Cadillac XT6 check engine light comes on

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 Oct 13, 2026 · Engine, Steering · MI

DTC P0128 engine coolant thermostat to open at a lower temperature than intended. The Check Engine Light appeared, a Steering warning appeared on my information screen, and the engine cooling fan continued to run excessively after turning off. I understand there is a Special Coverage N252508350 for this exact issue, however, GM is refusing to cover the cost of repairs.

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. 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.

Filed Jul 18, 2024 · Electrical · 2,000 miles · IL

The contact owns a 2024 Cadillac XT6. The contact received notification of the federal safety agency Campaign Number: 24V459000 (Electrical System) however, the part to do the recall repair was not yet available. The contact stated that the steering wheel had seized, and the instrument panel failed to function as needed. In addition, the contact had received a service alert via the Cadillac App that the ABS had failed. The check engine warning light was illuminated. The vehicle was taken to a local dealer where a system update was performed. The vehicle was repaired temporarily, and the check engine warning light illuminated again. The vehicle was taken to another local dealer where a system update was performed at Cadillac of Naperville (1507 W Ogden Ave, Naperville, IL 60540). The contact stated that the parts to complete the recall associated with the vehicle were not available. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 2,000. Parts distribution disconnect.

Filed Dec 16, 2023 · Fuel system · FL

P2BB3The Engine and Transmission System is not performing as expected. An issue has been detected in the Fuel Management System used to maintain, control and monitor fuel consumption. If the check engine light is flashing, a misfire condition has been detected. A misfire increases vehicle emissions and could damage the emission control system on the vehicle. Please reduce vehicle speed, avoid hard accelerations, avoid steep uphill grades, and reduce any cargo loads such as a trailer.

Filed Dec 13, 2023 · Engine, Fuel system · FL

The vehicle's check engine light came on late afternoon and then started with a delayed turn over, but not actually starting thr following day. The vehicle had to be towed to the dealership. The technician and service advisor commented immediately that it is likely the fuel pump control module. With the commentary about the likely cause was that this is a widespread issue among GM vehicles. Thankfully, the vehicle was at home when it stopped starting but the transition from check engine to stopping operation was almost immediate.

Filed Jul 7, 2023 · Fuel system · FL

The problem is the fuel pump control module is faulty and broke twice now. The car was purchased in 2021, new. Within months the fuel pump control module failed while I was driving in traffic, in an elementary school zone with children all around. I tried to drive through an intersection when without warning the car abruptly stopped causing the cars behind me to swerve to avoid a collision. Good samaritans had to push it far out of the way due to the children crossing. I was told by Sawgrass Cadillac that it was the fuel pump control module that has a short starving the car for fuel without warning because it is an electrical issue. It was fixed, until July 4, 2023 when again while in traffic the engine light came on, the car shuddered and then abruptly stopped. Cars around me swerved, nearly colliding into me with my daughter in the car. Sawgrass Cadillac again said it is the fuel pump control module that they are looking to replace it again. This is a design failure, one that is well known and documented all over the internet. This design needs to be recalled before someone is killed because if I had made it to the highway and this happened who knows what could have happened. I will not drive the car, it is a life safety issue that is cannot be repaired away, it needs to be completely redesigned. The dealer is aware, but you can contact them for further information. The dealer is Sawgrass Cadillac in Sunrise Florida, Ed Morse.