DTC B1168, B1169: Gauge Control Module Lost Communication With ECM/PCM (Engine Messages); Gauge Control Module Lost Communication With the PCM (A/T Message)

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 to LOCK (0) and then back to ON (II).
Wait for at least 6 seconds.
Check for DTCs with the HDS.
Is DTC B1168 or B1169 indicated?

YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections.
Check for Fuel and Emission system DTCs with the HDS (see GENERAL TROUBLESHOOTING INFORMATION ).
Is any DTCs indicated?

YES - Go to the indicated DTCs troubleshooting, then recheck.

NO - Go to step 6.
Turn the ignition switch to LOCK (0).
Disconnect the gauge control module 32P connector.
Jump the SCS line with the HDS.
Disconnect ECM/PCM connector A (49P).
Check for continuity between gauge control module 32P connector terminals No. 29 and No. 30 and ECM/PCM connector terminals A (49P) terminals No. 4 and No. 3 respectively.

Fig 1: Checking Continuity Between ECM/PCM Connector A (49P) Terminals & Gauge Control Module 32P Connector Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Update the ECM/PCM if it does not have the latest software (see ELD REPLACEMENT ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), and recheck. If the indication goes away, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ). If the DTC is still present, replace the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ).

NO - Repair an open or high resistance in the wires.