The contact owns a 2018 Ford Mustang. The contact stated that while starting the vehicle, the ‘Exhaust Mode Not Available’ message was displayed. Upon inspection, the contact discovered that the active exhaust on the rear passenger side had rubbed against the subframe, causing valve fuse 34 to blow. The contact replaced fuse 34 but was unable to disconnect the active exhaust, and the wiring had detached. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was made aware of the failure, and a case was opened. The failure mileage was approximately 68,000.