# Service bulletin WVH18R

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: 10131696
- Published by NHTSA: 2018\-04\-02
- Manufacturer's number: WVH18R
- Manufacturer's date: 2017\-02\-17
- NHTSA component: ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING

## NHTSA's summary

PZEV MODELS ONLY. REVISED. This Campaign only applies to vehicles with motor vehicle registration in the States of California, Massachusetts, Maine, New York and Vermont. For affected vehicles registered in any other state, see Service Program WVI\-19. INTRODUCTION Subaru of America, Inc. \(SOA\) has determined that vehicles affected by this Service Program require ECM reprogramming along with catalytic converter efficiency testing and possible replacement. Under certain unique driving patterns, such as repeated acceleration and deceleration and/or continuous uphill driving at higher speeds \(about 75 mph\), the catalytic converters of affected vehicles may develop high internal temperatures that exceed design parameters. If left uncorrected, this condition may eventually degrade the efficiency of the catalytic converters. \(The ?CHECK ENGINE? light will illuminate to alert the driver if catalytic converter efficiency has degraded beyond an acceptable level and the vehicle may be releasing air pollutants which may exceed California standards.\) To prevent this condition, a modification to the Engine Control Module software logic has been developed that will improve management of temperatures within the catalytic converters. This condition is a software issue and has no impact on vehicle drivability.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2017/MC-10131696-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2017/MC-10131696-0001.pdf)

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

## Components

Electrical system, Engine

## Vehicles listed

- 2005 SUBARU LEGACY
- 2005 SUBARU OUTBACK

## Recalls for the same vehicles and component

- [2019191](/recalls/tc/2019191.md), 2019-04-18: Electrical
- [19V297000](/recalls/nhtsa/19V297000.md), 2019-04-11: ELECTRICAL SYSTEM:IGNITION:SWITCH

## 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.
- [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
- [15\-219\-18R](/bulletins/11030567.md), 2026-04-02, Service bulletin: ELECTRICAL SYSTEM. This bulletin contains information to help when attempting to complete the STARLINK Telematics subscription process, an Error Code 202 and / or 204 may occur preventing the process from completing successfully
- [SubaruNet Announcement \(A](/bulletins/11030561.md), 2026-04-02, Other: ELECTRICAL SYSTEM. This announcement provides information on the use of aftermarket services or tools for programming immobilizer keys/fobs.
- [10\-105\-25R](/bulletins/11030560.md), 2026-04-02, Service bulletin: ELECTRICAL SYSTEM. This bulletin announces the new procedure and Warranty Fail Code for FirstTime air conditioning \(A/C\) performance concerns possibly resulting from an undetected A/C refrigerant leak.

JSON: [/v1/bulletins/10131696](/v1/bulletins/10131696)

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