2018 GMC Acadia engine problems

Related recalls

No recalls on file.

What owners say

1. Filed Sep 29, 2026PAElectrical SystemEngine

   I get error electric Steering assist reduced or unavailable drive with care at around 84234 miles on my car . Upon looking up problem on Internet it has to do with the Thermostat. I also found where Gm has a bulletin N252508350 which only seems to cover certain vehicles with the same problem. This seems to happen at all different miles driven on vehicles. I don't see how Gm can get away with only fixing certain vehicles with this safety problem when it shuts down the…

   NHTSA complaint #11767917 · source
2. Filed Sep 11, 2026VAEngine

   The car will frequently but not always fail to shut off when the start/stop button is pushed while in Park. The message "shift to park" come up on the display and a yellow light comes on in the button. I have to restart the engine and it often takes as many as 10 attempts to finally shut off the engine. Between each attempt I have to shift the transmission out of park and back into park. This has been happening for more than a month.

   NHTSA complaint #11763610 · source
3. Filed May 20, 2026TXEngineSteering

   I am getting the known P0128 code. My engine says it's cold when it's not, my AC isn't working, and I am getting a message that says "Steer assist reduced. Drive with care". This is a known problem and complaint of the GMC Acadia.

   NHTSA complaint #11738997 · source
4. Filed Feb 7, 2026TXCrashBrakesElectrical SystemEngine

   The vehicle has experienced repeated electrical and engine-related malfunctions, including random engine shutdowns while driving and random no-start conditions. The thermostat and cooling system failed and were replaced in 2024. Multiple sensors have failed. The braking system remains noisy even after brake replacement. The lane detection safety system does not provide audible alerts. The vehicle is currently operational and available for inspection upon request. How was…

   NHTSA complaint #11716369 · source
5. Filed Dec 20, 2025MNEngineSteering

   The warning light for a steering assist needs service came on the dash. The dealer had a code (po128) that pertained to a bad thermostat and coolant temp. sensor. The steering assist could have failed, along with possible engine damage. The dealer replaced the thermostat and the coolant temp sensor. Their were no police or insurance reports needed.

   NHTSA complaint #11706286 · source
6. Filed Oct 23, 2025126,000 miMIEngineFuel, Hybrid & EV PropulsionTransmission & Drivetrain

   The contact owns a 2018 GMC Acadia. The contact stated that while driving at an undisclosed speed, the vehicle failed to accelerate while attempting to shift gears. The contact stated that the vehicle jerked and made an abnormal sound, with the check engine warning light illuminated. Additionally, the contact stated there was black and white smoke coming from the rear of the vehicle. The vehicle was taken to the dealer, where it was diagnosed with transmission, cooling…

   NHTSA complaint #11695258 · source
7. Filed May 5, 2025PABrakesEngine

   I have a 2018 GMC Acadia that is now displaying " shift to park " while the vehicle is in park. Upon extensive research I see GMC did issue a recall however, my particular VIN was not included. Its NOW displaying the error message which would lead me to believe it IS part of the recall. I called my local GMC dealership (Langhorne, PA.) and they said this was not covered since my VIN was not issues a recall.

   NHTSA complaint #11658958 · source
8. Filed Apr 3, 2025ILEngine

   A warning popped up on my dashboard stating "Power steering reduced. Drive with care." multiple times. Whenever the warning popped up, my air conditioning would stop working and my engine fan would run very loud. The warning would go off and back on over the course of a year. This started in the beginning of summer, 2024. On 4/3/25 I took it into an auto mechanic shop and after they looked at this warning, they confirmed that the thermostat has an issue where it gets stuck…

   NHTSA complaint #11652547 · source
9. Filed Mar 19, 202598,000 miMDEngineFuel, Hybrid & EV PropulsionAcceleration & Cruise Control

   The contact owns a 2018 GMC Acadia. The contact stated that while driving at 60 MPH, the reduced engine power message was displayed. The RPM increased to high, and the engine revved. The accelerator pedal was depressed, but the vehicle failed to respond as needed. The contact stated that the failure was related to NHTSA Campaign Number: 18V358000 (Fuel System, Gasoline). The vehicle was taken to the local dealer, where it was determined that the high-pressure fuel pump…

   NHTSA complaint #11649181 · source
10. Filed Mar 11, 2025MECrashElectrical SystemEngineTransmission & Drivetrain

    Sold 2018 GMC Acadia by LEE GMC in auburn. Acadias shift to park was defective, dealership replaced before sale did not disclose, shift to park and transmission malfunctions occurred. I returned Acadia to the dealership several times and they would never properly fix or address my concerns now my vehicle is unsafe to drive. I have documentation to support the claims in my letter, I can send as well if you’d like. Thank you Will send attachment

    NHTSA complaint #11647553 · source
11. Filed Mar 2, 2025CAElectrical SystemEngineFuel, Hybrid & EV Propulsion

    Truck lost power randomly while driving on freeway spend so much money on fixing it this has to do something with the way the built it

    NHTSA complaint #11645879 · source
12. Filed Jan 10, 2025TXEngine

    A thermostat failure displays a "steering assist" warning while driving. The thermostat housing has been replaced twice in 3 years after this warning.

    NHTSA complaint #11635194 · source

Source: U.S. National Highway Traffic Safety Administration (NHTSA) Office of Defects Investigation public data. Complaints are submitted by owners and are not verified by NHTSA or by us; a complaint does not prove a defect exists. View this vehicle on NHTSA.gov Methodology