Idle Air Control System RPM Higher Than Expected
Fix P0507 high idle code. Learn what causes idle RPM higher than commanded and how to find vacuum leaks.
Engine Problems
Symptoms
- 1Check engine light on
- 2Idle higher than normal
- 3Idle doesn't return to normal when stopping
- 4Slight surging at idle
- 5Hissing sound from a vacuum leak
Common Causes
- 1Vacuum leak (hoses, gaskets, intake)
- 2Dirty throttle body or IAC valve
- 3Sticking idle air control valve
- 4Throttle body needs relearn procedure
- 5Faulty PCV system
How to Fix
- 1Inspect for vacuum leaks and smoke test
- 2Clean the throttle body and IAC valve
- 3Check the PCV valve and hoses
- 4Perform the throttle relearn procedure
- 5Replace the IAC valve if sticking
What Does P0507 Mean?
The P0507 code indicates that the engine's idle speed is higher than the ECM commanded. The ECM controls idle through the idle air control valve or electronic throttle, and a higher idle suggests extra unmetered air.The Most Common Cause
Vacuum leaks are the leading cause. Any unmetered air entering after the throttle plate raises idle above the target.Other Contributors
A dirty throttle body, sticking IAC valve, or a throttle body that needs relearning can also cause high idle.How AI4Car Helps
AI4Car can display commanded versus actual idle RPM and fuel trims, helping you spot a vacuum leak or a throttle body that needs cleaning.Related Codes
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