Auxiliary Heater Control Module (AHCM)
AUXILIARY HEATER CONTROL MODULE (AHCM) DTC CHART
| DTC | Description | Action to Take |
|---|---|---|
| B1317 | Battery Voltage High | GO to PINPOINT TEST R . |
| B1318 | Battery Voltage Low | GO to PINPOINT TEST R . |
| B1342 | ECU Is Faulted | INSTALL a new electric heater. REFER to CLIMATE CONTROL . TEST the system for normal operation. |
| U0100 | Lost Communication with ECM/PCM | CLEAR the DTCs. REPEAT the self-test. If the DTC returns, REFER to MODULE COMMUNICATIONS NETWORK to diagnose the lost communication with the PCM. |
| U0140 | Lost Communication With Body Control Module | This DTC can set because the BCM is unable to communicate with the AHCM over the CAN bus. CARRY OUT a self-test of the BCM. If the scan tool indicates that the BCM is not responding, REFER to MODULE COMMUNICATIONS NETWORK to diagnose the network communication concern. If BCM DTCs are present, REFER to MULTIFUNCTION ELECTRONIC MODULES . |