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
Keyless Access System
KEYLESS ACCESS SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Item | Description |
|---|---|---|
| U0073 | Control Module Communication Bus Off | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0100 | Lost Communication With ECM/PCM "A" | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0101 | Lost Communication With TCM | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0122 | Lost Communication With Vehicle Dynamics Control Module | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0140 | Lost Communication With Body Control Module | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0155 | Lost Communication With Instrument Panel Cluster (IPC) Control Module | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0401 | Invalid Data Received From ECM/PCM "A" | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| U0422 | Invalid Data Received From Body Control Module | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B1242 | Wireless Tuner Abnormal | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2271 | IGN Fuse Blown or IGN Circuit Abnormal | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2274 | ACC Monitor | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2275 | STSW Circuit Abnormal | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2276 | ACCR Signal Abnormal | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2277 | Submerging Circuit Abnormal | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2282 | Vehicle Speed Signal Abnormal | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2283 | Vehicle Speed Sensor Fault Detection | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2284 | Brake Signal (Cable-Information Does Not Match to Bean-Information) | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2285 | Steering Lock Position Signal Abnormal | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2286 | Driving Possible Signal Abnormal | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2779 | Remote Control Engine Starter Communication Collation NG | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2781 | Steering Lock ECU Open/Short | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2782 | Steering Lock Power Supply Circuit Abnormal (Smart ECU-Side Abnormal) | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2784 | Antenna Coil Fault | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2785 | LIN Communication Error | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2786 | No Response From Steering Lock ECU | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2788 | IGN1 Input Abnormal | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2789 | ID Code Box No Response | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B278A | Abnormal Immobilizer Power Supply | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B278D | ID Code Box Recognition Judgment Abnormal | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2790 | ID Code Box Abnormal (EEPROM Abnormal) | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B27A1 | Driver Side External Antenna Output Stage Open | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B27A2 | Passenger Side External Antenna Output Stage Open | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B27A5 | Front Internal Antenna Output Stage Open | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B27A6 | Rear Internal Antenna Output Stage Open | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B27A7 | Trunk/Rear Gate Internal Antenna Output Stage Open | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B27A8 | Trunk/Rear Gate External Antenna Output Stage Open | <Ref. to , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
Factory Service Tools
Use the Manual With the Right Hardware
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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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