# Service bulletin WQW\-58R

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: 10120987
- Published by NHTSA: 2017\-10\-27
- Manufacturer's number: WQW\-58R
- Manufacturer's date: 2016\-10\-07
- NHTSA component: EQUIPMENT; ELECTRICAL SYSTEM

## NHTSA's summary

2.0L DIT Models Only. Subaru of America, Inc. has determined that vehicles affected by this Service Program require ECM reprogramming. This bulletin includes the service procedure for diagnosis and repair of customer concerns involving engine idle roughness or, in some cases, engine noise and/or damage resulting from spark knock \(pre\-ignition\). The Engine Control Module logic has also been optimized requiring the ECM reprogramming. The new logic optimizes the ECM for control of the following parameters: ? Change to Fuel Cut control when fuel level is extremely low / near empty ? Change to improve idle smoothness / quality ? Change to boost pressure control under wide\-open throttle \(WOT\) conditions. Under certain high engine load driving conditions, spark knock can occur which results in elevated cylinder temperatures and pressures. Over time, excessive erosion of the spark plugs and possible damage to the pistons can be consequences of continued operation with these conditions present.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2016/MC-10120987-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2016/MC-10120987-0001.pdf)

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

## Components

Electrical system, Equipment and accessories

## Vehicles listed

- 2014 to 2015 SUBARU FORESTER
- 2015 SUBARU WRX

## Recalls for the same vehicles and component

- [17V625000](/recalls/nhtsa/17V625000.md), 2017-10-06: ELECTRICAL SYSTEM:WIRING
- [2015206](/recalls/tc/2015206.md), 2015-05-15: Accessories
- [13V159000](/recalls/nhtsa/13V159000.md), 2013-04-24: EQUIPMENT

## Other bulletins for the same vehicles and component

- [SubaruNet Announcement \(M](/bulletins/11037943.md), 2026-10-05, Other: ELECTRICAL SYSTEM; UNKNOWN OR OTHER. This announcement provides information on a new software update for the Midtronics Dss and DCA machines.
- [18\-244\-26](/bulletins/11037938.md), 2026-10-05, Service bulletin: ELECTRICAL SYSTEM. "This Bulletin announces additional troubleshooting steps for the following DTCs: DTC C1956: RH Actuator Circuit DTC C1957: LH Actuator Circuit"
- [15\-333\-25R](/bulletins/11037929.md), 2026-10-05, Service bulletin: UNKNOWN OR OTHER; ELECTRICAL SYSTEM. This bulletin contains illustrations of exchange components and their manufacturer as well as a description of the proper exchange procedure. This is an revised version of the original bulletin.
- [15\-304\-22R](/bulletins/11037927.md), 2026-10-05, Service bulletin: ELECTRICAL SYSTEM. This bulletin has been developed to outline the steps for gathering basic but essential information during diagnosis of Infotainment concerns. This is an revised version of the original bulletin.
- [15\-308\-23R](/bulletins/11036807.md), 2026-09-03, Service bulletin: ELECTRICAL SYSTEM. This Service Information Bulletin outlines a systematic procedure for diagnosing parasitic draw \(dark/standby current\) in vehicles experiencing battery drain when the ignition is off, leading to no\-start conditions or frequent jump\-starts.This is an revised version of the original bulletin.
- [15\-304\-22R](/bulletins/11036796.md), 2026-09-03, Service bulletin: ELECTRICAL SYSTEM. This Bulletin has been developed to outline the steps for gathering basic but essential information during diagnosis of Infotainment concerns. \(This is an revised version of the original bulletin.\)
- [Article Locator](/bulletins/11036794.md), 2026-09-03, Other: ELECTRICAL SYSTEM. Techtips newsletter locator index.
- [15\-333\-25R](/bulletins/11036789.md), 2026-09-03, Service bulletin: ELECTRICAL SYSTEM. This bulletin contains illustrations of exchange components and their manufacturer as well as a description of the proper exchange procedure. This is an revised version of the original bulletin
- [16\-156\-25R](/bulletins/11034242.md), 2026-07-01, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN. This bulletin announces a design change made to the CVT Control Valve Body which incorporates an enhanced valve sleeve to improve durability. \(This is an revised version of the orignal bulletin.\)
- [16\-156\-25R](/bulletins/11033063.md), 2026-06-01, Service bulletin: POWER TRAIN; ELECTRICAL SYSTEM. This bulletin announces a design change made to the CVT Control Valve Body which incorporates an enhanced valve sleeve to improve durability.

JSON: [/v1/bulletins/10120987](/v1/bulletins/10120987)

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