CarSense › Trouble codes › P0507

P0507: Idle Air Control System RPM Higher Than Expected

What this check-engine code means in plain English, what usually causes it, and what a fix typically costs.

Severity: Monitor — not an emergency, but should be addressed soon

What P0507 means

This code means the engine's idle speed is consistently higher than the manufacturer's specified range. The engine control module (ECM) has detected that the idle RPM cannot be brought down to the target level, even after attempting to compensate through the idle air control system.

What causes P0507?

Likely
Vacuum leakUnmetered air entering the engine through cracked hoses, intake gaskets, or brake booster lines causes the engine to run faster than intended.
Likely
Dirty or faulty idle air control valveCarbon buildup or mechanical failure in the IAC valve prevents proper control of idle air bypass, keeping RPM elevated.
Possible
Throttle body issuesA dirty throttle plate or malfunctioning throttle position sensor can prevent the ECM from properly controlling idle speed.
Less common
PCV system malfunctionA stuck-open PCV valve or faulty crankcase ventilation system can introduce excess air into the intake manifold.

Is P0507 safe to drive?

Drive it?
Usually yes, short-term
Watch for
High idle speed, rough idle, or stalling when coming to a stop
DIY-friendly?
Moderate — checking for vacuum leaks and cleaning the throttle body are DIY-friendly, but diagnosis requires care

You can typically continue driving with this code, as high idle is not immediately dangerous. However, the elevated RPM can increase fuel consumption and engine wear, and may cause lurching when shifting into gear or difficulty controlling speed in parking situations.

P0507 repair cost

~$100 – $500+

Industry-average estimates. Cost depends on the root cause, ranging from simple cleaning or hose replacement to idle air control valve or throttle body replacement.

Which one is it for your car?

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