HVAC Module DTC Chart
HVAC MODULE DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Action to Take |
|---|---|---|
| B1251 | Air Temperature Internal Sensor Circuit Open | GO to PINPOINT TEST A . |
| B1253 | Air Temperature Internal Sensor Circuit Short to Ground | GO to PINPOINT TEST A . |
| B2783 | Interior Humidity Sensor to DATC Short Circuit | GO to PINPOINT TEST B . |
| B2784 | Interior Humidity Sensor to DATC Open Circuit | GO to PINPOINT TEST B . |
| B1255 | Air Temperature External Sensor Circuit Open | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B1257 | Air Temperature External Sensor Circuit Short to Ground | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B129B | Driver Blend Door Actuator, Drive Circuit(s) Shorted to Battery Voltage | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B129C | Driver Blend Door Actuator, Feedback Circuit Open or Shorted to Battery Voltage | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B129D | Driver Blend Door Actuator, Feedback Circuit Shorted to Ground | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B129F | Passenger Blend Door Actuator, Drive Circuit(s) Shorted to Battery Voltage | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B12A0 | Passenger Blend Door Actuator, Feedback Circuit Open or Shorted to Battery Voltage | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B12A1 | Passenger Blend Door Actuator, Feedback Circuit Shorted to Ground | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B12A2 | Passenger Blend Door Actuator, Slow or Door Obstructed | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B12A4 | Mode Door Actuator, Drive Circuit(s) Shorted to Battery Voltage | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B12A5 | Mode Door Actuator, Feedback Circuit Open or Shorted to Battery Voltage | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B12A6 | Mode Door Actuator, Feedback Circuit Shorted to Ground | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B12A7 | Mode Door Actuator, Slow or Door Obstructed | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B12A9 | Recirc Door Actuator, Drive Circuit(s) Shorted to Battery Voltage | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B12AF | Front Blower Motor Relay Drive Circuit Shorted to Battery Voltage | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B12B0 | Front Blower Motor Relay Drive Circuit Open or Shorted to Ground | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B12B1 | Front Blower Motor PWM Drive Circuit Shorted to Battery Voltage | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B12B2 | Front Blower Motor PWM Drive Circuit Open or Shorted to Ground | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B12B8 | Driver Blend Door Actuator, Slow or Door Obstructed | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B12B9 | Vref (5V) Drive Circuit Shorted to Battery Voltage | REPAIR circuit LH111 (BNAVH) 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 (BNAVH) 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 | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B2426 | Passenger Solar Radiation Sensor Circuit Open | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B2427 | Passenger Solar Radiation Sensor Circuit Short to Ground | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B2477 | Module Configuration Failure | INSTALL a new HVAC module. REFER to CLIMATE CONTROL . |
| B2795 | Driver Solar Radiation Sensor Circuit Short to Ground | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B2796 | Driver Solar Radiation Sensor Circuit Open | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B2826 | Front Evaporator Temp Sensor Circuit Failure | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B2827 | Front Evaporator Temp Sensor Short to Ground | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B297B | Blend Door Actuator, Drive Circuit(s) Shorted to Ground | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B297C | Driver Blend Door Actuator, Drive Circuit(s) Open | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B297D | Driver Blend Door Actuator, Drive Circuit(s) Shorted to Ground | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B297E | Passenger Blend Door Actuator, Drive Circuit(s) Open | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B297F | Passenger Blend Door Actuator, Drive Circuit(s) Shorted to Ground | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B298A | Mode Door Actuator, Drive Circuit(s) Open | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B298B | Mode Door Actuator, Drive Circuit(s) Shorted to Ground | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B298C | Recirc Door Actuator, Drive Circuit(s) Open | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| B298D | Recirc Door Actuator, Drive Circuit(s) Shorted to Ground | REFER to CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS . |
| 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 GEM. |
| U0300 | Internal Control Module Software Incompatibility | INSTALL a new HVAC module. REFER to CLIMATE CONTROL . |
| U2050 | No Application Present | INSTALL a new HVAC module. REFER to CLIMATE CONTROL . |
| U2051 | One or More Calibration Files Missing/Corrupt | INSTALL a new HVAC module. REFER to CLIMATE CONTROL . |
| All Other DTCs | - | REFER to the Master DTC Chart in MULTIFUNCTION ELECTRONIC MODULES . |