2017 GMC Acadia engine problems

Filed Oct 12, 2026 · Engine · MN

Steering assist warning. Thermostat and temp control sensor changed twice in 2 years.

Filed Jul 20, 2026 · Acceleration, Electrical · MO

My Acadia went into limp Mode displaying low power mode on the screen and wouldn’t start for a couple days after. Lights started illuminating on the dash as abs, traction control, and stanilitrack, then check engine light came on and my gmc app displayed code p2138. I have had since low power and extremely high gas consumption.

Filed May 19, 2026 · Engine · CA

Steering assist is reduced Brake assist reduced Seems to be a defective thermostat and sensor .temp gauge is below Normal operating temperature this needs to be addressed by GM should be a recall as this can be a costly repair.Many reports of same issue

Filed Mar 24, 2026 · Engine · 90,000 miles · CO

The contact owns a 2017 GMC Acadia. The contact stated that while driving at 65 MPH, the check engine warning light illuminated, and the A/C system became inoperable. Additionally, the engine fan activated and remained activated even after the vehicle was turned off. The contact stated that the failure had recurred while driving. The contact related the failure to GM Special Coverage Number: N252508350 (Engine Coolant Thermostat). The vehicle was taken to the dealer, but was not yet diagnosed or repaired. The manufacturer was notified of the failure and referred the contact to the federal safety agency Hotline for assistance. The failure mileage was approximately 90,000.

Filed Feb 21, 2026 · Engine · IN

The engine is spewing oil from the sides of the engine. This is causing overheating and check engine light to come on. Mechanics cannot get an error read on it. There is no oil leak coming from under the engine.

Filed Feb 11, 2026 · Driver assistance, Electrical · MS

Thermostat Issue (Steering Assist is Reduced Drive with Care) have changed this sensor 3 times in the past 3 years, there is no excuse for that. The emergency braking almost cause me and my daughter to be hit by a train when my car emergency braked while going over train tracks. this is unexcusable

Filed Jan 16, 2026 · Electrical, Engine · NJ

The Car has over the last few years not turn off due to shift to park. This is concerning, due to we cannot turn the car off unless we strike the shifter few times assuming this is the remedy. It doesn't look like there is any type of recall but there should be.

Filed Jan 6, 2026 · Engine · IN

My car will not park. I get a shift to park error message. I tried restarting and shutting it off. Didn't work. I ended up putting it in neutral turning on the emergency brake and then shutting the car off. I have had no problems with this car to this point, I am a single car owner and my car must be reliable. I can't spend a half hour trying to get the car to shut off.

Filed Nov 23, 2025 · Engine, Steering · CA

When I’m driving a warning comes on my DIC screen that says “ACTION REQUIRED STEERING ASSIST IS REDUCED DRIVE WITH CARE”. The AC does not work and the temp gauge goes to cold with the radiator fan blowing at full speed. My car has done this since I purchased it used in 2019 and when I call dealer they say there is no recall and $1200-1800 to replace a sensor and thermostate. I have not had the issue fixed yet.

Filed Sep 20, 2025 · Driver assistance, Engine · OH

While driving at highway speeds, a warning appeared on the Driver Information Center (DIC): “Steering Assist is Reduced – Drive with Care.” Simultaneously, the temperature gauge was stuck on “C,” the radiator cooling fan ran at high speed, and the air conditioning stopped blowing cold air. After researching the issue, I discovered that these symptoms are commonly linked to a failing thermostat—a known and widespread problem with GM’s 3.6L LGX engine. Unfortunately, replacing the thermostat on this engine is not a simple repair, often requiring significant labor and cost. The most concerning aspect is the loss of steering assist, which poses a serious safety risk, especially at highway speeds. Given the frequency of this issue across many GM vehicles, it’s clear that this is a defective part and not an isolated incident. GM should take responsibility and cover the cost of repairs for affected vehicles. This is not just a mechanical failure—it’s a safety hazard that deserves immediate attention. I'm attaching a picture of the message as well a paid repair invoice from the work the dealer performed to replace the thermostat on my vehicle.