT,
+                                                           "periodicInSeconds must be >= 0");
+    }
+    if (scheduleInfo.taskData.size() > scheduleInfo.MAX_TASK_DATA_SIZE_IN_BYTES) {
+        return ScopedAStatus::fromExceptionCodeWithMessage(EX_ILLEGAL_ARGUMENT,
+                                                           "task data too big");
+    }
+
     request.mutable_scheduleinfo()->set_clientid(scheduleInfo.clientId);
     request.mutable_scheduleinfo()->set_scheduleid(scheduleInfo.scheduleId);
     request.mutable_scheduleinfo()->set_data(scheduleInfo.taskData.data(),
@@ -348,7 +366,8 @@
         case ErrorCode::OK:
             return ScopedAStatus::ok();
         case ErrorCode::INVALID_ARG:
-            return ScopedAStatus::fromExceptionCode(EX_ILLEGAL_ARGUMENT);
+            return ScopedAStatus::fromExceptionCodeWithMessage(
+                    EX_ILLEGAL_ARGUMENT, "received invalid_arg from grpc server");
         default:
             // Should not happen.
             return ScopedAStatus::fromServiceSpecificErrorWithMessage(
diff --git a/automotive/remoteaccess/hal/default/test/RemoteAccessServiceUnitTest.cpp b/automotive/remoteaccess/hal/default/test/RemoteAccessServiceUnitTest.cpp
index a46a983..7992a50 100644
--- a/automotive/remoteaccess/hal/default/test/RemoteAccessServiceUnitTest.cpp
+++ b/automotive/remoteaccess/hal/default/test/RemoteAccessServiceUnitTest.cpp
@@ -473,7 +473,71 @@
     EXPECT_EQ(grpcRequest.scheduleinfo().periodicinseconds(), kTestPeriodicInSeconds);
 }
 
-TEST_F(RemoteAccessServiceUnitTest, TestScheduleTask_InvalidArg) {
+TEST_F(RemoteAccessServiceUnitTest, TestScheduleTask_InvalidCount) {
+    ScheduleInfo scheduleInfo = {
+            .clientId = kTestClientId,
+            .scheduleId = kTestScheduleId,
+            .taskData = kTestData,
+            .count = -1,
+            .startTimeInEpochSeconds = kTestStartTimeInEpochSeconds,
+            .periodicInSeconds = kTestPeriodicInSeconds,
+    };
+
+    ScopedAStatus status = getService()->scheduleTask(scheduleInfo);
+
+    ASSERT_FALSE(status.isOk());
+    ASSERT_EQ(status.getExceptionCode(), EX_ILLEGAL_ARGUMENT);
+}
+
+TEST_F(RemoteAccessServiceUnitTest, TestScheduleTask_InvalidStartTimeInEpochSeconds) {
+    ScheduleInfo scheduleInfo = {
+            .clientId = kTestClientId,
+            .scheduleId = kTestScheduleId,
+            .taskData = kTestData,
+            .count = kTestCount,
+            .startTimeInEpochSeconds = -1,
+            .periodicInSeconds = kTestPeriodicInSeconds,
+    };
+
+    ScopedAStatus status = getService()->scheduleTask(scheduleInfo);
+
+    ASSERT_FALSE(status.isOk());
+    ASSERT_EQ(status.getExceptionCode(), EX_ILLEGAL_ARGUMENT);
+}
+
+TEST_F(RemoteAccessServiceUnitTest, TestScheduleTask_InvalidPeriodicInSeconds) {
+    ScheduleInfo scheduleInfo = {
+            .clientId = kTestClientId,
+            .scheduleId = kTestScheduleId,
+            .taskData = kTestData,
+            .count = kTestCount,
+            .startTimeInEpochSeconds = kTestStartTimeInEpochSeconds,
+            .periodicInSeconds = -1,
+    };
+
+    ScopedAStatus status = getService()->scheduleTask(scheduleInfo);
+
+    ASSERT_FALSE(status.isOk());
+    ASSERT_EQ(status.getExceptionCode(), EX_ILLEGAL_ARGUMENT);
+}
+
+TEST_F(RemoteAccessServiceUnitTest, TestScheduleTask_TaskDataTooLarge) {
+    ScheduleInfo scheduleInfo = {
+            .clientId = kTestClientId,
+            .scheduleId = kTestScheduleId,
+            .taskData = std::vector<uint8_t>(ScheduleInfo::MAX_TASK_DATA_SIZE_IN_BYTES + 1),
+            .count = kTestCount,
+            .startTimeInEpochSeconds = kTestStartTimeInEpochSeconds,
+            .periodicInSeconds = kTestPeriodicInSeconds,
+    };
+
+    ScopedAStatus status = getService()->scheduleTask(scheduleInfo);
+
+    ASSERT_FALSE(status.isOk());
+    ASSERT_EQ(status.getExceptionCode(), EX_ILLEGAL_ARGUMENT);
+}
+
+TEST_F(RemoteAccessServiceUnitTest, TestScheduleTask_InvalidArgFromGrpcServer) {
     EXPECT_CALL(*getGrpcWakeupClientStub(), ScheduleTask)
             .WillOnce([]([[maybe_unused]] ClientContext* context,
                          [[maybe_unused]] const ScheduleTaskRequest& request,