Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2015 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
HVAC System DTCS
HVAC SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Item | Description |
|---|---|---|
| B1430 | Room Temperature Sensor Circuit Wire Break | <Ref. to DTC B1430 ROOM TEMPERATURE SENSOR CIRCUIT WIRE BREAK , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B1431 | Room Temperature Sensor Circuit Short-Circuit | <Ref. to DTC B1431 ROOM TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B1432 | Outside Air Sensor Circuit Wire Break (Air-Conditioning) | <Ref. to DTC B1432 OUTSIDE AIR SENSOR CIRCUIT WIRE BREAK (AIR-CONDITIONING) , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B1433 | Outside Air Sensor Circuit Short-Circuit (Air-Conditioning) | <Ref. to DTC B1433 OUTSIDE AIR SENSOR CIRCUIT SHORT-CIRCUIT (AIR-CONDITIONING) , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B1434 | Ambient Temperature Sensor Circuit Wire Break | <Ref. to DTC B1434 AMBIENT TEMPERATURE SENSOR CIRCUIT WIRE BREAK , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B1435 | Evaporator Sensor Circuit Short-Circuit | <Ref. to DTC B1435 EVAPORATOR SENSOR CIRCUIT SHORT-CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B14A1 | Sunload Sensor Circuit Open | <Ref. to DTC B14A1 SUNLOAD SENSOR CIRCUIT OPEN , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B14A2 | Sunload Sensor Circuit Short | <Ref. to DTC B14A2 SUNLOAD SENSOR CIRCUIT SHORT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B14E1 | Air Mix Door Actuator Stepping Motor Circuit Wire Break (Driver's Seat) | <Ref. to DTC B14E1 AIR MIX DOOR ACTUATOR STEPPING MOTOR CIRCUIT WIRE BREAK (DRIVER'S SEAT) , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B14E2 | Air Mix Door Actuator Stepping Motor Circuit Short-Circuit (Driver's Seat) | <Ref. to DTC B14E2 AIR MIX DOOR ACTUATOR STEPPING MOTOR CIRCUIT SHORT-CIRCUIT (DRIVER'S SEAT) , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B14E3 | Air Mix Door Actuator Stepping Motor Circuit Wire Break (Passenger's Seat) | <Ref. to DTC B14E3 AIR MIX DOOR ACTUATOR STEPPING MOTOR CIRCUIT WIRE BREAK (PASSENGER'S SEAT) , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B14E4 | Air Mix Door Actuator Stepping Motor Circuit Short-Circuit (Passenger's Seat) | <Ref. to DTC B14E4 AIR MIX DOOR ACTUATOR STEPPING MOTOR CIRCUIT SHORT-CIRCUIT (PASSENGER'S SEAT) , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B14E5 | Mode Door Actuator Stepping Motor Circuit Wire Break | <Ref. to DTC B14E5 MODE DOOR ACTUATOR STEPPING MOTOR CIRCUIT WIRE BREAK , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B14E6 | Mode Door Actuator Stepping Motor Circuit Short-Circuit | <Ref. to DTC B14E6 MODE DOOR ACTUATOR STEPPING MOTOR CIRCUIT SHORT-CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B14E9 | Intake Door Actuator Potentiometer Circuit Wire Break | <Ref. to DTC B14E9 INTAKE DOOR ACTUATOR POTENTIOMETER CIRCUIT WIRE BREAK , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B14EA | Intake Door Actuator Potentiometer Circuit Short-Circuit | <Ref. to DTC B14EA INTAKE DOOR ACTUATOR POTENTIOMETER CIRCUIT SHORT-CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B14EB | Intake Door Actuator Lock | <Ref. to DTC B14EB INTAKE DOOR ACTUATOR LOCK , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0073 | Control Module Communication Bus Off | <Ref. to DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0100 | Lost Communication With ECM/PCM "A" | <Ref. to DTC U0100 LOST COMMUNICATION WITH ECM/PCM "A" , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0101 | Lost Communication With TCM | <Ref. to DTC U0101 LOST COMMUNICATION WITH TCM , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0122 | Lost Communication With Vehicle Dynamics Control Module | <Ref. to DTC U0122 LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0140 | Lost Communication With Body Control Module | <Ref. to DTC U0140 LOST COMMUNICATION WITH BODY CONTROL MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0155 | Lost Communication With Instrument Panel Cluster (IPC) Control Module | <Ref. to DTC U0155 LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0401 | Invalid Data Received From ECM/PCM "A" | <Ref. to DTC U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0402 | Invalid Data Received From TCM | <Ref. to DTC U0402 INVALID DATA RECEIVED FROM TCM , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0416 | Invalid Data Received From Vehicle Dynamics Control Module | <Ref. to DTC U0416 INVALID DATA RECEIVED FROM VEHICLE DYNAMICS CONTROL MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0422 | Invalid Data Received From Body Control Module | <Ref. to DTC U0422 INVALID DATA RECEIVED FROM BODY CONTROL MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0423 | Invalid Data Received From Instrument Panel Cluster Control Module | <Ref. to DTC U0423 INVALID DATA RECEIVED FROM INSTRUMENT PANEL CLUSTER CONTROL MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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