P0078 Buick Exhaust Valve Timing Control Magnet Retarder Circuit Bank 1

P0079 Buick Exhaust Valve Control Solenoid Circuit Low Bank 1

Possible causes
– Faulty Exhaust Valve Control Solenoid
– Exhaust Valve Control Solenoid Circuit harness is open or shorted
– Exhaust Valve Control Solenoid Circuit circuit poor electrical circuit connection
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
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