What Does P0507 Mean?
The idle air control system is allowing the engine to idle higher than the PCM's target RPM. Despite the PCM commanding the IAC to reduce airflow, the engine RPM remains above the desired idle speed. The driver will notice a high idle (often 1000-1500+ RPM), which may cause the vehicle to creep forward in drive and result in increased fuel consumption.
Common Causes
35%
Vacuum leak allowing excess unmetered air past the throttle plate
25%
Sticking or improperly seating IAC valve stuck in open position
20%
Dirty throttle body preventing the throttle plate from fully closing
10%
Throttle cable or cruise control cable binding, holding throttle slightly open
10%
Incorrect idle relearn or PCM adaptation values after recent service
Diagnostic Steps
1
Monitor desired vs. actual idle RPM and IAC step count — if IAC is commanding fully closed but RPM remains high, air is entering from an uncontrolled source.
2
Perform a smoke test on the entire intake system to identify vacuum leaks — focus on intake manifold gaskets, throttle body gasket, brake booster hose, and any cracked vacuum lines.
3
With the engine idling, carefully spray throttle body cleaner around intake gaskets and vacuum connections — an RPM change indicates a leak at that location.
4
Inspect the throttle body for carbon buildup preventing full plate closure. Check that the throttle cable (if equipped) has proper free play and is not holding the plate open.
5
After addressing the root cause, perform a throttle body relearn / idle relearn procedure to reset the PCM's adaptive idle values.
Estimated Repair Cost
$30 - $350
Parts + labor, varies by vehicle and location
The idle air control system is allowing the engine to idle higher than the PCM's target RPM. Despite the PCM commanding the IAC to reduce airflow, the engine RPM remains above the desired idle speed. The driver will notice a high idle (often 1000-1500+ RPM), which may cause the vehicle to creep forw...
The most common cause of P0507 (Idle Control System RPM Higher Than Expected) is: Vacuum leak allowing excess unmetered air past the throttle plate
Typical repair costs for P0507 range from $30 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A high idle is generally not dangerous but causes the vehicle to creep forward in gear, which requires extra attention at stops. Fuel consumption increases. The condition is drivable but should be addressed promptly to prevent unnecessary drivetrain stress and fuel waste.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0507 to identify the root cause.
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Quick Info
Category
Powertrain
System
Idle Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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