DTC B1572- Revised Immobilizer Antenna Diagnostics – 2017-2019 Subaru Legacy & Outback

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NHTSA ID Number: 10182223

Manufacturer Communication Number: 07-181-20


This Service Information Bulletin provides an important step currently missing from the Service Manual diagnostics for DTC B1572 “IMM CIRCUIT EXCEPT ANTENNA CIRCUIT”.


NUMBER: 07-181-20
DATE: 10/16/20

APPLICABILITY: 2017-19MY Legacy and Outback
SUBJECT: DTC B1572- Revised Immobilizer Antenna Diagnostics



This Service Information Bulletin provides an important step currently missing from the Service Manual diagnostics for DTC B1572 “IMM CIRCUIT EXCEPT ANTENNA CIRCUIT”.  The applicable Service Manuals will be updated with this important information.



REMINDER:  Customer satisfaction and retention starts with performing quality repairs.

When an error occurs during communication between the engine ECM and Immobilizer Unit, DTC

B1572 is recorded in the Engine ECM.  When this occurs, it is CRITICAL to check for any stored DTCs in the Immobilizer system and perform the diagnostics for those stored DTCs BEFORE starting B1572 diagnosis. This very important DTC inspection step is currently missing in the Service Manual.  As a result, unnecessary parts replacement may occur.  Both the NEW and OLD (current, for reference) Service Manual descriptions are supplied below.



  • This change is applicable in the LEGACY/OUTBACK Service Manual, section: IMMOBILIZER (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1572 only.
  • This change is NOT APPLICABLE to section “KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1572”.


6 Affected Products




1 Associated Document

Manufacturer Communications

NUMBER: 07-181-20
DATE: 10/16/20


MC-10182223-0001.pdf 1094.66KB

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