One problem related to engine belts and pulleys has been reported for the 2018 Ford Mustang. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2018 Ford Mustang based on all problems reported for the 2018 Mustang.
My check engine light came on while on cruise control on the interstate going 80mph on a 75 and a few seconds after the check engine light came on , the car shut off and locked up and caused me to lose control. Car was taken to a dealership , and the entire bottom end was torn apart and a few engine components were replaced. After receiving the vehicle back from the dealership the vehicle continues to have electrical and engine problems. The car will at random times shut off while driving , main times is the freeway. Second issue is the car has loud knocking to the engine , sounds like a lifted knock , the car was taken to a dealership, and my car was next to a same year Mustang to compare sound and mine was definitely knocking compared to the other Mustang. Third issue is there is a constant squealing sound like a lose belt coming from the back side of the engine (this recently started) and the fourth issue is when I'm coming down to a stop or slowing down even without touching the breaks there is a metal clinging sound that doesn't stop until the car comes to a complete stop. The car only has 17k miles and is never abused , and has always been properly maintained.