One problem related to engine knocking noise has been reported for the 2012 Ford F-550. The most recently reported issues are listed below.
The contact owns a 2012 Ford F-550 sd. The contact stated that while driving approximately 20 mph, a loud banging sounded was heard inside the cabin and the engine power reduced substantially. The engine was turned off and restarted, but the failure persisted. An independent mechanic diagnosed the vehicle and detected that the turbo became stuck and the turbo hose disconnected. The hose was reconnected; however, the failure continued. The vehicle was not repaired a second time. The manufacturer was not notified of the failure. The approximate failure mileage was 45,000. The VIN was unavailable.