DTC Troubleshooting: B1178, B1168, B1169

DTC B1178: F-CAN Communication Line Error DTC B1168: Gauge Control Module Lost Communication with ECM/PCM (Engine Messages) DTC B1169: Gauge Control Module Lost Communication with the PCM (A/T Messages)

1. Clear the DTCs using the HDS.

1. Turn the ignition switch OFF then back to the ON (II).

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

1. Check for DTCs by selecting the DTCs MENU (DTCs) from the HDS.

Is DTC B1178, B1168 and/or B1169 indicated?

YES | - | Go to Step 5 .
NO | - | Intermittent failure, the F-CAN communication line is OK at this time.■

1. Check for DTCs in the ECM/PCM.

Are any DTCs indicated?

YES | - | Troubleshoot the ECM/PCM DTCs.■
NO | - | Go to Step 6 .

1. Perform the gauge control module input test.

Are all inputs OK?

YES | - | Go to Step 7 .
NO | - | Repair the faulty input then recheck for DTCs.■

1. Substitute a known-good gauge control module.

1. Clear the DTCs using HDS.

1. Turn the ignition switch OFF then back to the ON (II).

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

1. Check for DTCs by selecting the DTCs MENU (DTCs) from the HDS.

Is DTC B1178, B1168 and/or B1169 indicated?

YES | - | Replace the ECM / PCM .■
NO | - | The original gauge control module is faulty; replace the gauge control module .■