diff --git a/automotive/audiocontrol/1.0/Android.bp b/automotive/audiocontrol/1.0/Android.bp
index a967049..9335a6c 100644
--- a/automotive/audiocontrol/1.0/Android.bp
+++ b/automotive/audiocontrol/1.0/Android.bp
@@ -9,13 +9,11 @@
     srcs: [
         "types.hal",
         "IAudioControl.hal",
-        "IAudioControlCallback.hal",
     ],
     interfaces: [
         "android.hidl.base@1.0",
     ],
     types: [
-        "AudioResult",
         "ContextNumber",
     ],
     gen_java: true,
diff --git a/automotive/audiocontrol/1.0/IAudioControl.hal b/automotive/audiocontrol/1.0/IAudioControl.hal
index fe9ea8e..c029499 100644
--- a/automotive/audiocontrol/1.0/IAudioControl.hal
+++ b/automotive/audiocontrol/1.0/IAudioControl.hal
@@ -16,8 +16,6 @@
 
 package android.hardware.automotive.audiocontrol@1.0;
 
-import IAudioControlCallback;
-
 
 /**
  * Interacts with the car's audio subsystem to manage audio sources and volumes
@@ -25,15 +23,6 @@
 interface IAudioControl {
 
     /**
-     * Registers the required callback object so that we can be notified when the state
-     * of the car's audio system changes. This call must be made when the interface is
-     * initialized.
-     */
-    setCallback(IAudioControlCallback notificationObject)
-        generates (AudioResult result);
-
-
-    /**
      * Called at startup once per context to get the mapping from ContextNumber to
      * busAddress. This lets the car tell the framework to which physical output stream
      * each context should be routed.
diff --git a/automotive/audiocontrol/1.0/IAudioControlCallback.hal b/automotive/audiocontrol/1.0/IAudioControlCallback.hal
deleted file mode 100644
index f5c227e..0000000
--- a/automotive/audiocontrol/1.0/IAudioControlCallback.hal
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * Copyright (C) 2017 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package android.hardware.automotive.audiocontrol@1.0;
-
-
-/**
- * Implemented on client (framework) side to receive asynchronous updates from the car.
- */
-interface IAudioControlCallback {
-
-    /**
-     * When the HAL makes this call, any apps currently playing must be asked to
-     * temporarily suspend playback (via an AudioManager::AUDIOFOCUS_LOSS_TRANSIENT event).
-     *
-     * This is only a suggestion. Apps may be slow to react or even ignore this message
-     * entirely. Enforcement, if necessary, must be done at the AudioHAL level as the
-     * samples are delivered. In most instances, this is the way a car should ask for
-     * quiet if it needs it for some important situation, such as warning alarms or chimes.
-     */
-    oneway suggestPausePlayers();
-
-
-    /**
-     * When the HAL makes this case, any apps currently playing must be asked to stop
-     * playing (via an AudioManager::AUDIOFOCUS_LOSS event). Once stopped, the apps must
-     * not resume their playback.
-     *
-     * It should be noted that not all apps or sound sources honor this request, but this
-     * at least gives an app the chance to do the right thing.
-     * Because it premanently stops media, this call is expected to be used only rarely.
-     * Perhaps in the event of an E-call, where resuming music might be undesirable assuming
-     * the driver is now dealing with whatever the emergency is?
-     */
-    oneway suggestStopPlayers();
-
-
-    /**
-     * Receives calls from the HAL when Android should resume normal operations. If the previous
-     * action was a requestPausePlayers, then things that were paused must be told they may
-     * resume.
-     */
-    oneway resumePlayers();
-};
diff --git a/automotive/audiocontrol/1.0/default/Android.bp b/automotive/audiocontrol/1.0/default/Android.bp
index 614c58b..0e074dd 100644
--- a/automotive/audiocontrol/1.0/default/Android.bp
+++ b/automotive/audiocontrol/1.0/default/Android.bp
@@ -19,7 +19,6 @@
     relative_install_path: "hw",
     srcs: [
         "AudioControl.cpp",
-        "AudioControlCallback.cpp",
         "service.cpp"
     ],
     init_rc: ["android.hardware.automotive.audiocontrol@1.0-service.rc"],
diff --git a/automotive/audiocontrol/1.0/default/AudioControl.cpp b/automotive/audiocontrol/1.0/default/AudioControl.cpp
index 419225d..b40f2ae 100644
--- a/automotive/audiocontrol/1.0/default/AudioControl.cpp
+++ b/automotive/audiocontrol/1.0/default/AudioControl.cpp
@@ -36,15 +36,6 @@
 };
 
 
-// Methods from ::android::hardware::automotive::audiocontrol::V1_0::IAudioControl follow.
-Return<AudioResult> AudioControl::setCallback(const sp<IAudioControlCallback>& notificationObject) {
-    // Hang onto the provided callback object for future use
-    callback = notificationObject;
-
-    return AudioResult::OK;
-}
-
-
 Return<int32_t> AudioControl::getBusForContext(uint32_t contextNumber) {
     if (contextNumber > sContextNumberMax) {
         ALOGE("Unexpected context number %d (max expected is %d)", contextNumber, sContextCount);
diff --git a/automotive/audiocontrol/1.0/default/AudioControl.h b/automotive/audiocontrol/1.0/default/AudioControl.h
index 3383875..89e41f9 100644
--- a/automotive/audiocontrol/1.0/default/AudioControl.h
+++ b/automotive/audiocontrol/1.0/default/AudioControl.h
@@ -23,16 +23,12 @@
 struct AudioControl : public IAudioControl {
 public:
     // Methods from ::android::hardware::automotive::audiocontrol::V1_0::IAudioControl follow.
-    Return<AudioResult> setCallback(const sp<IAudioControlCallback>& notificationObject) override;
     Return<int32_t> getBusForContext(uint32_t contextNumber) override;
     Return<void> setBalanceTowardRight(float value) override;
     Return<void> setFadeTowardFront(float value) override;
 
     // Implementation details
     AudioControl();
-
-private:
-    sp<IAudioControlCallback> callback;
 };
 
 }  // namespace implementation
diff --git a/automotive/audiocontrol/1.0/default/AudioControlCallback.cpp b/automotive/audiocontrol/1.0/default/AudioControlCallback.cpp
deleted file mode 100644
index ea79cad..0000000
--- a/automotive/audiocontrol/1.0/default/AudioControlCallback.cpp
+++ /dev/null
@@ -1,31 +0,0 @@
-#include "AudioControlCallback.h"
-
-namespace android {
-namespace hardware {
-namespace automotive {
-namespace audiocontrol {
-namespace V1_0 {
-namespace implementation {
-
-// Methods from ::android::hardware::automotive::audiocontrol::V1_0::IAudioControlCallback follow.
-Return<void> AudioControlCallback::suggestPausePlayers() {
-    // TODO implement in framework (this is called by the HAL implementation when needed)
-    return Void();
-}
-
-Return<void> AudioControlCallback::suggestStopPlayers() {
-    // TODO implement in framework (this is called by the HAL implementation when needed)
-    return Void();
-}
-
-Return<void> AudioControlCallback::resumePlayers() {
-    // TODO implement in framework (this is called by the HAL implementation when needed)
-    return Void();
-}
-
-}  // namespace implementation
-}  // namespace V1_0
-}  // namespace audiocontrol
-}  // namespace automotive
-}  // namespace hardware
-}  // namespace android
diff --git a/automotive/audiocontrol/1.0/default/AudioControlCallback.h b/automotive/audiocontrol/1.0/default/AudioControlCallback.h
deleted file mode 100644
index 1054548..0000000
--- a/automotive/audiocontrol/1.0/default/AudioControlCallback.h
+++ /dev/null
@@ -1,41 +0,0 @@
-#ifndef ANDROID_HARDWARE_AUTOMOTIVE_AUDIOCONTROL_V1_0_AUDIOCONTROLCALLBACK_H
-#define ANDROID_HARDWARE_AUTOMOTIVE_AUDIOCONTROL_V1_0_AUDIOCONTROLCALLBACK_H
-
-#include <android/hardware/automotive/audiocontrol/1.0/IAudioControlCallback.h>
-#include <hidl/MQDescriptor.h>
-#include <hidl/Status.h>
-
-namespace android {
-namespace hardware {
-namespace automotive {
-namespace audiocontrol {
-namespace V1_0 {
-namespace implementation {
-
-using ::android::hardware::hidl_array;
-using ::android::hardware::hidl_memory;
-using ::android::hardware::hidl_string;
-using ::android::hardware::hidl_vec;
-using ::android::hardware::Return;
-using ::android::hardware::Void;
-using ::android::sp;
-
-// TODO:  Move this into packages/services/Car...
-struct AudioControlCallback : public IAudioControlCallback {
-    // Methods from ::android::hardware::automotive::audiocontrol::V1_0::IAudioControlCallback follow.
-    Return<void> suggestPausePlayers() override;
-    Return<void> suggestStopPlayers() override;
-    Return<void> resumePlayers() override;
-
-    // Methods from ::android::hidl::base::V1_0::IBase follow.
-
-};
-
-}  // namespace implementation
-}  // namespace V1_0
-}  // namespace audiocontrol
-}  // namespace automotive
-}  // namespace hardware
-}  // namespace android
-
-#endif  // ANDROID_HARDWARE_AUTOMOTIVE_AUDIOCONTROL_V1_0_AUDIOCONTROLCALLBACK_H
diff --git a/automotive/audiocontrol/1.0/types.hal b/automotive/audiocontrol/1.0/types.hal
index 6301d3a..04d8d35 100644
--- a/automotive/audiocontrol/1.0/types.hal
+++ b/automotive/audiocontrol/1.0/types.hal
@@ -33,12 +33,3 @@
     NOTIFICATION,   /* Notifications */
     SYSTEM_SOUND,   /* User interaction sounds (button clicks, etc) */
 };
-
-
-/** Error codes used in AudioControl HAL interface. */
-enum AudioResult : uint32_t {
-    OK = 0,
-    NOT_AVAILABLE,
-    INVALID_ARGUMENT,
-    UNDERLYING_SERVICE_ERROR,
-};