DTC U0122 (Keyless Access Power Control Unit) (2025)

DTC U0122  : BCM lost communication with VSA/ABS

NOTE: 

• If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: BODY ELECTRICAL TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE 1 AND TEST MODE 2 (WITHOUT THE HDS) or BODY ELECTRICAL TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A - INITIAL COMMUNICATION AND DTC CHECKS or BODY ELECTRICAL TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE B - CONTROL UNIT NOT COMMUNICATING .
• Before you troubleshoot, review the general troubleshooting information. - Refer to: HOW TO TROUBLESHOOT THE BODY ELECTRICAL
• NETWORK COMMUNICATIONS SYSTEM DESCRIPTION (2021 2022 2023 2024 2025) .
• If the VSA modulator-control unit does not start normally, DTC may be stored.
• Check the power circuit and ground circuit of the VSA modulator-control unit.

DTC (Keyless Access Power Control Unit)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Turn the vehicle to the OFF (LOCK) mode.

   -4. Turn the vehicle to the ON mode.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC
   U0122 BCM lost communication with VSA/ABS

   Is DTC U0122 indicated?

   YES 

   Go to the Network Communications troubleshooting (F-CAN Lost Communication (CAN BUS with Connection to CAN Gateway)) - Refer to: Network Communications Symptom Troubleshooting Index(B-CAN Lost Communication) (2025).

   NO 

   Intermittent failure, the system is OK at this time.