Possible causes – Idle Air Control Valve harness is open or shorted– Idle Air Control Valve circuit poor electrical connection– Faulty Idle Air Control Valve When is the code detected? Powertrain Control Module (PCM) has detected an electrical load failure
Possible causes – Idle Air Control Valve harness is open or shorted– Idle Air Control Valve circuit poor electrical connection– Faulty Idle Air Control Valve Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1504 Description The Idle
P1504 BUICK – Vehicle Speed Output Circuit
P1504 CADILLAC – Vehicle Speed Output Circuit
P1504 CHEVROLET – Vehicle Speed Output Circuit
P1504 GMC – Vehicle Speed Output Circuit
P1504 HYUNDAI – Inhibitor Switch