April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC Troubleshooting: U1280(Relay Control Module): Notes

DTCU1280 : B-CAN communication bus line error (BUS-OFF)

How to use this service information .

NOTICE:

Before you troubleshoot, review the How to Troubleshoot .
Troubleshoot the following DTCs first, if stored at the same time.
- -
  Network Communications [CAN Gateway]: DTC U1280-00 - Refer to: DTC Troubleshooting: U1280-00(CAN Gateway) (2022-24) or DTC Troubleshooting: U1280-00(CAN Gateway) (2025)

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 B - Control Unit Not Communicating or Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .