Introduction

Subaru of America, Inc. has identified a need to reprogram the Engine Control Module (ECM) for specific 2015 Subaru WRX and 2014-2015 Subaru Forester 2.0L DIT models. This service program addresses potential issues related to engine idle roughness, engine noise, and spark knock (pre-ignition) under certain high engine load conditions. The ECM reprogramming optimizes key engine parameters to enhance performance and prevent potential long-term damage.

Affected Vehicles

This program applies to certain 2015 model year WRX 2.0L DIT vehicles and certain 2014-2015 model year Forester 2.0L DIT vehicles. Owners are advised to contact their Subaru retailer for confirmation of coverage and to schedule the necessary service.

Service Procedure Overview

The service procedure involves checking the vehicle's current ECM calibration, diagnosing any stored Diagnostic Trouble Codes (DTCs), and performing a spark plug inspection and cylinder leak-down test. Based on the test results, the ECM will be reprogrammed, or in cases of significant damage, an engine assembly replacement may be required. Detailed steps and claim reimbursement procedures are provided for service technicians.

Owner Information

Owners of affected vehicles will receive a notification letter from Subaru of America, Inc. The repair is performed at no cost to the owner. For California registered owners, completion of this program is necessary for vehicle registration renewal and passing emission tests. Contacting a Subaru retailer for an appointment is recommended.

Additional Resources

For more information or to locate a retailer, please visit www.subaru.com or the dedicated campaign website at www.wqw58.service-campaign.com.