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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: Transmission and driveline are shown. Show all

Bulletins, newest first
SubaruNet Announcement (T2026-10-05. Other. POWER TRAIN; ELECTRICAL SYSTEM. This announcement provides information on an enhancement of the TechShare CVT diagnostic assitance application.
16-154-25R2026-09-03. Service bulletin. POWER TRAIN. This Service Information Bulletin announces the release of a new diagnostic assistance application for TR690 and TR580 CVT-equipped vehicles. This is an revised version of the original bulletin.
16-150-24R2026-09-03. Service bulletin. POWER TRAIN. This bulletin announces availability of new reprogramming files developed to address SYMPTOM 1: A jerk or judder sensation felt from the powertrain during braking with the air conditioning on. SYPMTOM 2: A shudder is felt from the powertrain along with a screeching type of sound. This is an revised version of the original bulletin.
16-132-20R2026-09-03. Service bulletin. POWER TRAIN. This Bulletin provides updated diagnostic procedures to follow and a brief questionnaire to complete when diagnosing an alleged Chain Slip condition on the TR580 and TR690 model CVT transmissions used in the models listed. This is an revised version of the original bulletin.
SubaruNet Announcement (C2026-09-03. Other. ELECTRICAL SYSTEM; POWER TRAIN. This Announcement provides diagnostic assistance for CVT issues.
16-151-24R2026-07-02. Service bulletin. POWER TRAIN. This bulletin provides guidance when diagnosing chain slip, judder, shudder, and hesitation concerns on the TR690 model CVT transmissions used in the models listed. (This is an revised version of the original bulletin.)
18-241-262026-06-01. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN. This Bulletin announces a correction to the diagnostic procedures for certain CVT related DTCs, including P0730, P0746, P0747, P0841, P0846, P0867, P1867, P1894, and P2723.
16-157-262026-06-01. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM. This bulletin announces a design change to the TR690 CVT control valve body which features an enhanced line pressure sensor O-ring, designed to prevent abnormal sensor readings caused by O-ring leakage.
SubaruNet Announcement (R2026-06-01. Other. POWER TRAIN. This announcement provides information on the remanufactured CVT transmission program.
16-151-24R2025-11-04. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM. This bulletin provides guidance when diagnosing chain slip, judder, shudder, and hesitation concerns on the TR690 model CVT transmissions used in the models listed.
16-154-252025-10-02. Service bulletin. POWER TRAIN. This Bulletin announces the release of a new diagnostic assistance application for TR690 CVT-equipped vehicles.
Subaru Service Technical2025-09-02. Other. ENGINE; ELECTRICAL SYSTEM; POWER TRAIN. Subaru Service Technical Support Newsletter special edition.
03-96-252025-05-01. Service bulletin. SUSPENSION; POWER TRAIN. This bulletin announces design changes made to the rear axle hubs. These changes have been implemented to reduce cases water intrusion further leading to harmonic, humming, and grinding type sounds heard from the axle hub while driving.
16-151-24R2025-02-04. Service bulletin. POWER TRAIN. This bulletin provides guidance when diagnosing chain slip, judder, shudder, and hesitation concerns on the TR690 model CVT transmissions used in the models listed.
16-151-24R2025-01-03. Service bulletin. POWER TRAIN. This bulletin provides guidance when diagnosing chain slip, judder, shudder, and hesitation concerns on the TR690 model CVT transmissions used in the models listed.
16-150-24R2024-12-03. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN. "This bulletin announces availability of new reprogramming files developed to address the two symptoms described below: SYMPTOM 1: A jerk or judder sensation felt from the powertrain during braking with the air conditioning on. SYPMTOM 2: A shudder is felt from the powertrain along with a screeching type of sound. NOTE: Both of these symptoms are not related with a fault code."
16-151-24R2024-12-02. Service bulletin. POWER TRAIN. This bulletin provides guidance when diagnosing chain slip, judder, shudder, and hesitation concerns on the TR690 model CVT transmissions used in the models listed.
16-150-24R2024-11-04. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM; ENGINE. This bulletin announces availability of new reprogramming files developed to address symptoms which a jerk or judder sensation can be felt from the powertrain during braking with air conditioning on, or a shudder felt from the powertrain along with a screeching type of sound.
16-151-242024-11-04. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN. This bulletin provides guidance when diagnosing chain slip, judder, shudder, and hesitation concerns on the TR690 model CVT transmissions used in the models listed.
Subarunet Announcement2024-08-05. Other. POWER TRAIN. This annoucement provides parts personnel information about remanufactured transmissions that will no longer be available.
09-117-242024-05-02. 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).
16-144-232023-12-05. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM. This bulletin announces the availability new service procedure developed for the diagnosis of the following DTCs detected by the Transmission Control Module (TCM):
16-140-232023-10-03. Service bulletin. POWER TRAIN; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); ELECTRICAL SYSTEM. This bulletin announces availability of new reprograming files for the Transmission Control Module (TCM) to address judder a sensation possibly accompanied by a vibration-type sound when accelerating from slow speeds.
16-141-23R2023-08-02. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY:THERMAL MANAGEMENT:FLUID/COOLANT; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); ELECTRICAL SYSTEM. This bulletin announces availability of reprogramming files to optimize the Transmission Control Module (TCM). The new files were designed to address cases of DTC P0711 (Transmission Fluid Temperature Sensor “A” Circuit Range/Performance) being detected by the TCM during low ambient temperatures (32° F(0° C)).
16-132-20R2023-07-03. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM. This Service Information Bulletin provides updated diagnostic procedures to follow and a brief questionnaire to complete when diagnosing an alleged Chain Slip condition on the TR580 and TR690 model CVT transmissions used in the models listed.

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