DTC U0122: Gauge Control Module Lost Communication with VSA Modulator-Control Unit (VSA message)
- 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 )
- If the HDS does not communicate with the VSA modulator-control unit, the VSA indicator stay on, and no VSA DTCs are stored, go to symptom troubleshooting for ABS indicator, brake system indicator, and VSA indicator do not go off, and no DTCs are stored (see ABS INDICATOR, BRAKE SYSTEM INDICATOR, AND VSA INDICATOR DO NOT GO OFF )
- Clear the DTCs with the HDS
- Turn the ignition switch to LOCK (0) and then back to ON (II)
- Wait for 6 seconds or more
- Check for DTCs with the HDS
Is DTC U0122 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 and the VSA modulator-control unit with the HDS If F-CAN DTCs are present, check for a loose VSA ground or poor connections at the VSA modulator-control unit or gauge control module If the connections are good, check the battery condition and the charging system, then clear all DTCs
- Check for DTCs in the ECM/PCM or VSA with the HDS
Are any DTCs indicated?
YES -Go to the ECM/PCM or VSA 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 to LOCK (0) and then back to ON (II)
- Check for DTCs with the HDS
Is DTC U0122 indicated?
YES -Recheck ECM/PCM for DTCs, then recheck the VSA modulator-control unit for DTCs
NO -The original gauge control module is faulty, replace it (see GAUGE CONTROL MODULE REPLACEMENT )