Possible causes – Faulty Exhaust Valve Control Solenoid Bank 1– Exhaust Valve Control Solenoid Circuit Bank 1 harness is open or shorted– Exhaust Valve Control Solenoid Circuit Bank 1 circuit poor electrical connection Symptoms – Engine Light ON (or Service
Possible causes – Faulty Exhaust Valve Timing Control Magnet Retarder– Exhaust Valve Timing Control Magnet Retarder harness is open or shorted– Exhaust Valve Timing Control Magnet Retarder circuit poor electrical circuit connector When is the code detected? An improper voltage
Possible causes – Faulty Exhaust Valve Timing Control Magnet Retarder– Exhaust Valve Timing Control Magnet Retarder harness is open or shorted– Exhaust Valve Timing Control Magnet Retarder circuit poor electrical circuit connector When is the code detected? An improper voltage
Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P0078 Description Exhaust Valve Control Solenoid Circuit Bank 1 is the generic definition for the P0078; however your vehicle’s manufacturer may have a different definition and information for the