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.
2023 Subaru WRX Base, Standard TransFACTORY OEM SERVICE PROCEDURE
Engine Control System
IMMOBILIZER SYSTEM (ENGINE CONTROL SYSTEM) DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description | Reference |
|---|---|---|
| B1571 | REFERENCE CODE INCOMPATIBILITY (IMMOBILIZER CM TO ECM) | Ref. to IMMOBILIZER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1571 REFERENCE CODE INCOMPATIBILITY (IMMOBILIZER CM TO ECM) . |
| B1572 | IMM CIRCUIT EXCEPT ANTENNA CIRCUIT | Ref. to IMMOBILIZER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1572 IMM CIRCUIT EXCEPT ANTENNA CIRCUIT . |
| B1576 | ECM EEPROM | Ref. to IMMOBILIZER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1576 EGI CONTROL MODULE EEPROM . |
| B1577 | IMMOBILIZER CM EEPROM | Ref. to IMMOBILIZER (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC B1577 IMM CONTROL MODULE EEPROM . |
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.