FORD issued a recall on the F350, F550, and F450 models

Certain ambulance or fire package vehicles with 6.7L diesel engines may experience a "stop safety now" warning message and 5 audible chimes if an Exhaust Gas Temperature (EGT) sensor fault is detected. Engine torque would be gradually reduced by 70 percent over a period of 45 seconds to a power-reduced level that is maintained. During this time, there would be no effect on steering, braking, lighting, electrical, or restraint systems, allowing the operator to maneuver the vehicle to a safe location. Such an occurrence could also result in an engine shut down and subsequent inability to quickly restart the vehicle. If this condition were to occur when an ambulance or fire engine vehicle was transporting a patient or providing medical assistance, it could delay medical treatment and increase the risk of injury to the patient. Correction: Dealers will reprogram the Powertrain Control Module with updated software.