Vehicle Safety Complaint I am submitting this complaint regarding my 2025 Cadillac XT4 because of a serious transmission failure that created a significant safety hazard. While driving on the interstate at approximately 60 mph, the transmission suddenly malfunctioned and the vehicle lost its ability to operate normally. The transmission appeared to disengage unexpectedly, causing a sudden loss of power and creating a dangerous situation in fast-moving traffic. I was concerned that my vehicle could have been struck by other vehicles because it was no longer responding as expected. The vehicle had to be towed to an authorized Cadillac dealership for inspection and repair. After diagnosing the problem, the dealership informed me that the entire transmission required replacement. This is a major component failure on a nearly new vehicle with relatively low mileage. A complete transmission replacement on a new vehicle, combined with a sudden failure at highway speed, raises serious concerns about the safety and reliability of this model. A transmission should not fail unexpectedly under normal driving conditions, especially in a new vehicle. (They changed gearbox in 14 days) I am reporting this incident because I believe it represents a potential safety defect that could place other drivers and passengers at risk. I respectfully request that NHTSA investigate whether similar transmission failures have been reported in the 2025 Cadillac XT4 and determine whether this issue warrants further investigation or a safety recall. In addition to the highway transmission failure, I have experienced another serious safety concern. When shifting the vehicle from Park into Drive or Reverse, the transmission sometimes does not engage immediately. Instead, there is a delay of several seconds, followed by a sudden and unexpected engagement that causes the vehicle to lunge forward or backward. This sudden movement is completely outside of my control and creates a significant safety risk.

Source: NHTSA complaint ODI #11752434 · view all complaints for this vehicle at nhtsa.gov

The Onstar service will not operate. The Onstar system drains the batter so the car will not start. Cadillac cant get the operative part for the Onstar, the telematic module. So the car is sitting at the Cadillac dealer and cant be repaired..

Source: NHTSA complaint ODI #11737617 · view all complaints for this vehicle at nhtsa.gov

On July 28, 2025, while driving the vehicle on public street, a warning flashed that the brakes have failed. In fact the brakes were totally inoperative. Driver was able to clear traffic and exit the roadway without incident. The Cadillac dealership found no issue with the brakes, but did "update the brake control module." In March, 2026 a crack in the windshield appeared. Safelite Company was unable to replace the windshield, as their computer showed several modular errors, preventing them from recalibrating a new windshield. The car was taken to the local Cadillac Dealer, who was presented with a printout showing the following: Code U1961-92, "fail since clear. Code U164E-00, "fail since clear. Code U1605-00, "fail since clear", Code U1974-00, "fail since clear", U197A-00, "fail since clear", Code U1961-92 "fail since clear". The dealer reported that these error codes are no problem, and declined to take any action. They further advised that if a warning of any issue appears to bring the car in.

Source: NHTSA complaint ODI #11729189 · view all complaints for this vehicle at nhtsa.gov

The contact owns a 2025 Cadillac XT4 equipped with Continental Tires, Tire Line: Pro Contact TX, Tire Size: 235/60/R18, DOT Number: (N/A). The contact stated that while driving at an undisclosed speed, the passenger’s side rear tires experienced a blowout. The vehicle was taken to the local dealer, where the tire was replaced, but six months later the driver’s side tire experienced a blowout, which caused significant damages to the driver’s side fender wheel well. The manufacturer was contacted but denied any financial assistance due to the purchase of the aftermarket tires. The contact replaced all four tires due to the concerns of another blowout. The approximate failure mileage was 9,114.

Source: NHTSA complaint ODI #11757623 · view all complaints for this vehicle at nhtsa.gov