2021 GMC Acadia transmission problems

Filed May 12, 2026 · Electrical, Transmission · MD

This is a very known issue that has been reoccurring with GMC Acadia. The torque converter slipping. That cost alone is over $7.000 for the transmission. I am still making monthly payments for my 2021 Acadia. With rising cost above the board GMC could have resolved this issue before releasing this vehicle to the public for purchase. Only had this vehicle for 2 years and already a new transmission is needed. Other individuals i personally know have the same issue. From my research GMC is aware and fails to do a recall on this issue.

Filed Feb 10, 2026 · Transmission · GA

Had vehicles looked at twice and serviced once for the transmission slipping. No issues were found when looked at and light was deleted. Took to another mechanic who drained and refilled transmission. Transmission still slips after service. This happens at acceleration and continues til 3rd gears where it jerks in between gears. Stops while driving continuously, the starts up again if stopped for any reason.

Filed Jan 8, 2026 · Driver assistance, Transmission · FL

Cars is not keeping track of temperature showing engine is cold after 30 minutes of driving, fan runs for extended periods of time after shutting off, check engine light comes on, steering assist alert comes in screen. All of this happens in a cycle. To stop it the battery has to be unplugged and reconnected resetting the car and everything goes back to being fine for a short period of time.

Filed Nov 23, 2025 · Engine, Steering · TX

The thermostat failed which cause the steering system to fail and car to not read temperature

Filed Nov 6, 2025 · Transmission · TX

Transmission feels like it’s slipping, almost like a jerky shift from any stop, seems like a common issue and should be recalled!

Filed Oct 22, 2025 · Electrical, Steering · MT

While driving, error popped up stating steering assist is reduced; drive with caution. Heat was no longer working. Engine temp was reading cold even though vehicle had been running for half hour and temp outside was 65 F. After vehicle was stopped, engine fan ran very loudly for at least 15 minutes. Took vehicle in to have diagnostics ran, and received error P0128 pointing to faulty engine coolant thermostat and sensor. Also received U0401 indicating insufficient data coming from ECM/PCM. I was told that together with U0401 and P0128 together indicate a communication problem between control modules. Check engine light was never on.

Filed Oct 8, 2025 · Transmission · TX

*Transmission or torque converter. *Vehicle shuddering or shaking at low speeds or when shifting. *Studders while trying to drive fromstop. Can casue accident. *No check engine lights or any warnings prior to failure. *Did not accuse anything when checked by diagnostice tool. *Issue started in Sept but is ongoing

Filed Sep 22, 2025 · Transmission · TX

Received message "Steering assist is reduced. Drive with care". This is related to a faulty thermostat and temperature sensor.

Filed Jul 5, 2025 · Transmission · MI

Driving out of state. My 2021 Acadia with 41,172 miles. When pushing the gas to go there is slippage when trying to accelerate. MY car went automatically into neutral saying transmission and then not start. After a rest period it would start then repeat the same issue. In bumper to bumper traffic on I75. The most Terrifying & UNSAFE place to be at 75 to 80 mph. We happened to be driving up on construction and slow down traffic. When the car stalled. Towed it to a transmission place because of code. They replaced the DTR1 PCM.

Filed Mar 27, 2025 · Driver assistance, Electrical · VA

Vehicle gives, “Driver assist reduced Drive with care” warning randomly. Lane change will no longer work and engine light will come on. Problem is sporadic and does not stay active. Engine light will shut off after a day. Once vehicle is shut off cooling fan runs extremely loud and for a long period of time draining battery.