P0507 Code: Idle Air Control System RPM Higher Than Expected
🟠 Moderate severity · drivable
Drivable, but the engine idles too fast, which wastes fuel and can feel like the car wants to creep forward.
What P0507 means
The engine is idling faster than the computer expects. Usually this means too much air is getting into the engine at idle — often from a vacuum leak.
Symptoms
- Check engine light is on
- High idle speed
- Engine feels like it's surging
- Car creeps forward at stops
Common causes
- most common: Vacuum leak
- common: Faulty idle air control (IAC) valve
- common: Dirty or sticking throttle body
- less common: Leaking PCV valve or hose
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Find and repair vacuum leaks | Yes | $10–100 |
| Clean the throttle body and idle air control valve | Yes | $10–40 |
| Replace a faulty idle air control valve | Yes | $50–200 |
| Replace a leaking PCV valve | Yes | $10–40 |
Frequently asked questions
Can I drive with a P0507 code?
Yes, but high idle wastes fuel and can make low-speed driving feel odd. Fix it soon.
What is the most common cause of P0507?
A vacuum leak is the most common cause of a high idle — unmetered air getting in after the throttle.
How much does it cost to fix a P0507?
Usually $10–$100 for a vacuum leak fix, or up to $200 if the idle air control valve needs replacing.
Related codes
P0505
P0505 Code: Idle Control System Malfunction
P0506P0506 Code: Idle Air Control System RPM Lower Than Expected
P0171P0171 Code: System Too Lean (Bank 1)
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.