DTC U0100: Gauge Control Module Lost Communication with ECM/PCM
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)
- 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 DTC's 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 to LOCK (0) and then back to ON (II)
- 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 -Replace the ECM/PCM (see ECM/PCM REPLACEMENT )
NO -The original gauge control module is faulty, replace it (see GAUGE CONTROL MODULE REPLACEMENT )