B1168

DTC Troubleshooting: B1168, B1169

DTC B1168:

Gauge Control Module Lost Communication With the ECM/PCM (Engine Messages)

DTC B1169:

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

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.

Are DTCs B1168 or B1169 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the F-CAN communication line is OK at this time. Check for loose or poor connections. If the connections are good, check the battery condition Testing and Inspection, and the charging system.�

5. Check for DTCs with the HDS.

Is DTC B1178 also indicated at the same time?

YES -

Troubleshoot DTC B1178 B1178.�

NO -

Go to step 6.

6. Check for DTCs in the ECM/PCM with the HDS.

Are any DTCs indicated?

YES -

Troubleshoot the ECM/PCM DTCs.�

NO -

Go to step 7.

7. Turn the ignition switch to LOCK (0).

8. Disconnect the gauge control module 36P connector.

9. Jump the SCS line with the HDS.

10. Disconnect the ECM/PCM connector E (31P).

11. Check for continuity between gauge control module 36P connector terminals No. 28 and No. 29 and ECM/PCM connector E (31P) terminals No. 24 and No. 11 respectively.





Is there continuity?

YES -

Go to step 12.

NO -

Repair an open in the wire between the gauge control module and the ECM/PCM.�

12. Substitute a known-good gauge control module and retest.

13. Check for DTCs with the HDS.

Are DTCs B1168 or B1169 indicated?

YES -

Replace the ECM/PCM ECM/PCM Replacement (A/T).�

NO -

Replace the original gauge control module Service and Repair.�