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OBD-II Trouble Shooting Got a code reader? Find out what your GM car's Check Engine light is trying to tell you (and then turn Check Engine light off).

 
 
 
 
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Old 09-24-2009, 09:04 PM   #1
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Default P0507

P0507

Description
IAC SYSTEM RPM HIGH

PCM controls idle speed with an Idle Air Control (IAC) valve
to a calculated RPM based on sensor inputs and actual engine RPM. PCM
moves IAC valve in or out to vary amount of airflow into intake
manifold and thus decrease or increase idle RPM.
PCM commands IAC in counts. A higher count, allows more air
to by-pass throttle plate (higher idle).

Symptoms
You may only notice a high then normal idle

Causes
  • Vacuum leak
  • A faulty (PCV) positive crankcase ventilation valve
  • Dirty throttle body
  • Failed EVAP system
  • Faulty or Failed IAC (idle air controller)
Solutions
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