Code P0078 Possible Causes
Exhaust Valve Timing Control Magnet Retarder circuit poor electrical circuit connector
Exhaust Valve Timing Control Magnet Retarder harness is open or shorted
Faulty Exhaust Valve Timing Control Magnet Retarder

Need help with this code? Our mechanics are available within west Michigan to help. Outside of our service area? Visit our Car Help Section where you can ask questions and get answers.