OBD-II code · Powertrain (generic)
P0507 Idle Air Control System RPM Higher Than Expected
Idle RPM exceeds the target despite the IAC commanded fully closed. Almost always caused by a vacuum leak that lets air bypass the IAC — torn intake hose, leaking PCV, brake booster, or intake manifold gasket.
Is it safe to drive with P0507?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyVacuum leak bypassing IAC
- PossiblePCV valve stuck open
- PossibleBrake booster diaphragm leaking
Symptoms
- Check engine light on
- Idle speed too high, too low, or unstable
- Possible stalling at idle or after cold start
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–4 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Intake Manifold, Pcv Valve, Brake Booster, Vacuum Hose
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.