DTC Troubleshooting: B1168, B1169, B1178
DTC B1168:
Gauge Control Module Lost Communication with PCM (ENG Message)
DTC B1169:
Gauge Control Module Lost Communication with PCM (A/T Message)
DTC B1178:
F-CAN Communication Line Error
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A See: Powertrain
Management/Computers and Control Systems/Information Bus/Testing and Inspection/Component Tests and General Diagnostics/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. Wait for at least 6 seconds.
4. Check for DTCs with the HDS.
Is DTC B1168, B1169, and/or B1178 indicated?
YES -
Go to step 5.
NO -
Intermittent failure, the system is OK at this time. Check for loose or poor connection between the gauge control module and the PCM.?
5. Check for Fuel and Emissions Systems DTCs with the HDS.
Are there any DTCs indicated?
YES -
Go to and troubleshoot the indicated DTCs, then recheck.?
NO -
Go to step 6.
6. Turn the ignition switch to LOCK (0).
7. Disconnect gauge control module connector A (12P).
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (49P).
10. Check for continuity between PCM connector A (49P) terminals No. 48 and No. 49 and gauge control module connector A (12P) connector
terminals No. 12 and No. 6 respectively.
