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Complaint 2205223

2020 GMC ACADIA • ENGINE • incident May 15, 2025

Crash
No
Fire
No
Injuries
0
Deaths
0
Complaint ID
2205223
Make
GMC
Model
ACADIA
Model Year
2020
Component
ENGINE
Incident Date
May 15, 2025
Date Received
May 10, 2026
Data As Of
Sep 1, 2026

Complaint Summary

ENGINE

Owner Narrative

A common issue in GMC vehicles (particularly 2017–2020 Acadias) is a "Steering Assist Reduced" warning message triggered by a failed engine coolant thermostat that gets stuck open. This causes the engine to run too cold (P0128 code), causing the computer to reduce steering assist (which is dangerous) and run fans on high, also the air conditioner fails. I have seen many complaints about this and it seems to be a manufacturers problem. GMC put out a repair bulletin for the 2021 models with this issue. It's time to address these other years.

Owner-submitted narrative on file with NHTSA. Complaint narratives are self-reported and have not been verified.

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