P1509 OBD Trouble Code

1 result found

P1509 - GM
Type	Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description	Idle Air Control System High RPM Conditions
Cause	Engine runtime 2 minutes, closed throttle, ECT input over 122°F, IAT over 62°F, VSS under 3 mph, then the PCM detected that the Actual idle speed was 175 rpm higher than Desired idle speed