DTC U0100: Gauge Control Module Lost Communication With ECM/PCM
- Clear the DTCs with the HDS.
- Turn the ignition switch to LOCK (0) and then back to ON (II), or press the engine start/stop button to select the OFF mode and then the ON mode.
- Start and run the engine for at least 5 seconds, then turn the engine off.
- Check for DTCs with the HDS.
Is DTC U0100 indicated?
YES -Go to step 5.
NO -Intermittent failure, the F-CAN communication line is OK at this time. Check for DTCs in the ECM/PCM with the HDS. If F-CAN DTCs are present, check for loose or poor connections at the gauge control module and the ECM/PCM. If the connections are good, check the battery condition and the charging system, then clear all DTCs.
- Check for DTCs in the ECM/PCM with the HDS.
Are any DTCs indicated?
YES -Go to the ECM/PCM indicated DTCS TROUBLESHOOTING , then recheck.
NO -Go to step 6.
- Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
- Short the SCS line with the HDS.
- Disconnect ECM/PCM connector A (49P).
- Check for continuity between gauge control module 32P connector terminals No. 13 and No. 14 and ECM/PCM connector A (49P) terminals No. 49 and No. 48 respectively.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), and recheck. If the indication goes away, replace the original ECM/PCM. If the DTC is still present, replace the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ).
NO -Repair an open or poor connection in the wire between the ECM/PCM and the gauge control module.