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 STIFACTORY OEM SERVICE PROCEDURE
Telematics System
TELEMATICS SYSTEM DIAGNOSTIC TROUBLE CODE IDENTIFICATION
| DTC | Item | Note |
|---|---|---|
| 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).> |
| 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).> |
| U0151 | LOST COMMUNICATION WITH RESTRAINTS CONTROL MODULE | <Ref. to DTC U0151 LOST COMMUNICATION WITH RESTRAINTS 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).> |
| 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).> |
| U0452 | INVALID DATA RECEIVED FROM RESTRAINTS CONTROL MODULE | <Ref. to DTC U0452 INVALID DATA RECEIVED FROM RESTRAINTS CONTROL MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2A00 | VIN READING | <Ref. to DTC B2A00 VIN READING , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2A01 | LTE1 ANTENNA CIRCUIT | <Ref. to DTC B2A01 LTE1 ANTENNA CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2A02 | LTE2 ANTENNA CIRCUIT | <Ref. to DTC B2A02 LTE2 ANTENNA CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2A03 | GPS ANTENNA CIRCUIT | <Ref. to DTC B2A03 GPS ANTENNA CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2A04 | MIC CIRCUIT | <Ref. to DTC B2A04 MIC CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2A05 | LEFT SPEAKER/AUDIO CIRCUIT | <Ref. to DTC B2A05 LEFT SPEAKER/AUDIO CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2A06 | RIGHT SPEAKER/AUDIO CIRCUIT | <Ref. to DTC B2A06 RIGHT SPEAKER/AUDIO CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2A07 | BACKUP BATTERY CHARGE SYSTEM PERFORMANCE | <Ref. to DTC B2A07 BACKUP BATTERY CHARGE SYSTEM PERFORMANCE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2A08 | SOS BUTTON CIRCUIT | <Ref. to DTC B2A08 SOS BUTTON CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2A09 | I-CALL BUTTON CIRCUIT | <Ref. to DTC B2A09 I-CALL BUTTON CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2A0A | RED LED CIRCUIT | <Ref. to DTC B2A0A RED LED CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2A0B | GREEN LED CIRCUIT | <Ref. to DTC B2A0B GREEN LED CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2A0C | DCM INTERNAL FAULT | <Ref. to DTC B2A0C DCM INTERNAL FAULT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2A0D | AIRBAG SIGNAL | <Ref. to DTC B2A0D AIRBAG SIGNAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2A0E | MUTE LINE CIRCUIT | <Ref. to DTC B2A0E MUTE LINE CIRCUIT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2A0F | BACKUP BATTERY DEGRADATION | <Ref. to DTC B2A0F BACKUP BATTERY DEGRADATION , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> |
| B2A10 | BATTERY VOLTAGE HIGH | <Ref. to DTC B2A10 BATTERY VOLTAGE HIGH , 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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