2021 Cadillac Xt5

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.

Fuel pump module failed twice. There was no warning lamps, messages or other symptoms prior to the failure. The first time I was driving the second time the car was parked and did not start. See below for details. Safety: Thankfully i was not driving 70+MPH down a busy highway when the car shut down. Given the past recall, the number of Cadillac owners experiencing the problem and that it's happened to me TWICE within three years, it's only a matter of time before serious injury or death occurs. First time: [XXX], Milage: 15,063 i was driving down a small-town highway doing 55 when the car stopped working. All power went off, no acceleration, difficulty steering. I was able to safely get to a side road. Had it towed to local Chevy dealer for repair. They diagnosed the issue: Bad fuel pump driver control module. Second time: [XXX], Milage: 34, 6112 The car was parked at my house and failed to start. Had it towed to local Cadillac dealership for repair. They diagnosed the issue: Bad fuel pump driver control module. Additional information I've found a previous recall on the fuel pump module from 2021 on Cadillac SUVs [XXX] I've found many forum posts of Cadillac users experiencing the same problem. This is just one link for XT4 and the last post from a user with the exact same problem was March 6, 2025, and another on Feb 4, 2025. [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

The contact owns a 2021 Cadillac XT4. The contact stated that while stopped at a traffic signal, the signal turned green; however, when the accelerator pedal was depressed, the vehicle hesitated before responding as needed. The contact stated that the vehicle lunged into motion. The contact stated that the failure was intermittent at first but became a recurring failure. The contact stated there was no warning light illuminated. The contact had taken the vehicle to a local dealer, where it was diagnosed and determined that the cam shaft and transmission needed to be rebuilt. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 45,000.

The contact owns a 2021 Cadillac XT4. The contact stated that while his wife was reversing and exiting the residential driveway, the back over prevention sensor activated. The contact stated the back over prevention warning light illuminated. The contact stated that there were no obstacles behind the vehicle. The vehicle was taken to the dealer, but the failure could not be duplicated. The contact stated that the vehicle was retrieved and shortly after exiting the dealer's lot, the failure reoccurred. The vehicle was taken to another local dealer where the failure was unable to be duplicated. The contact also stated that the vehicle was taken to Auto Zone and the failure was unable to be duplicated. The vehicle was then taken back to the original dealer. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 32,000.

When I turn on the vehicle, it will have no sound - audio, turn signal, and most importantly and concerning, seatbelt warning chime. the electrical issues also extend to the hvac sustain have been trying to get this resolved with two dealerships and Cadillac directly for 1.5 almost 2 years. The issues began about three weeks after my lease began. Cadillac directly and the dealerships have done nothing to resolve this and have continuously kicked it down the road with no resolution. I am not comfortable driving a vehicle in which seatbelt deatures are compromised.

Safety restraint warning light came on. Took to dealership. They had for 3 days claimed it was repaired. Light came back on 2 days later. Dealership has now had my vehicle 10 days, stating I need a new side drivers airbag. They do not know when it will arrive. I have seen other complaints in this model for faulty airbag sensors/units.

The contact owns a 2021 Cadillac XT4. The contact stated that while driving in stop-and-go traffic, the contact rear-ended a vehicle in front. The contact crashed the vehicle at approximately 5 mph; however, the collision caused severe front end damage to the vehicle. The air bag did not deploy and all electrical safety features failed to operate after the collision. There were no injuries reported and a police report was filed. The radiator began to leak as a result of the accident, therefore, the vehicle was towed to an independent body shop. The manufacturer was notified of the failure and offered no assistance. The vehicle had been repaired. The failure mileage was approximately 1,800.