P1506 Buick Idle Air Control Overspeed Error
Possible causes
– Faulty Idle Air Control (IAC) valve
– Idle Air Control (IAC) valve harness is open or shorted
– Idle Air Control (IAC) valve circuit poor electrical connection
– Idle Air Control (IAC) valve harness is open or shorted
– Idle Air Control (IAC) valve circuit poor electrical connection
Tech description
The P1506 Buick code means that the engine idle is out of factory specification. Sometimes the Idle Air Control (IAC) may have carbon built up. Disconnect the car battery, remove the valve, clean, re-install valve, and drive the vehicle for about 5 minutes with the headlights and A/C ON to get the idle relearned.
If the problem persist, the IAC valve may need to be replaced.
If the problem persist, the IAC valve may need to be replaced.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1506 Buick Description
The P1506 Buick code is set when the Engine Control Module (ECM) detects engine idle speed that is greater than the desired rpm.
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