U128B

DTC Troubleshooting: U128B

DTC U128B:

Gauge Control Module Lost Communication With Power Control Unit

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.

1. Clear the DTCs with the HDS.

2. Press the engine start/stop button to select the OFF, ACC, ON, and OFF mode.

3. Wait for at least 6 seconds.

4. Check for DTCs with the HDS.

Is DTC U128B indicated?

YES -

Go to the power control unit input test, and do all power, ground, and communication input tests. If the tests prove OK, replace the power control unit.�

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections at power control unit connector C (36P) and the related units.�