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.
2016 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
HVAC System DTCS
| DTC | Item | Description |
|---|---|---|
| B1430 | In-Vehicle (Post Evaporator) Temperature Sensor Circuit Open | < Ref. to DTC B1430 IN-VEHICLE (POST EVAPORATOR) TEMPERATURE SENSOR CIRCUIT OPEN , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B1431 | In-Vehicle (Post Evaporator) Temperature Sensor Circuit Short-Circuit | < Ref. to DTC B1431 IN-VEHICLE (POST EVAPORATOR) TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B1432 | Ambient Temperature Sensor Circuit Open (Air-Conditioner) | < Ref. to DTC B1432 AMBIENT TEMPERATURE SENSOR CIRCUIT OPEN (AIR-CONDITIONER) , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B1433 | Ambient Temperature Sensor Circuit Short-Circuit (Air-Conditioner) | < Ref. to DTC B1433 AMBIENT TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT (AIR-CONDITIONER) , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B1434 | Evaporator Temperature Sensor Circuit Open | < Ref. to DTC B1434 EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B1435 | Evaporator Temperature Sensor Circuit Short-Circuit | < Ref. to DTC B1435 EVAPORATOR TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B14A1 | Sunload Sensor Circuit Low/Open | < Ref. to DTC B14A1 SUNLOAD SENSOR CIRCUIT LOW/OPEN , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B14A2 | Sunload Sensor Circuit Short-Circuit | < Ref. to DTC B14A2 SUNLOAD SENSOR CIRCUIT SHORT-CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B14E1 | Air Mix Door Actuator Stepping Motor Circuit Open (Driver) | < Ref. to DTC B14E1 AIR MIX DOOR ACTUATOR STEPPING MOTOR CIRCUIT OPEN (DRIVER) , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B14E2 | Air Mix Door Actuator Stepping Motor Circuit Short-Circuit (Driver) | < Ref. to DTC B14E2 AIR MIX DOOR ACTUATOR STEPPING MOTOR CIRCUIT SHORT-CIRCUIT (DRIVER) , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B14E3 | Air Mix Door Actuator Stepping Motor Circuit Open (Passenger) | < Ref. to DTC B14E3 AIR MIX DOOR ACTUATOR STEPPING MOTOR CIRCUIT OPEN (PASSENGER) , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B14E4 | Air Mix Door Actuator Stepping Motor Circuit Short-Circuit (Passenger) | < Ref. to DTC B14E4 AIR MIX DOOR ACTUATOR STEPPING MOTOR CIRCUIT SHORT-CIRCUIT (PASSENGER) , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B14E5 | Mode Door Actuator Stepping Motor Circuit Open | < Ref. to DTC B14E5 MODE DOOR ACTUATOR STEPPING MOTOR CIRCUIT OPEN , 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 Circuit Open | < Ref. to DTC B14E9 INTAKE DOOR ACTUATOR CIRCUIT OPEN , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B14EA | Intake Door Actuator Circuit Short-Circuit | < Ref. to DTC B14EA INTAKE DOOR ACTUATOR CIRCUIT SHORT-CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B14EB | Intake Door Actuator Stuck | < Ref. to DTC B14EB INTAKE DOOR ACTUATOR STUCK , 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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