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.