# Service bulletin 18\-240\-26

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.

- Type: Service bulletin
- NHTSA id: 11034237
- Published by NHTSA: 2026\-07\-01
- Manufacturer's number: 18\-240\-26
- Manufacturer's date: 2026\-06\-01
- NHTSA component: ENGINE

## NHTSA's summary

"This bulletin provides a new diagnostic procedure for vehicles equipped with a Denso CP 1, 1.5 and 2.5 head units to provide an enhanced version of the troubleshooting steps for Sound does not come out from the speaker."

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11034237-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11034237-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine

## Vehicles listed

- 2023 to 2026 SUBARU ASCENT
- 2022 to 2026 SUBARU BRZ
- 2024 to 2026 SUBARU CROSSTREK
- 2025 SUBARU FORESTER
- 2024 to 2026 SUBARU IMPREZA
- 2020 to 2025 SUBARU LEGACY
- 2020 to 2025 SUBARU OUTBACK
- 2022 to 2026 SUBARU WRX

## Recalls for the same vehicles and component

- [22V473000](/recalls/nhtsa/22V473000.md), 2022-07-01: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\); ELECTRICAL SYSTEM:WIRING

## Other bulletins for the same vehicles and component

- [09\-141\-26](/bulletins/11037946.md), 2026-10-05, Service bulletin: ENGINE; ELECTRICAL SYSTEM. This Bulletin provides a diagnostic procedure for customer concerns about hesitation, reduced acceleration, or lack of power when driving uphill or under heavy engine load.
- [02\-196\-26R](/bulletins/11036811.md), 2026-09-03, Service bulletin: ENGINE. This service bulletin outlines the diagnostic and repair procedure for white smoke emitted from the exhaust after startup. This is an revised version of the original bulletin.
- [07\-231\-26](/bulletins/11036791.md), 2026-09-03, Service bulletin: ENGINE. This bulletin announces the service procedure for battery replacement on 2025\-2026MY Impreza and Crosstrek.
- [07\-242\-26](/bulletins/11035637.md), 2026-08-04, Service bulletin: ENGINE; STEERING. This bulletin outlines a repair procedure to be performed if DTC B2781 is set in the steering lock control module.
- [02\-193\-24R](/bulletins/11034269.md), 2026-07-02, Service bulletin: ENGINE. This bulletin provides updated parts information and a service procedure to follow for removing accumulated carbon deposits from fuel injectors and internal engine components \(e.g. intake valves and / or manifold, and combustion chambers\). \(This is an revised version of the original bulletin.\)
- [09\-74\-21R](/bulletins/11034264.md), 2026-07-02, Service bulletin: ENGINE; FUEL/PROPULSION SYSTEM. This bulletin provides updated parts information and a service procedure to follow for removing accumulated carbon deposits from fuel injectors and internal engine components \(e.g. intake valves and / or manifold, and combustion chambers\). \(This is an revised version of the original bulletin.\)
- [02\-196\-26](/bulletins/11034257.md), 2026-07-02, Service bulletin: ENGINE. This bulletin outlines the diagnostic and repair procedure for white smoke emitted from the exhaust after startup.
- [18\-243\-26](/bulletins/11034246.md), 2026-07-02, Service bulletin: ENGINE. This bulletin announces the elimination of oil spacers from both left\- and right side camshaft carriers on FB2.5 engines.
- [09\-130\-25R](/bulletins/11034243.md), 2026-07-02, Service bulletin: ENGINE. This bulletin announces the design change made to the exhaust manifold flange nut material that has been changed from stainless steel to medium carbon steel. This change also necessitates a revised tightening torque specification. \(This is an revised version of the original bulletin.\)
- [02\-193\-24R](/bulletins/11033065.md), 2026-06-01, Service bulletin: ENGINE. This bulletin provides updated parts information and a service procedure to follow for removing accumulated carbon deposits from fuel injectors and internal engine components \(e.g. intake valves and / or manifold, and combustion chambers\).

JSON: [/v1/bulletins/11034237](/v1/bulletins/11034237)

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