Chevrolet P1508: Idle Speed Low RPM
Is your scanner showing Chevrolet P1508?
No worries. We'll show you what it means and how to deal with it.
Chevrolet P1508: Idle Speed Low RPM
OVERVIEWWhat Does The Chevrolet P1508 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 lower than the Desired idle speed.
What Are The Potential Causes Of The Chevrolet P1508 Code?
- Base engine problem causing a slow or unstable idle speed
- Fuel system is too rich or too lean
- IAC motor is damaged or has failed (it may be sticking)
- Throttle body plate or bore contaminated with foreign material
- Throttle body adjustment screw tampere 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:
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.
