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Service bulletin 15-236-18R

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 id10238443
Published by NHTSA2023-07-03
Manufacturer's number15-236-18R
Manufacturer's date2023-06-06
NHTSA componentEQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM); ELECTRICAL SYSTEM:SOFTWARE; ELECTRICAL SYSTEM

NHTSA's summary

The following information addresses reprogramming file availability and a software update installation procedure to provide optimization to the new Harman Gen 3.1 Audio and Navigation head units utilized in the models as listed.

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, Equipment and accessories, Software

Vehicles listed
SUBARU ASCENT2019, 2020, 2021, 2022
SUBARU BRZ2019, 2020, 2021
SUBARU CROSSTREK2019, 2020, 2021, 2022, 2023
SUBARU FORESTER2019, 2020, 2021, 2022, 2023
SUBARU IMPREZA2019, 2020, 2021, 2022, 2023
SUBARU LEGACY2019
SUBARU OUTBACK2019
SUBARU WRX2019, 2020, 2021
SUBARU WRX STI2019, 2020, 2021 (the catalog's model; the bulletin names a series or trim of it)

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

Recalls for the same vehicles and component
21V2640002021-04-15. ELECTRICAL SYSTEM:SOFTWARE; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE; ELECTRICAL SYSTEM:IGNITION; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE
19V7430002019-10-18. ELECTRICAL SYSTEM:SOFTWARE; ELECTRICAL SYSTEM:IGNITION

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
07-222-23R2023-09-05. Service bulletin. This bulletin announces the availability of new reprogramming files developed to address rare cases of changes made to the climate control settings without any activation from the driver or passenger.
16-139-222022-08-02. Service bulletin. The WRK-21 recall includes TCM reprogramming to prevent CVT chain slip. If, during the recall inspection, a vehicle is confirmed to have already experienced severe enough CVT chain slip, the CVT assembly will be replaced.
15-246-19R2022-02-04. Service bulletin. This bulletin outlines a new required procedure to follow when performing immobilizer-related repairs on the 2020-22 Legacy and Outback.
Subaru Starlink2020-10-05. Service bulletin. Update your STARLINK Multimedia Software and Navigation Maps.
16-130-202020-09-04. Service bulletin. This bulletin announces availability of reprogramming files to optimize the Transmission Control Module (TCM) used in the TR580 and TR690 CVT.
11-200-20R2020-06-02. Service bulletin. This bulletin announces the availability of reprogramming files to optimize the Engine Control Module (ECM) for hard starting in sub-freezing temperatures, DTC P0400, and surging in high altitudes.
11-191-192019-08-06. Service bulletin. This bulletin announces availability of a new Engine Control Module (ECM) for the models listed above designed to address DTC P2610: “ECM/PCM ENGINE OFF TIMER PERFORMANCE”. Under certain RARE conditions, an electrostatic surge may influence the ECM’s internal timer used after the engine is turned off and store a DTC P2610 in memory. Hardware in the ECM has been changed to eliminate any impact from electrostatic surges.
GEN 3-12019-05-28. Service bulletin. Immediately discontinue the use of latest 2019 MY Gen 3.1 Harman Software update.
15-236-18R2019-05-28. Service bulletin. The following information addresses reprogramming file availability and a software update installation procedure to provide optimization to the new Harman Gen 3.1 Audio and Navigation head units utilized in the models as listed above. The procedure will involve either downloading the software update files from Subarunet (or using those sent directly from Nuspire) and transferring them onto a flash drive for head unit installation. It is VERY IMPORTANT to read and understand this information completely to understand all changes from prior releases before proceeding.
11-184-182019-02-25. Service bulletin. This bulletin announces reprogramming file availability to optimize the ECM. These new files prevent an incorrect diagnosis of DTC P119F: AIR FUEL RATIO IMBALANCE FOR DIRECT INJECTION (BANK 1 FLUCTUATION ENGINE SPEED) and DTC P219A: AIR FUEL RATIO IMBALANCE (BANK 1).