DTC U1280 (Keyless Access Power Control Unit) (2025)

DTC U1280  : B-CAN communication bus line error (BUS-OFF)

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
• Troubleshoot the following DTCs first, if stored at the same time.
• Network Communication System: DTC U1280-00 DTC U1280 (KEYLESS ACCESS BACKUP 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
   U1280 B-CAN communication bus line error (BUS-OFF)

   Is DTC U1280 indicated?

   YES 

   CAN gateway DTC U1280-00 troubleshooting.

   NO 

   Intermittent failure, the system is OK at this time.