DTC B1168: Gauge Control Module Lost Communication with ECM/PCM (Engine Messages); DTC B1169: Gauge Control Module Lost Communication with PCM (A/T Messages)

WARNING: This page is about a different car, the 2008 Acura TL and 2007 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Clear the DTCs with the HDS.
Turn the ignition switch OFF, and then back ON (II).
Start and run the engine for at least 5 seconds then turn the engine off.
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 (see BATTERY TEST ) and the charging system.
Check for DTCs in the ECM/PCM with the HDS.
Are any DTCs indicated?

YES -Go to the indicated DTCs troubleshooting.

NO -Go to step 6.
Do the Gauge Control Module Input Test (see GAUGE CONTROL MODULE INPUT TEST ).
Are all inputs OK?

YES -Go to step 7.

NO -Repair the faulty input, then recheck the DTCs.
Substitute a known-good gauge control module.
Clear the DTCs with the HDS.
Turn the ignition switch OFF, and then back ON (II).
Start and run the engine for at least 5 seconds then turn the engine off.
Check for DTCs with the HDS.
Are DTCs B1168 or B1169 indicated?

YES -Replace the ECM/PCM.

NO -The original gauge control module is faulty; replace it (see GAUGE CONTROL MODULE REPLACEMENT ).