# 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.

- Type: Service bulletin
- NHTSA id: 10238443
- Published by NHTSA: 2023\-07\-03
- Manufacturer's number: 15\-236\-18R
- Manufacturer's date: 2023\-06\-06
- NHTSA component: EQUIPMENT: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

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10238443-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10238443-9999.pdf)

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

## Components

Electrical system, Equipment and accessories, Software

## Vehicles listed

- 2019 to 2022 SUBARU ASCENT
- 2019 to 2021 SUBARU BRZ
- 2019 to 2023 SUBARU CROSSTREK
- 2019 to 2023 SUBARU FORESTER
- 2019 to 2023 SUBARU IMPREZA
- 2019 SUBARU LEGACY
- 2019 SUBARU OUTBACK
- 2019 to 2021 SUBARU WRX
- 2019 to 2021 SUBARU WRX STI

## Recalls for the same vehicles and component

- [21V264000](/recalls/nhtsa/21V264000.md), 2021-04-15: 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
- [19V743000](/recalls/nhtsa/19V743000.md), 2019-10-18: ELECTRICAL SYSTEM:SOFTWARE; ELECTRICAL SYSTEM:IGNITION

## Other bulletins for the same vehicles and component

- [07\-222\-23R](/bulletins/10241798.md), 2023-09-05, Service bulletin: ELECTRICAL SYSTEM; ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT. 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\-22](/bulletins/10216977.md), 2022-08-02, Service bulletin: EQUIPMENT; POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE. 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\-19R](/bulletins/10207171.md), 2022-02-04, Service bulletin: EQUIPMENT; ELECTRICAL SYSTEM:SOFTWARE. This bulletin outlines a new required procedure to follow when performing immobilizer\-related repairs on the 2020\-22 Legacy and Outback.
- [Subaru Starlink](/bulletins/10180739.md), 2020-10-05, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. Update your STARLINK Multimedia Software and Navigation Maps.
- [16\-130\-20](/bulletins/10179380.md), 2020-09-04, Service bulletin: POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE. This bulletin announces availability of reprogramming files to optimize the Transmission Control Module \(TCM\) used in the TR580 and TR690 CVT.
- [11\-200\-20R](/bulletins/10175989.md), 2020-06-02, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL. 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\-19](/bulletins/10163563.md), 2019-08-06, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; ELECTRICAL SYSTEM. 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\-1](/bulletins/10160507.md), 2019-05-28, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. Immediately discontinue the use of latest 2019 MY Gen 3.1 Harman Software update.
- [15\-236\-18R](/bulletins/10160501.md), 2019-05-28, Service bulletin: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ELECTRICAL SYSTEM:SOFTWARE. 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\-18](/bulletins/10153613.md), 2019-02-25, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; FUEL SYSTEM, GASOLINE. 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 \(BANK 1\).

JSON: [/v1/bulletins/10238443](/v1/bulletins/10238443)

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