DTC P1571 Reference Code Incompatibility: DTC Detecting Condition

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Reference code incompatibility between body integrated unit and ECM

DIAGNOSTIC PROCEDURE CHART

Step	Check	Yes	No
1 PERFORM IGNITION KEY REGISTRATION. Perform registration to all keys used for the vehicle. Refer to the PC application help for Subaru Select Monitor.	Is registration of all keys complete?	End.	Go to step 2 .
2 CHECK FOR ANY OTHER DTC ON DISPLAY.	Is any other immobilizer DTC displayed?	Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . > Execute the registration procedure next. Refer to the PC application help for Subaru Select Monitor.	Replace the ECM. < Refer to ENGINE CONTROL MODULE (ECM) . > Replace the body integrated unit < Refer to BODY INTEGRATED UNIT . > and register all ignition keys (transponders). Refer to the PC application help for Subaru Select Monitor.