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Service bulletins for the 2021 Subaru Ascent

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.

384 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

Only bulletins with component: Electrical system are shown. Show all

Bulletins, newest first
11-202-21R2021-03-04. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. This bulletin announces availability of reprogramming files for the Engine Control Module (ECM).
11-202-212021-03-04. Service bulletin. ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM. This bulletin announces availability of reprogramming files for the ECM. These new files will address DTC P1160 and customer concerns of extended cranking in cold temperatures.
15-219-18R2021-02-01. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides information related to error code 202 and/or 204 generated during the Gen 2 Telematics subscription process. This bulletin is applicable to all 2019-2021MY vehicles equipped with a Gen. 2 Telematics System.
15-195-16R2021-02-01. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This bulletin provides important information regarding diagnosis and replacement of the STARLINK Telematics Data Communication Module (DCM). This update is applicable to all models equipped with a STARLINK Telematics System.
15-265-20R2021-02-01. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This bulletin provides an overview and basic instructions for use of the “Destination to Vehicle” feature of the Gen 2 Telematics system.
15-266-20R2021-02-01. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides helpful procedures and best practices to utilize when customers present with concerns relating to the operation of their Gen 2 Telematics system equipped Subaru.
15-267-20R2021-02-01. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This bulletin provides information related to the telematics system's Automatic Collision Notification (ACN) and Advanced Automatic Collision Notification (AACN) feature operation, diagnostic tips, and best practices.
15-242-19R2021-02-01. Service bulletin. ELECTRICAL SYSTEM. This bulletin has been developed for use as a quick reference tool to aid in diagnosing operational concerns of the Gen 2 Telematics system's remote access features.
15-236-18R2021-02-01. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. Reprogramming File Availability for Optimization of Harman Gen 3.1 and Gen 3.1α Audio and Navigation Head Units.
01-168-09R2021-02-01. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. The purpose of this bulletin is to provide replacement key and immobilizer information.
15-236-18R2021-01-05. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING 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.
15-219-18R2021-01-05. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This bulletin provides information related to error code(s) 202 and/or 204 generated during the Gen 2 telematics subscription process.
07-183-202020-11-05. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This Service Information Bulletin provides corrected and updated procedures to follow when replacing the combination meter assembly.
15-272-20R2020-11-05. Service bulletin. EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM); EQUIPMENT; ELECTRICAL SYSTEM. This bulletin contains illustrations of exchange components and their manufacturer as well as a description of the proper exchange procedure.
05-78-202020-11-05. Service bulletin. ELECTRICAL SYSTEM; TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS. This Service Information Bulletin announces additional diagnostic procedures for TPMS related DTC C2921 on the applicable models listed.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.