diff --git a/radio/1.5/IRadioIndication.hal b/radio/1.5/IRadioIndication.hal
index 81452ab..879e9ad 100644
--- a/radio/1.5/IRadioIndication.hal
+++ b/radio/1.5/IRadioIndication.hal
@@ -30,4 +30,33 @@
      * @param enabled whether uiccApplications are enabled, or disabled
      */
     oneway uiccApplicationsEnablementChanged(RadioIndicationType type, bool enabled);
+
+    /**
+     * Report that Registration or a Location/Routing/Tracking Area update has failed.
+     *
+     * <p>Indicate whenever a registration procedure, including a location, routing, or tracking
+     * area update fails. This includes procedures that do not necessarily result in a change of
+     * the modem's registration status. If the modem's registration status changes, that is
+     * reflected in the onNetworkStateChanged() and subsequent get{Voice/Data}RegistrationState().
+     *
+     * @param cellIdentity the CellIdentity, which must include the globally unique identifier for
+     *        the cell (for example, all components of the CGI or ECGI).
+     * @param chosenPlmn a 5 or 6 digit alphanumeric PLMN (MCC|MNC) among those broadcast by the
+     *        cell that was chosen for the failed registration attempt.
+     * @param domain Domain::CS, Domain::PS, or both in case of a combined procedure.
+     * @param causeCode the primary failure cause code of the procedure.
+     *        For GSM/UMTS (MM), values are in TS 24.008 Sec 10.5.95
+     *        For GSM/UMTS (GMM), values are in TS 24.008 Sec 10.5.147
+     *        For LTE (EMM), cause codes are TS 24.301 Sec 9.9.3.9
+     *        For NR (5GMM), cause codes are TS 24.501 Sec 9.11.3.2
+     *        MAX_INT if this value is unused.
+     * @param additionalCauseCode the cause code of any secondary/combined procedure if appropriate.
+     *        For UMTS, if a combined attach succeeds for PS only, then the GMM cause code shall be
+     *        included as an additionalCauseCode.
+     *        For LTE (ESM), cause codes are in TS 24.301 9.9.4.4
+     *        MAX_INT if this value is unused.
+     */
+    oneway registrationFailed(
+            RadioIndicationType type, CellIdentity cellIdentity, string chosenPlmn,
+            bitfield<Domain> domain, int32_t causeCode, int32_t additionalCauseCode);
 };
diff --git a/radio/1.5/types.hal b/radio/1.5/types.hal
index a34f5e6..7d6ec41 100644
--- a/radio/1.5/types.hal
+++ b/radio/1.5/types.hal
@@ -22,14 +22,22 @@
 import @1.1::RadioAccessSpecifier;
 import @1.1::ScanType;
 import @1.1::UtranBands;
+import @1.2::CellIdentityCdma;
+import @1.2::CellIdentityGsm;
+import @1.2::CellIdentityWcdma;
+import @1.2::CellIdentityTdscdma;
+import @1.2::CellIdentityLte;
 import @1.2::NetworkScanRequest;
 import @1.4::AccessNetwork;
 import @1.4::ApnTypes;
+import @1.4::CellIdentityNr;
 import @1.4::DataCallFailCause;
 import @1.4::DataConnActiveStatus;
 import @1.4::DataProfileInfo;
 import @1.4::PdpProtocolType;
 
+import android.hidl.safe_union@1.0::Monostate;
+
 /**
  * Defining signal strength type.
  */
@@ -397,3 +405,22 @@
     int32_t mtu;
 };
 
+enum Domain : int32_t {
+    /** Circuit-switched */
+    CS = 1 << 0,
+
+    /** Packet-switched */
+    PS = 1 << 1,
+};
+
+/** A union representing the CellIdentity of a single cell */
+safe_union CellIdentity {
+    Monostate noinit;
+
+    CellIdentityGsm gsm;
+    CellIdentityWcdma wcdma;
+    CellIdentityTdscdma tdscdma;
+    CellIdentityCdma cdma;
+    CellIdentityLte lte;
+    CellIdentityNr nr;
+};
diff --git a/radio/1.5/vts/functional/radio_hidl_hal_utils_v1_5.h b/radio/1.5/vts/functional/radio_hidl_hal_utils_v1_5.h
index ba11257..49a315d 100644
--- a/radio/1.5/vts/functional/radio_hidl_hal_utils_v1_5.h
+++ b/radio/1.5/vts/functional/radio_hidl_hal_utils_v1_5.h
@@ -739,6 +739,13 @@
 
     Return<void> modemReset(RadioIndicationType type,
                             const ::android::hardware::hidl_string& reason);
+
+    Return<void> registrationFailed(
+            RadioIndicationType type,
+            const ::android::hardware::radio::V1_5::CellIdentity& cellIdentity,
+            const ::android::hardware::hidl_string& chosenPlmn,
+            ::android::hardware::hidl_bitfield<::android::hardware::radio::V1_5::Domain> domain,
+            int32_t causeCode, int32_t additionalCauseCode);
 };
 
 // Test environment for Radio HIDL HAL.
diff --git a/radio/1.5/vts/functional/radio_indication.cpp b/radio/1.5/vts/functional/radio_indication.cpp
index acffbbe..2416605 100644
--- a/radio/1.5/vts/functional/radio_indication.cpp
+++ b/radio/1.5/vts/functional/radio_indication.cpp
@@ -333,3 +333,12 @@
                                                                      bool /*enabled*/) {
     return Void();
 }
+
+Return<void> RadioIndication_v1_5::registrationFailed(
+        RadioIndicationType /*type*/,
+        const ::android::hardware::radio::V1_5::CellIdentity& /*cellIdentity*/,
+        const ::android::hardware::hidl_string& /*chosenPlmn*/,
+        ::android::hardware::hidl_bitfield<::android::hardware::radio::V1_5::Domain> /*domain*/,
+        int32_t /*causeCode*/, int32_t /*additionalCauseCode*/) {
+    return Void();
+}