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
| 06-92-24 | 2024-08-05. Service bulletin. SERVICE BRAKES. This bulletin is in the interest of customer satisfaction, Subaru of America, Inc. (SOA) is extending the New Car Limited Warranty coverage for the front brake on 2019-24 model year Ascent models to 8 years (96 months) or 150,000 miles (whichever comes first). |
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| Subarunet Announcement | 2024-08-05. Other. POWER TRAIN. This annoucement provides parts personnel information about remanufactured transmissions that will no longer be available. |
| 09-74-21R | 2024-08-05. Service bulletin. ENGINE; FUEL/PROPULSION SYSTEM. This bulletin provides updated parts information and a service procedure to follow for removing accumulated carbon deposits from fuel injectors and internal engine components (e.g. intake valves and / or manifold, and combustion chambers). |
| Subarunet Announcement | 2024-08-05. Other. ELECTRICAL SYSTEM. This announcement provides information for retailers to install the latest infotainment system software for Denso CP 1.5. |
| 15-308-23R | 2024-08-05. Service bulletin. ELECTRICAL SYSTEM. This bulletin announces important diagnostic information to utilize when testing the Data Communication Module (DCM) as a dark current/standby current source. All models equipped with Telematics except Solterra. |
| Subarunet Announcement | 2024-08-05. Other. AIR BAGS; ELECTRICAL SYSTEM. This announcement provides information on Takata Recall Escalated Towing Program. |
| Thermo Control Valve Vide | 2024-08-05. Other. ENGINE. This thermo control valve video contains information on the replacement of thermo control valve. |
| 15-236-18R | 2024-08-05. Service bulletin. ELECTRICAL SYSTEM. This bulletin 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. |
| 13-107-24 | 2024-08-05. Service bulletin. UNKNOWN OR OTHER. This Bulletin provides SOA paint codes to help eliminate possible confusion for 2025 MY vehicles. |
| 01-167-08R | 2024-08-05. Service bulletin. UNKNOWN OR OTHER. This bulletin contains additional information for recommended materials listed in the Service Manuals for individual models. |
| 05-91-24 | 2024-08-05. Service bulletin. SUSPENSION. This Bulletin provides guidance for diagnosing a leaking front or rear suspension strut. |
| SubaruNet Announcement | 2024-07-01. Other. ELECTRICAL SYSTEM. This information announces reprograming file availability for Gen 4.5 Denso CP1.5 Audio and Navigation systems. Inprovement for CarPlay concerns with hands-free calls when the receiving party is not able to hear the caller. |
| 06-90-24 | 2024-07-01. Service bulletin. SERVICE BRAKES. This bulletin provides diagnosis and procedure information to be applied when diagnosing potential fluid leaks on front and rear brake calipers. This information has been developed to reduce unnecessary brake caliper replacement. |
| 15-319-24 | 2024-06-04. Service bulletin. ELECTRICAL SYSTEM; ENGINE. This bulletin announces the diagnostic procedures to be followed when encountering cases of the Remote Engine Start (RES) system being the only non-functioning feature with telematics. |
| 09-117-24 | 2024-05-02. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING; POWER TRAIN. This bulletin announces the availability of new reprogramming files developed to address cases of DTC P0890 (TCM Power Relay Sense Circuit Low) detected by the Engine Control Module (ECM). |
| 15-256-19R | 2024-04-03. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This bulletin provides information on a new reprogramming procedure (FOTA) to optimize the Harman Gen 3.1 Audio and Navigation head units (H/U) utilized in the models as listed. |
| 15-236-18R | 2024-04-03. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This bulletin addresses the 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. |
| 7-219-23R | 2024-04-03. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; EQUIPMENT; ELECTRICAL SYSTEM. To satisfy current supply demands, a new Subaru alternative replacement battery is now available. |
| 15-242-19R | 2024-04-03. Service bulletin. EQUIPMENT. 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. |
| 15-219-18R | 2024-04-03. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This bulletin addresses an error code 202 and or 204 when attempting to complete the STARLINK telematics subsription process. |
| 18-225-22R | 2024-04-02. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT; EQUIPMENT:ELECTRICAL:INFOTAINMENT. This bulletin provides the diagnostic procedure for Harman Infotainment Systems when DTC B2255 is detected. This update should prevent unnecessary replacement of the head unit or USB cable. |
| 05-90-24R | 2024-04-02. Service bulletin. SUSPENSION. This bulletin announces changes in design to the front strut assemblies which will address cases of rumbling and/or rattling coming from the undercarriage while going over bumps. |
| 05-90-24 | 2024-03-04. Service bulletin. SUSPENSION. This bulletin addresses rumbling and or rattling coming from the undercarriage while traveling over bumps. Subaru has made a design change to the front strut assemblies to address this issue. |
| 15-251-19R | 2024-02-02. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This Service Bulletin provides additional diagnostics to follow when addressing a Telematics-related DTC B2A16. |
| 15-256-19R | 2024-02-02. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT; EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM); EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. This bulletin provides information on a new reprogramming procedure (FOTA) to optimize the Harman Gen 3.1 Audio and Navigation head units (H/U) utilized in the models as listed. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.