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Service bulletin 09-104-23R

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10244897
Published by NHTSA2023-11-06
Manufacturer's number09-104-23R
Manufacturer's date2023-10-12
NHTSA componentENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)

NHTSA's summary

This bulletin announces availability of reprogramming files for the Engine Control Module (ECM) to address rare cases of DTCs P0011 (“A” Camshaft Position – Timing Over-Advanced or System Performance Bank 1) and P0021 (“A” Camshaft Position – Timing Over-Advanced or System Performance Bank 2) detected by the ECM. The new files contain enhanced logic to optimize the detection parameters of DTCs P0011 & P0023.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system, Engine, Engine control module

Trouble codes named

P0011, P0021, P0023

Vehicles listed
SUBARU FORESTER2023

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
09-104-232023-06-05. Service bulletin. This bulletin announces availability of reprogramming files for the Engine Control Module (ECM) to address rare cases of DTCs P0011 (“A” Camshaft Position – Timing Over-Advanced or System Performance Bank 1) and P0021 (“A” Camshaft Position – Timing Over-Advanced or System Performance Bank 2) detected by the ECM.