2024 GMC Acadia Reliability Report

A sudden "no oil pressure" warning at highway speed, followed by a seized engine, is the dominant pattern. These failures happen early, between roughly 3,076 and 6,400 miles, and strand owners on the shoulder of busy roads. Dealers have called for full engine replacement, and one owner was told no replacement engines were available, with no repair timeline. Repairs and warranty decisions can take weeks. Cracked or leaking radiator hoses that hurt coolant circulation also show up here and raise the risk of engine damage.

Rear tail lamps fail, taking the brake light and turn signal with them. One failure came after only 90 miles, and some owners have replaced the same lamp more than once. The first sign is often a fast-flashing turn signal or a "check tail lamp" message when signaling. Replacement parts are commonly backordered for weeks, so owners drive without a working rear brake light or turn signal while they wait, which raises rear-end collision risk.

Third-row headrests will not fold forward, so the third-row seats cannot be lowered flat and cargo space is lost. A separate complaint describes a front headrest set so far forward that it pushes the driver's head down and makes watching the road uncomfortable. Lowering it out of the way would leave it in an unsafe position in a crash. Owners report that dealers have no alternate parts or fix to offer.

Automatic braking slams on while backing up with nothing behind the car, sometimes several times in one maneuver and starting in the first week of ownership. Owners say dealers acknowledge the problem but have no repair, so some turn the feature off entirely. Super Cruise also brakes suddenly when passing a car in the next lane, which can look like brake-checking and invites a rear-end crash. In other reports, adaptive cruise does not detect the car directly ahead and does not slow down.

The upper radiator hose leaks or fails early, causing coolant loss, low-coolant warnings, and a check engine light. Owners warn that an unexpected breakdown at highway speed or in traffic could follow. Dealerships have confirmed the failed hose and replaced it. Owners report that the part is backordered at several dealers with no arrival date, and at least one owner was told the repair was not covered by warranty.

Adaptive cruise control brakes hard at highway speeds of 55+ mph with no vehicle or obstacle ahead, and this happens repeatedly. Super Cruise disengages without warning, sometimes in the middle of a lane change or while cresting a hill, and in one report the car drifted toward oncoming traffic. Owners describe several dealer visits and long shop stays with no diagnosis. They say GM has told them no fix is available yet.