P0507

Idle Air Control System RPM High

🟡 SERVICE SOON POWERTRAIN · Idle Control

PCM commanded idle RPM is lower than actual idle speed — engine idles faster than target.

What You'll Notice
  • High idle — 1,000–2,500 RPM at warm idle when in park
  • Engine surges and hunts at idle
  • Transmission clunk into Drive — higher than normal idle RPM at stop
Probable Causes
  • Vacuum leak (most common) — cracked intake boot, disconnected vacuum line
  • Dirty throttle body — carbon buildup preventing blade from seating
  • IAC (idle air control) valve stuck open
  • Throttle body actuator fault (electronic throttle — DBW vehicles)
Direct Repair Steps
  1. Inspect intake boot for cracks, especially near throttle body clamps
  2. Remove and clean throttle body with throttle body cleaner — do NOT use carburetor cleaner on MAF
  3. Perform throttle body relearn procedure after cleaning (many GM/Toyota models require it)
  4. Test IAC valve resistance (spec: 10–14 Ω typical); replace if out of spec
Vehicles Affected
honda toyota nissan chevy ford
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Quick answers

What does P0507 mean?
PCM commanded idle RPM is lower than actual idle speed — engine idles faster than target.
Is P0507 serious?
It depends on the system and symptoms, but the page ranks the severity and likely causes so you can decide whether to stop driving or continue with caution.
What should I buy before troubleshooting P0507?
A reliable OBD2 scanner helps confirm the code, read live data, and avoid guessing before repairs.

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