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.
2017 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
Blind Spot Detection System
BLIND SPOT DETECTION SYSTEM DIAGNOSTIC TROUBLE CODE IDENTIFICATION
| DTC | Item | Reference |
|---|---|---|
| B2300 | Rear Radar Circuit Low | <Ref. to DTC B2300 REAR RADAR CIRCUIT LOW , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2301 | Rear Radar Circuit High | <Ref. to DTC B2301 REAR RADAR CIRCUIT HIGH , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2304 | Rear Radar On-Off Switch Stuck | <Ref. to
DTC B2304 REAR RADAR ON-OFF SWITCH STUCK
, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
NOTE:
Only radar sensor LH (master) is detected.
|
| B2311 | Rear Radar Detect TCM | <Ref. to DTC B2311 REAR RADAR DETECT TCM , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2313 | Rear Radar Detect VDC | <Ref. to DTC B2313 REAR RADAR DETECT VDC , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2327 | Rear Radar Internal Failure (Internal Electric Circuit) | <Ref. to DTC B2327 REAR RADAR INTERNAL FAILURE (INTERNAL ELECTRIC CIRCUIT) , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2329 | Rear Radar Axis Alignment Incomplete | <Ref. to DTC B2329 REAR RADAR AXIS ALIGNMENT INCOMPLETE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2350 | Rear Radar Communication Error Between Master And Slave | <Ref. to DTC B2350 REAR RADAR COMMUNICATION ERROR BETWEEN MASTER AND SLAVE , 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).> |
| U0074 | Control Module Communication Bus "BODY-CAN" Off | <Ref. to DTC U0074 CONTROL MODULE COMMUNICATION BUS "BODY-CAN" 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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