P0818 Buick Driveline Disconnect Switch Input Circuit

P0819 Buick Up And Down Shift Switch To Transmission Range Correlation

Possible causes
– Faulty Up And Down Shift Switch
– Up And Down Shift Switch harness is open or shorted
– Up And Down Shift Switch circuit poor electrical connection
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
Buick Vehicle:Buick Regal – ?Buick Riviera – ?Buick LaCrosse – ?David Dunbar Buick – Buick Century – Buick LaCrosse – Buick LeSabre – Buick Lucerne – Buick Park Avenue – Buick Regal – Buick Verano – Buick Enclave – Buick Encore – Buick Rainier – Buick Rendezvous – Buick Terraza – Buick Riviera