DTC B1571: Reference Code Incompatibility

DTC detecting condition: 

Incompatibility of reference code between keyless access CONTROL MODULE (model without ID code box) or ID code box (model with ID code box) and ECM occurs.

Trouble symptom: 

Engine will not start.

1. CHECK ECM  .

   Perform ECM registration. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume. Contact an Authorized Subaru Dealership.

   Is ECM registration finished? And does the engine start?

   Yes: ECM registration was not performed properly.

   No: Go to  2

2. REPLACE ECM  .
   1. Install the ECM from other normal operating vehicle (with push button start) which use same ECM to the vehicle to be diagnosed.
   2. Perform ECM registration. Refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume. Contact an Authorized Subaru Dealership.

   Is ECM registration finished? And does the engine start?

   Yes: Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (EXCEPT FOR STI)>Engine Control Module (ECM)>REMOVAL . Ref. to FUEL INJECTION (FUEL SYSTEMS) (STI)>Engine Control Module (ECM)>REMOVAL Install the ECM from other vehicle to the original vehicle.

   No: Replace Keyless access CONTROL MODULE (model without ID code box), Ref. to SECURITY AND LOCKS>Keyless Access CONTROL MODULE or replace ID code box (model with ID code box). Ref. to SECURITY AND LOCKS>ID Code Box>NOTE