NHTSA Complaint #11466090 — 2017 CADILLAC XT5

The vehicle's park brake system failed to actuate resulting in unsafe parking of vehicle on hills/slopes. The service park brake light activated on the dash. Vehicle was taken to dealership to investigate. They confirmed park brake system was not working. This vehicle has electronic actuators for the park brake function on each rear wheel. The dealership did not find any defective components but determined the vehicle software was the root cause. The software was reset and the system now performs as intended. I am very concerned that a software failure associated with a key parking brake safety system can occur with no known cause.