2021 Cadillac XT5

Sudden Engine Shutdown and Loss of Steering Assistance in Traffic — 2021 Cadillac XT5 While operating our 2021 Cadillac XT5 in traffic, the vehicle suddenly and unexpectedly stopped running. The engine shut down, the instrument panel went dark except for a warning stating "Low Battery," and steering locked up. The emergency flashers would not work but blue-tooth did. The AC was working fine until shutdown but has not worked since. The car is still in the Cadillac dealership with no reasons given for the shutdown. The vehicle would not restart and was left immobilized in the middle of traffic, creating a serious risk of a collision. The "Low Battery" warning appeared only after the engine had stopped. There was no indication of a low-battery warning before the shutdown. A check of the vehicle's VIN showed no outstanding safety recalls. We are concerned that an electrical, engine-control, or power-distribution malfunction caused the sudden shutdown and loss of steering assistance. The exact cause has not yet been established. We request that NHTSA review this incident as a potential vehicle safety defect because an unexpected shutdown and loss of steering assistance in moving traffic creates a substantial risk to occupants and other motorists.

Parasitic drain on the battery causes unpredicted electrical malfunctions on the car. 4 batteries replaced in two years.

Parasitic drain on the battery creating unpredictable electronic failures.

Took my car to have new brakes. Talked to mechanic about noise from muffler. I was told baffle was broke inside. He told me the airflow could eventually be block which will disable the vehicle. This could happen while driving. My vehicle has 56,000 miles. I see another person stating the same issue. This issue needs to be on recall. I have not repaired yet.

The Side Detection System warning light came on. I found that other vehicles in our blind spots were not be recognized by the system. The warning lights were not being activated on the side mirrors. The system was repaired at the dealership at a cost of $865.43. When speaking withe the service technician he said this is happening quite frequently. They found three wires that were corroded and two more that showed signs future issues.

I took my SUV to Heritage Cadillac in Lombard, IL for a revving sound while accelerating, specifically from 0-35mph and then acceleration on the highway at higher speeds. It sounded like I was revving the engine even when I wasn't accelerating and stay at a constant speed. There were not any service lights or notification of any issues in my vehicle. The car is at 59,000 miles, I paid $230 for a diagnostic run only to be told it was a "Faulty Muffler" and needed replacement for $1479.66 as it was not covered in my extended warranty. When I took it for a competing bid at a national-brand muffler shop, I was told parts were very hard to get for it as the car was "so new" and that he had another customer bring in for the same problem, but he couldn't find the muffler in his national data base. This lead me to research further why this would happen to a car only 5 year in. This led me down a rabbit hole researching this issue on other Cadillac forums. I'm seeing a recurring pattern among 2020-2021 XT5 owners with the 3.6L engine: a whiny noise when accelerating at low speeds, peaking around 3,000 RPM, traced to loose baffles inside the muffler or a restriction in the exhaust system. Several owners report first noticing it as early as 2,000 miles, with it getting louder over time - which lines up closely with what I experienced. More notably, multiple owners with this exact symptom got their full exhaust systems replaced under warranty, including vehicles with comparable or higher mileage than mine. I've also confirmed there are no open NHTSA recalls on my vehicle, so I know this isn't a recall issue. But given how consistently this specific failure shows up across other XT5s of the same model year and engine, it looks less like isolated wear and more like a known defect pattern.

The contact owns a 2021 Cadillac XT5. The contact stated that while an oil change was being completed, an oil leak was discovered. No warning light was illuminated. The dealer diagnosed the vehicle and determined that the head gasket needed to be replaced. The vehicle was repaired; however, the failure recurred. The vehicle was taken back to the dealer, where it was diagnosed and determined that the head gasket needed to be replaced. The vehicle was repaired; however, the failure persisted. The vehicle was taken back to the dealer, where it was diagnosed with an internal leak in the engine. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 30,000.

The contact owns a 2021 Cadillac XT5. The contact stated that while driving approximately 50 MPH, the infotainment screen was touched but went black and failed to respond. The vehicle was turned off and restarted at the next traffic light, and the infotainment screen was touched and remained black and failed to respond. The vehicle was taken to an independent mechanic and was diagnosed; however, the diagnostic result was not provided. Due to the failure, the HVAC system, GPS, Bluetooth, Back Over Prevention, and Lane Keep Assist features became inoperable. The manufacturer was notified of the failure. The failure mileage was approximately 113,240.

When braking — both at low speeds and when slowing from highway speeds (40+ mph) — vehicle feels like engine revs and is still pushing against the brakes. Requires very firm pedal pressure to hold car in place; if brake pressure is eased, vehicle surges forward until it finally settles after several seconds. Concern is intermittent but repeatable. I had a near collision on 10/3/2025 due to this issue. I have been in constant contact with the dealership on this, including the service manager, as well as Cadillac Care. The dealership has test driven the vehicle several times and has been unable to replicate the problem. However, I do have an audio recording of the engine’s idle speed at various points during one incident.

Car exhaust was making vibration sound brought into dealership and the muffler is broke on the inside. Cadillac repair said it’s not a common occurrence and was not covered under any warranty. Stated it could have broke on the inside due to vibrations. The muffler shouldn’t have just broke inside due to vibrations if the integrity of it has to of been compromised especially if the car isn’t that old and there’s no damage.

Driving down the highway yesterday, I believe that the sunroof on my Cadillac XT4 exploded. It was a hot day and I heard a loud bang. My sunroof shattered and no rocks or other external debris to be found.

The contact owns a 2021 Cadillac XT4. The contact stated while driving 40-45 MPH, the vehicle suddenly stopped, and was shifted into park but failed to restart. There were no warning lights illuminated. The vehicle was towed to the local dealer where it was diagnosed and determined that the fuel pump control module and battery needed to be replaced. The vehicle was not repaired. The manufacturer was not contacted. The failure mileage was approximately 34,536.