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Trouble code P1509 means: IAC System High RPM

Replace Idle Air Control Valve (IAC)

By TechToolTime:

I must disagree, no codes actually say "replace a component" , they only indicate which circuit is out of parameters. In the case of an IAC fault , it can often be a matter of cleaning the build up carbon / coke in the throttle body and iac passages. A toothbrush and some lacquer thinner / carb cleaner will do wonders. It's also a code that might set for a vacuum leak that's causing a high idle.

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10y ago
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Q: 1996 Chevy Express van code P1509. What are the sensors or solenoids associated with this code.?
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