B1956

DTC Troubleshooting: B1956

DTC B1956: Rear MICU Lost Communication with Gauge Control Module (A/T Message)

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. Turn the ignition switch to LOCK (0) and then back ON (II).

3. Wait for more than 6 seconds.

4. Check for DTCs with the HDS.

Is DTC B1956 indicated?
YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections between the rear MICU and the gauge control module.


5. Check for DTCs with the HDS.

Are DTCs B1011, B1061, and B1906 also indicated?
YES - Do the gauge control module input test. Gauge Control Module Input Test

NO - Do the rear MICU input test. Rear MICU Input Test