P1511 Buick Idle air control solenoid valve signal 1 circuit high input

P1512 Buick Idle Air Control Solenoid Signal 2 Circuit Low Input

Possible causes
– Faulty ISC Solenoid
– ISC Solenoid harness is open or shorted
– ISC Solenoid circuit poor electrical connection
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1512 Buick Description

Idle Speed Control (ISC) Solenoid

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