HVAC Module DTC List
HVAC Module DTC List
| DTC | Description | Action to Take |
|---|---|---|
| B1200 | Stuck Button | Button held too long may set DTC. ATTEMPT to clean buttons. If code returns, INSTALL a new HVAC module. REFER to CLIMATE CONTROL . |
| B1255 | Air Temperature External Sensor Circuit Open | GO to PINPOINT TEST O . |
| B1257 | Air Temperature External Sensor Circuit Short To Ground | GO to PINPOINT TEST O . |
| B12A4 | Mode Door Actuator, Drive Circuit(s) Shorted to Battery Voltage | GO to PINPOINT TEST F . |
| B12A5 | Mode Door Actuator, Feedback Circuit Open or Shorted to Battery Voltage | GO to PINPOINT TEST F . |
| B12A6 | Mode Door Actuator, Feedback Circuit Shorted to Ground | GO to PINPOINT TEST F . |
| B12A7 | Mode Door Actuator, Slow or Door Obstructed | GO to PINPOINT TEST F . |
| B12A8 | Recirc Door Actuator, Drive Circuit(s) Open or Shorted to Ground | GO to PINPOINT TEST E . |
| B12A9 | Recirc Door Actuator, Drive Circuit(s) Shorted to Battery Voltage | GO to PINPOINT TEST E . |
| B12AA | Recirc Door Actuator, Slow or Door Obstructed | GO to PINPOINT TEST E . |
| B12AF | Front Blower Motor Relay Drive Circuit Shorted to Battery Voltage | GO to PINPOINT TEST L . |
| B12B0 | Front Blower Motor Relay Drive Circuit Open or Shorted to Ground | If the blower motor is inoperative, GO to PINPOINT TEST L
. If the blower motor is always on, REPAIR circuit CH123 (VT/GN) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. |
| B12B3 | Blend Door Actuator, Drive Circuit(s) Shorted to Battery Voltage | GO to PINPOINT TEST K . |
| B12B5 | Blend Door Actuator, Feedback Circuit Open or Shorted to Battery Voltage | GO to PINPOINT TEST K . |
| B12B6 | Blend Door Actuator, Feedback Circuit Shorted to Ground | GO to PINPOINT TEST K . |
| B12B7 | Blend Door Actuator, Slow or Door Obstructed | GO to PINPOINT TEST K . |
| B12B9 | Vref (5V) Drive Circuit Shorted to Battery Voltage | REPAIR circuit LH111 (BN/WH) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. |
| B12BA | Vref (5V) Drive Circuit Shorted to Ground | REPAIR circuit LH111 (BN/WH) for a short to ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. |
| B1342 | Module is Faulted | INSTALL a new HVAC module. REFER to CLIMATE CONTROL . |
| B1676 | Battery Voltage Out of Range | GO to PINPOINT TEST N . |
| B2826 | Front Evaporator Temp Sensor Circuit Failure | GO to PINPOINT TEST C . |
| B2827 | Front Evaporator Temp Sensor Short to Ground | GO to PINPOINT TEST C . |
| B297A | Blend Door Actuator, Drive Circuit(s) Open | GO to PINPOINT TEST K . |
| B297B | Blend Door Actuator, Drive Circuit(s) Shorted to Ground | GO to PINPOINT TEST K . |
| B298A | Mode Door Actuator, Drive Circuit(s) Open | GO to PINPOINT TEST F . |
| B298B | Mode Door Actuator, Drive Circuit(s) Shorted to Ground | GO to PINPOINT TEST F . |
| U0140 | Lost Communication With Generic Electronic Module (GEM) | CLEAR The DTCs. REPEAT the self-test. If the DTC returns, REFER to MODULE COMMUNICATIONS NETWORK to diagnose the lost communication with the Smart Junction Box (SJB). |
| U2050 | No Application Present | INSTALL a new HVAC module. REFER to CLIMATE CONTROL . |
| All Other DTCs | - | REFER to the Master DTC Chart in MULTIFUNCTION ELECTRONIC MODULES . |