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Service bulletins for the 2020 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.

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

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Only bulletins with component: Engine are shown. Show all

Bulletins, newest first
WUU-06R2020-01-07. Service bulletin. ENGINE; ELECTRICAL SYSTEM. In the interest of customer satisfaction, Subaru of America, Inc. (Subaru) is initiating a Service Program to reprogram the Engine Control Module (ECM) on certain 2019-2020MY Ascent and 2020MY Legacy & Outback vehicles. In some vehicles, the current software may cause the sub learning value control to operate improperly during the wake-up mode of the ECM. This could cause repeated erroneous learning of the accelerator position which can result in the disabling of the VDC function. When the VDC function is disabled, EyeSight, Reverse Automatic Braking (RAB), and Electronic Parking Brake (EPB) auto release functions are disabled by the VDC fail signal causing the VDC, EyeSight, RAB and EPB warning lamps to illuminate. This program affects approximately 115,729 vehicles.
Subarunet Announ2020-01-07. Service bulletin. ENGINE AND ENGINE COOLING. WUU-06 ECM Reprogramming for DTC C1424 Customer Satisfaction Service Program.
02-184-192020-01-07. Service bulletin. ENGINE AND ENGINE COOLING. This Service Information Bulletin provides the proper tightening / torque sequence to follow when installing Intake Duct #3 onto the intercooler assembly. Following the sequence below will insure the bolts remain fully tightened.
11-192-192019-11-01. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. This bulletin announces availability of reprogramming files to optimize the Engine Control Module (ECM). The new files will address isolated concerns of an extended cranking (hard starting) condition. They will also address a DTC P1604 which may be stored in the ECM memory without illuminating the Check Engine light.

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