B1168

DTC Troubleshooting: B1168, B1169

DTC B1168:

Gauge Control Module Lost Communication With PCM (Engine Messages)

DTC B1169:

Gauge Control Module Lost Communication With PCM (A/T Messages)

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 to ON (II).

3. Start and run the engine for at least 5 seconds then turn the engine off.

4. Check for DTCs with the HDS.

Is DTC B1168 or B1169 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the F-CAN communication line is OK at this time. Check for DTCs in the PCM with the HDS. If F-CAN DTCs are present, check for loose or poor connections at the gauge control module and the PCM. If the connections are good, check the battery condition Testing and Inspection and the charging system, then clear all DTCs.�

5. Check for DTCs in the PCM with the HDS.

Are any DTCs indicated?

YES -

Go to the PCM indicated DTCs troubleshooting.�

NO -

Go to step 6.

6. Do the gauge control module input test Gauge Control Module Input Test.

Are all inputs OK?

YES -

Go to step 7.

NO -

Repair the faulty input, then recheck the DTCs.�

7. Substitute a known-good gauge control module.

8. Clear the DTCs with the HDS.

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

10. Start and run the engine for at least 5 seconds then turn the engine off.

11. Check for DTCs with the HDS.

Is DTC B1168 or B1169 indicated?

YES -

Replace the PCM.�

NO -

The original gauge control module is faulty; replace it Service and Repair.�