HVAC Module
HVAC MODULE DIAGNOSTIC TROUBLE CODE (DTC) LIST - EXCEPT HYBRID
| 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 article. |
| B1251 | Air Temperature Internal Sensor Circuit Open | GO to PINPOINT TEST C . |
| B1253 | Air Temperature Internal Sensor Circuit Short To Ground | GO to PINPOINT TEST C . |
| B1255 | Air Temperature External Sensor Circuit Open | GO to PINPOINT TEST D . |
| B1257 | Air Temperature External Sensor Circuit Short To Ground | GO to PINPOINT TEST D . |
| B129B | Driver Blend Door Actuator, Drive Circuit(s) Shorted to Battery Voltage | GO to PINPOINT TEST N . |
| B129C | Driver Blend Door Actuator, Feedback Circuit Open or Shorted to Battery Voltage | GO to PINPOINT TEST N . |
| B129D | Driver Blend Door Actuator, Feedback Circuit Shorted to Ground | GO to PINPOINT TEST N . |
| B129F | Passenger Blend Door Actuator, Drive Circuit(s) Shorted to Battery Voltage | GO to PINPOINT TEST N . |
| B12A0 | Passenger Blend Door Actuator, Feedback Circuit Open or Shorted to Battery Voltage | GO to PINPOINT TEST N . |
| B12A1 | Passenger Blend Door Actuator, Feedback Circuit Shorted to Ground | GO to PINPOINT TEST N . |
| B12A2 | Passenger Blend Door Actuator, Slow or Door Obstructed | GO to PINPOINT TEST N . |
| B12A4 | Mode Door Actuator, Drive Circuit(s) Shorted to Battery Voltage | GO to PINPOINT TEST I . |
| B12A5 | Mode Door Actuator, Feedback Circuit Open or Shorted to Battery Voltage | GO to PINPOINT TEST I . |
| B12A6 | Mode Door Actuator, Feedback Circuit Shorted to Ground | GO to PINPOINT TEST I . |
| B12A7 | Mode Door Actuator, Slow or Door Obstructed | GO to PINPOINT TEST I . |
| B12A9 | Recirc Door Actuator, Drive Circuit(s) Shorted to Battery Voltage | GO to PINPOINT TEST H . |
| B12AF | Front Blower Motor Relay Drive Circuit Shorted to Battery Voltage | For EMTC
systems, GO to PINPOINT TEST O
. For DATC systems, GO to PINPOINT TEST Q . |
| B12B0 | Front Blower Motor Relay Drive Circuit Open or Shorted to Ground | For EMTC
systems, if the blower motor is inoperative, GO to PINPOINT TEST O
. For EMTC systems, 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. For DATC systems, if the blower motor is inoperative, GO to PINPOINT TEST Q . For DATC systems, if the blower motor relay 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. |
| B12B1 | Front Blower Motor PWM Drive Circuit Shorted to Battery Voltage | GO to PINPOINT TEST R . |
| B12B2 | Front Blower Motor PWM Drive Circuit Open or Shorted to Ground | GO to PINPOINT TEST Q . |
| B12B3 | Blend Door Actuator, Drive Circuit(S) Shorted to Battery Voltage | GO to PINPOINT TEST N . |
| B12B5 | Blend Door Actuator, Feedback Circuit Open or Shorted to Battery Voltage | GO to PINPOINT TEST N . |
| B12B6 | Blend Door Actuator, Feedback Circuit Shorted to Ground | GO to PINPOINT TEST N . |
| B12B7 | Blend Door Actuator, Slow or Door Obstructed | GO to PINPOINT TEST N . |
| B12B8 | Driver Blend Door Actuator, Slow or Door Obstructed | GO to PINPOINT TEST N . |
| 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 article. |
| B1676 | Battery Voltage Out of Range | GO to PINPOINT TEST S . |
| B2426 | Passenger Solar Radiation Sensor Circuit Open | GO to PINPOINT TEST E . |
| B2427 | Passenger Solar Radiation Sensor Circuit Short to Ground | GO to PINPOINT TEST E . |
| B2477 | Module Configuration Failure | INSTALL a new HVAC module. REFER to CLIMATE CONTROL article. |
| B2795 | Driver Solar Radiation Sensor Circuit Short to Ground | GO to PINPOINT TEST E . |
| B2796 | Driver Solar Radiation Sensor Circuit Open | GO to PINPOINT TEST E . |
| B2826 | Front Evaporator Temp Sensor Circuit Failure | GO to PINPOINT TEST F . |
| B2827 | Front Evaporator Temp Sensor Short to Ground | GO to PINPOINT TEST F . |
| B297A | Blend Door Actuator, Drive Circuit(s) Open | GO to PINPOINT TEST N . |
| B297B | Blend Door Actuator, Drive Circuit(s) Shorted to Ground | GO to PINPOINT TEST N . |
| B297C | Driver Blend Door Actuator, Drive Circuit(s) Open | GO to PINPOINT TEST N . |
| B297D | Driver Blend Door Actuator, Drive Circuit(s) Shorted to Ground | GO to PINPOINT TEST N . |
| B297E | Passenger Blend Door Actuator, Drive Circuit(s) Open | GO to PINPOINT TEST N . |
| B297F | Passenger Blend Door Actuator, Drive Circuit(s) Shorted to Ground | GO to PINPOINT TEST N . |
| B298A | Mode Door Actuator, Drive Circuit(s) Open | GO to PINPOINT TEST I . |
| B298B | Mode Door Actuator, Drive Circuit(s) Shorted to Ground | GO to PINPOINT TEST I . |
| B298C | Recirc Door Actuator, Drive Circuit(s) Open | GO to PINPOINT TEST H . |
| B298D | Recirc Door Actuator, Drive Circuit(s) Shorted to Ground | GO to PINPOINT TEST H . |
| U0140 | Lost Communication With Body Control Module (GEM) | CLEAR The DTCs. REPEAT the self-test. If the DTC returns, REFER to MODULE COMMUNICATIONS NETWORK article to diagnose the lost communication with the GEM. |
| U0300 | Internal Control Module Software Incompatibility | INSTALL a new HVAC module. REFER to CLIMATE CONTROL article. |
| U2050 | No Application Present | INSTALL a new HVAC module. REFER to CLIMATE CONTROL article. |
| U2051 | One or More Calibration Files Missing / Corrupt | INSTALL a new HVAC module. REFER to CLIMATE CONTROL article. |
| All Other DTCs | - | REFER to the Master DTC Chart in MULTIFUNCTION ELECTRONIC MODULE article. |