P0519 GMC Idle Control System Malfunction
Possible causes
– Faulty Idle Air Control Valve
– Vacuum leak
– Idle Air Control Valve harness is open or shorted
– Idle Air Control Valve circuit poor electrical connection
– Vacuum leak
– Idle Air Control Valve harness is open or shorted
– Idle Air Control Valve circuit poor electrical connection
Tech description
Clean Idle Air Control Valve (IACV)
– Warm up Engine
– Remove the intercooler and set aside
– Disconnect the Mass Airflow sensor connector
– Cycle the key “On/Off” once
– Start the car and maintain engine speed between 1000-1500rpm
– Spray engine cleaner on the upper air-stream of the throttle chamber for approximately 10 seconds
– Step engine and let sit for 3 minutes
– Restart engine and maintain 1000 to 1500 rpms
– Spray Engine cleaner on the upper air-stream of the throttle chamber for approximately 10 seconds
– Turn engine off
– Reinstall intercooler and reconnect Mas Airflow sensor connector
– Operate car between 1000-2000rpms until no white smoke appears through tailpipe
– Turn ignition switch off and clear memory
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
GMC Vehicle:GMC Acadia,GMC Canyon,GMC Envoy,GMC Savana 1500,GMC Savana 2500,GMC Savana 3500,GMC Sierra 1500,GMC Sierra 2500 HD,GMC Sierra 3500 HD,GMC Terrain,GMC Yukon,GMC Yukon XL 1500,GMC Yukon XL 2500,