Idle RPM Higher Than Expected
P0507 means the engine is idling above the target RPM even though the computer is trying to control idle speed.
High idle can make the car harder to control at stops and may point to an air leak or throttle issue.
Common symptoms
- High idle
- Surging idle
- Check engine light
- Hard shifts into gear
- Whistling vacuum leak sound
Likely causes
- Vacuum leak
- Dirty throttle body
- Sticking throttle plate
- Idle air control valve issue
- PCV leak
What to check before replacing parts
Check for vacuum leaks
Look for: A hiss at idle, or a smoke-test leak at a hose, gasket, or intake fitting, lets in extra air the idle control can't fully compensate for, pushing idle speed above target.
Inspect and clean the throttle body if appropriate
Look for: Carbon buildup around the throttle plate can actually hold the plate slightly open, letting in more air than commanded — a plate that doesn't close fully against its stop when clean confirms this.
Check PCV hoses
Look for: A disconnected, cracked, or oversized/aftermarket PCV hose draws in extra unmetered air, similar to a vacuum leak, and raises idle speed.
Review throttle and idle control data on a scan tool
Look for: Compare commanded idle air control position/duty cycle to actual RPM — if the idle control is at a low or minimum command but RPM is still high, the extra air is coming from an uncontrolled leak, not the idle control valve itself.
Perform an idle relearn when required
Look for: If idle stays high after a repair (throttle cleaning, battery disconnect, etc.), the computer may need to relearn its idle position — if a relearn brings RPM back to normal, the mechanical fix was correct and nothing further is needed.
This page explains the generic P0507 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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