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What 144 owners told NHTSA about the 2021 GMC Acadia

These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.

All (144)Crash / fire / injury (7)Electrical system (37)Engine (29)Fuel system (26)Brakes (17)Transmission & drivetrain (17)Steering (15)Airbags (8)Backup camera & sensors (7)Speed control (7)Driver assistance (6)

26 of 144 complaints match · Fuel system · clear filters · page 2 of 2

Feb 2, 2022Speed controlFuel system

Brand new vehicle purchased from dealer, at 8900 miles transmission slipped. Dealer has for 2 hours and couldn’t find problem, but replaced transmission fluid it was dark. At 9000 it happened again, they have vehicle and said the new transmission fluid is dark and muddy. Only 100 miles, so they determined they need to take apart transmission and see what happened. It’s a 52k car, it should not be repairs, it should be replaced under warranty. Video of 8900 from dealership https://video.37483.net/timeline/2CJTHEW6

NHTSA ODI 11450038

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Working with the data? Download all 144 complaints as CSV · fetched from NHTSA July 10, 2026

How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your pre-purchase inspection list. Back to the full 2021 GMC Acadia verdict →