Chevrolet P1509: Idle Speed High RPM
Is your scanner showing Chevrolet P1509?
No worries. We'll show you what it means and how to deal with it.
Chevrolet P1509: Idle Speed High RPM
OVERVIEWWhat Does The Chevrolet P1509 Code Mean?
Engine started, engine runtime over 2 minutes, ECT sensor more than 132ºF, IAT sensor more than 68ºF, vehicle speed less than 3 mph with the throttle closed, and the PCM detected the Actual idle speed was 175 rpm higher than the Desired idle speed.
What Are The Potential Causes Of The Chevrolet P1509 Code?
- Base engine problem (engine vacuum leak or PCV valve leak)
- IAC motor is damaged or has failed (it may be sticking)
- IAC motor circuit open, shorted to ground or shorted to power
- Throttle body adjustment screw tampered with or damaged
Recommended Parts
Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:
>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> Walker Products 215-1003 Fuel Injection Idle Air Control Valve
>>> Electric Throttle Body- S20064 ROADFAR
Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!
Reference Sources
GM, 2013, Service Bullettin – Prior To Any Circuit Testing.
