P0084 Buick Exhaust Valve Timing Control Magnet Retarder Circuit Bank 2

P0085 Buick Exhaust Valve Control Solenoid Circuit Low Bank 2

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