2020 Cadillac XT6: check engine light

5 of the 40 complaints about the 2020 Cadillac XT6 describe check engine light.

owner complaints: 5
of this car's complaints: 13%
recalls: 0

Is there a fix? 150 service bulletins cover this area of the car. See below

Check engine light by model year

2024
1
2022
1
2021
3
2020
5

What owners say

Filed Nov 6, 2026 · Engine, Fuel system · 88,000 miles · SC

The contact owns a 2020 Cadillac XT6. The contact stated that while idling at a stoplight, the vehicle experienced a loss of motive power. The contact stated that multiple attempts were required to restart the vehicle. During the failure, the transmission failed to shift into neutral, and the check engine warning light illuminated. The contact researched and discovered the federal safety agency Campaign Number: 20V639000 (Fuel System, Gasoline) and associated the failure with the recall. The vehicle was taken to the dealer; however, the dealer could not determine the cause of the failure because the check engine warning light was no longer illuminated. The manufacturer was notified of the failure, and it was confirmed that the VIN was not included in the recall. The failure mileage was approximately 88,000.

Filed Apr 24, 2026 · Transmission · PA

at 60,740 miles, "Steering Assist is Reduced Drive with Care" message appeared. Under warranty, but dealership booked for 2 months. Error went away. After powertrain warranty expires (70,000 miles), message constantly appears, and coolant thermostat display is BLANK. Results in excess fan usage (lowering fuel consumption), reduced steering assist, aggravation, check engine light. This issue has developed while under warranty, for a practically new car. Unacceptable. An extended warranty should be in effect for model 2020 as well.

Filed Dec 10, 2025 · Engine · GA

Vehicle has a known condition with many same year make and model that could cause the engine coolant thermostat to open at a lower temperature than intended. This condition has occurred. As a result the Malfunction Indicator Lamp (Check Engine Light) illuminates and a diagnostic trouble code is set and “steering assistance reduced” appear. The engine cooling fans also run after the engine is switched off. A recent bulletin has been posted to the 2021 Cadillac XT6 but is present in our 2020 as well. Upon calling the dealer our VIN was not on said recall/bulletin.

Filed Jul 22, 2025 · Engine · MI

The Radiator is not functioning, confirmed by a mechanic at a dealership. An engine light did appear to notify me of the problem, however the car has been kept in great condition without accident or cause for the radiator to stop functioning in such a young vehicle.

Filed Dec 23, 2024 · Engine, Transmission · 159,838 miles · OH

The contact owns a 2020 Cadillac XT6. The contact stated while driving at 35 MPH, the vehicle lost power. The vehicle was restarted from the Cadillac App via phone.Â The contact stated that during the second failure " The steering assist is reduced drive with care" warning message and the check engine warning light illuminated. The contact stated she called On-Star where she was informed the tire pressure, the engine, and the transmission needed attention. The vehicle was towed to a dealer by AAA where it was diagnosed the camshaft solenoid was faulty, with a present poil leak, along with codes P0014 and P0017. As a result, the parts of the engine and battery needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure and offered the contact a check to purchase a new vehicle. The approximate failure mileage was 159,838.