# Service bulletin WTT\-79

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: 10145080
- Published by NHTSA: 2018\-10\-01
- Manufacturer's number: WTT\-79
- Manufacturer's date: 2018\-08\-21
- NHTSA component: ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\)

## NHTSA's summary

Subaru of America, Inc. has initiated a service program for certain 2017?2019 MY Impreza vehicles, and certain 2018?2019 MY Crosstrek vehicles. This service program involves installation of reprogramming files to optimize the ECM.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2018/MC-10145080-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2018/MC-10145080-0001.pdf)

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

## Components

Electrical system, Transmission and driveline, Automatic transmission, Software, Transmission control module

## Vehicles listed

- 2018 to 2019 SUBARU CROSSTREK
- 2017 to 2019 SUBARU IMPREZA

## 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

- [15\-236\-18R](/bulletins/10238443.md), 2023-07-03, Service bulletin: EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM\(GLOBAL POSITIONING SYSTEM\); ELECTRICAL SYSTEM:SOFTWARE; ELECTRICAL SYSTEM. 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.
- [16\-136\-22R](/bulletins/10238440.md), 2023-07-03, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:TORQUE CONVERTER; POWER TRAIN; ENGINE AND ENGINE COOLING; POWER TRAIN:AUTOMATIC TRANSMISSION:INTERNAL:CVT; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). This service bulletin provides a temporary repair procedure to address vibrations and/or judder concerns experienced on turns during acceleration.
- [15\-291\-22](/bulletins/10208659.md), 2022-03-04, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. Going forward when a customer’s vehicle is equipped with a DCM that does not have Software version ID DCM\_06.00.17\_20190816 installed and they wish to subscribe to Starlink Telematics Service, the DCM must be replaced.
- [16\-132\-20R](/bulletins/10207174.md), 2022-02-04, Service bulletin: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; POWER TRAIN:AUTOMATIC TRANSMISSION. This bulletin provides updated diagnostic procedures to follow and a brief questionnaire to complete when diagnosing an alleged Chain Slip condition on the TR580 and TR690 model CVT transmissions.
- [Subaru Starlink](/bulletins/10180739.md), 2020-10-05, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. Update your STARLINK Multimedia Software and Navigation Maps.
- [Subaru Starlink](/bulletins/10180737.md), 2020-10-05, Service bulletin: EQUIPMENT; ELECTRICAL SYSTEM:SOFTWARE. Update for STARLINK Multimedia Software and Navigation Maps.
- [WUA\-86R](/bulletins/10176013.md), 2020-06-02, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE. In the interest of customer satisfation, Subaru of America, Inc. \(Subaru\) is initiating a service program to update the Harman Kardon head unit on certain vehicles with the latest version of software.
- [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.
- [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.

JSON: [/v1/bulletins/10145080](/v1/bulletins/10145080)

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