The contact owns a 2021 Ford F-350. The contact stated that the back over prevention camera failed to function as intended. In addition, an error message indicated that the camera was unavailable and to contact the dealer. The contact stated that the back over prevention camera screen would display a black screen or a black screen with lines. The vehicle was taken to the dealer where it was diagnosed with a failed wiring harness. The contact was informed that the wiring harness needed to be replaced. The vehicle was repaired; however, the failure reoccurred. The vehicle was taken back to the dealer several times; however, the failure was not duplicated. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. The manufacturer was made aware of the failure but provided no assistance. The contact was advised to contact the NHTSA Hotline to report the failure. The failure mileage was approximately 130,312.