While driving vehicle at approximately 50 mph in normal driving conditions, the vehicle’s automatic emergency braking/forward collision system activated an alert when a vehicle ahead of me slowed and turned out of my lane. After the lane was fully clear and there was no obstacle in front of the vehicle, the system aggressively braked and brought the car completely to a stop on the highway. During the event, the vehicle temporarily would not respond to accelerator input even while pressing the gas pedal. This created an extremely dangerous situation and nearly resulted in a high-speed rear-end collision. No crash occurred, but if a larger vehicle such as a semi-truck had been behind me, serious injury or death could have resulted. I am reporting this as a potential false automatic emergency braking / phantom braking event. Vehicle is a rental, history unknown…

Catastrophic engine failure within 700 miles Requires full engine replacement Problems began around 150 miles on odometer Message: Reduced accelerated speed Check engine light Service transmission system Service variable valve timing system

The contact owns a 2026 Cadillac CT5. The contact stated that while driving the vehicle with the Super Cruise feature activated, the message indicated a road construction zone, and the brakes independently activated. The contact stated that there was no road construction nearby. The contact reset the super cruise control feature. The contact stated that while the super cruise control was set at 75 MPH, the vehicle unintendedly accelerated to 100 MPH within seconds. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The dealer was made aware of the failure; however, the contact was awaiting scheduling information. The manufacturer was made aware of the failure, and a case was filed. The contact was advised to cease using the cruise control feature until the vehicle was inspected by the dealer. The failure mileage was approximately 1,200.