NHTSA Complaint #11627506 — 2018 BMW X5

The contact owns a 2018 BMW X5. The contact stated that while the vehicle was parked, there was an abnormal sound coming from the engine compartment. The check engine warning light was illuminated. The vehicle was taken to a dealer where it was diagnosed that the thermostat was stuck opened, causing the check engine warning light to illuminate and the transmission oil coolant heat exchanger to be damaged by the thermostat failure. The contact was advised that the thermostat and coolant pump needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 74,000.