diff --git a/gnss/aidl/aidl_api/android.hardware.gnss/current/android/hardware/gnss/IGnssCallback.aidl b/gnss/aidl/aidl_api/android.hardware.gnss/current/android/hardware/gnss/IGnssCallback.aidl
index fd07a6e..0247182 100644
--- a/gnss/aidl/aidl_api/android.hardware.gnss/current/android/hardware/gnss/IGnssCallback.aidl
+++ b/gnss/aidl/aidl_api/android.hardware.gnss/current/android/hardware/gnss/IGnssCallback.aidl
@@ -61,6 +61,7 @@
   const int CAPABILITY_CORRELATION_VECTOR = 4096;
   const int CAPABILITY_SATELLITE_PVT = 8192;
   const int CAPABILITY_MEASUREMENT_CORRECTIONS_FOR_DRIVING = 16384;
+  const int CAPABILITY_ACCUMULATED_DELTA_RANGE = 32768;
   @Backing(type="int") @VintfStability
   enum GnssStatusValue {
     NONE = 0,
diff --git a/gnss/aidl/android/hardware/gnss/IGnssCallback.aidl b/gnss/aidl/android/hardware/gnss/IGnssCallback.aidl
index 2b2592b..ff9feea 100644
--- a/gnss/aidl/android/hardware/gnss/IGnssCallback.aidl
+++ b/gnss/aidl/android/hardware/gnss/IGnssCallback.aidl
@@ -82,6 +82,9 @@
     /** Capability bit mask indicating that GNSS supports measurement corrections for driving */
     const int CAPABILITY_MEASUREMENT_CORRECTIONS_FOR_DRIVING = 1 << 14;
 
+    /** Capability bit mask indicating that GNSS supports accumulated delta range */
+    const int CAPABILITY_ACCUMULATED_DELTA_RANGE = 1 << 15;
+
     /**
      * Callback to inform framework of the GNSS HAL implementation's capabilities.
      *
diff --git a/gnss/aidl/default/Gnss.cpp b/gnss/aidl/default/Gnss.cpp
index 23d7999..ec86d2e 100644
--- a/gnss/aidl/default/Gnss.cpp
+++ b/gnss/aidl/default/Gnss.cpp
@@ -60,7 +60,8 @@
                   IGnssCallback::CAPABILITY_SATELLITE_BLOCKLIST |
                   IGnssCallback::CAPABILITY_SATELLITE_PVT |
                   IGnssCallback::CAPABILITY_CORRELATION_VECTOR |
-                  IGnssCallback::CAPABILITY_ANTENNA_INFO);
+                  IGnssCallback::CAPABILITY_ANTENNA_INFO |
+                  IGnssCallback::CAPABILITY_ACCUMULATED_DELTA_RANGE);
     auto status = sGnssCallback->gnssSetCapabilitiesCb(capabilities);
     if (!status.isOk()) {
         ALOGE("%s: Unable to invoke callback.gnssSetCapabilitiesCb", __func__);
diff --git a/gnss/aidl/vts/gnss_hal_test_cases.cpp b/gnss/aidl/vts/gnss_hal_test_cases.cpp
index 31cef15..c1a177a 100644
--- a/gnss/aidl/vts/gnss_hal_test_cases.cpp
+++ b/gnss/aidl/vts/gnss_hal_test_cases.cpp
@@ -1505,10 +1505,11 @@
 }
 
 /*
- * TestGnssMeasurementSetCallback
- * 1. Start measurement with 20s interval. Expect the first measurement received in 10s.
+ * TestGnssMeasurementSetCallback:
+ * This test ensures setCallback() can be called consecutively without close().
+ * 1. Start measurement with 20s interval and wait for 1 measurement.
  * 2. Start measurement with 1s interval and wait for 5 measurements.
- * 3. Verify the received measurement intervals have expected mean and stddev.
+ *    Verify the measurements were received at 1Hz.
  */
 TEST_P(GnssHalTest, TestGnssMeasurementSetCallback) {
     if (aidl_gnss_hal_->getInterfaceVersion() <= 2) {
@@ -1581,3 +1582,57 @@
     status = iGnssMeasurement->close();
     ASSERT_TRUE(status.isOk());
 }
+
+/*
+ * TestAccumulatedDeltaRange:
+ * 1. Gets the GnssMeasurementExtension and verifies that it returns a non-null extension.
+ * 2. Start measurement with 1s interval and wait for up to 15 measurements.
+ * 3. Verify at least one measurement has a valid AccumulatedDeltaRange state.
+ */
+TEST_P(GnssHalTest, TestAccumulatedDeltaRange) {
+    if (aidl_gnss_hal_->getInterfaceVersion() <= 2) {
+        return;
+    }
+    if ((aidl_gnss_cb_->last_capabilities_ & IGnssCallback::CAPABILITY_ACCUMULATED_DELTA_RANGE) ==
+        0) {
+        return;
+    }
+
+    ALOGD("TestAccumulatedDeltaRange");
+
+    auto callback = sp<GnssMeasurementCallbackAidl>::make();
+    sp<IGnssMeasurementInterface> iGnssMeasurement;
+    auto status = aidl_gnss_hal_->getExtensionGnssMeasurement(&iGnssMeasurement);
+
+    IGnssMeasurementInterface::Options options;
+    options.intervalMs = 1000;
+    options.enableFullTracking = true;
+    status = iGnssMeasurement->setCallbackWithOptions(callback, options);
+
+    ASSERT_TRUE(status.isOk());
+    ASSERT_TRUE(iGnssMeasurement != nullptr);
+
+    bool accumulatedDeltaRangeFound = false;
+    const int kNumMeasurementEvents = 15;
+
+    // setCallback at 1s interval and wait for 15 measurements
+    for (int i = 0; i < kNumMeasurementEvents; i++) {
+        GnssData lastGnssData;
+        ASSERT_TRUE(callback->gnss_data_cbq_.retrieve(lastGnssData, 10));
+        EXPECT_EQ(callback->gnss_data_cbq_.calledCount(), i + 1);
+        ASSERT_TRUE(lastGnssData.measurements.size() > 0);
+
+        // Validity check GnssData fields
+        checkGnssMeasurementClockFields(lastGnssData);
+        for (const auto& measurement : lastGnssData.measurements) {
+            if ((measurement.accumulatedDeltaRangeState & measurement.ADR_STATE_VALID) > 0) {
+                accumulatedDeltaRangeFound = true;
+                break;
+            }
+        }
+        if (accumulatedDeltaRangeFound) break;
+    }
+    ASSERT_TRUE(accumulatedDeltaRangeFound);
+    status = iGnssMeasurement->close();
+    ASSERT_TRUE(status.isOk());
+}
\ No newline at end of file
diff --git a/gnss/common/utils/default/Utils.cpp b/gnss/common/utils/default/Utils.cpp
index ad351f8..2aed29b 100644
--- a/gnss/common/utils/default/Utils.cpp
+++ b/gnss/common/utils/default/Utils.cpp
@@ -170,7 +170,7 @@
             .agcLevelDb = 2.3,
             .pseudorangeRateMps = -484.13739013671875,
             .pseudorangeRateUncertaintyMps = 1.0379999876022339,
-            .accumulatedDeltaRangeState = GnssMeasurement::ADR_STATE_UNKNOWN,
+            .accumulatedDeltaRangeState = GnssMeasurement::ADR_STATE_VALID,
             .accumulatedDeltaRangeM = 1.52,
             .accumulatedDeltaRangeUncertaintyM = 2.43,
             .multipathIndicator = aidl::android::hardware::gnss::GnssMultipathIndicator::UNKNOWN,