P0507
Idle Control System RPM Higher Than Expected
Moderate· Fix soonDIY friendlyPowertrainGeneric, all makes
What it means
The engine is idling higher than the ECU wants. Usually extra air is getting in from a vacuum leak, or the throttle is not closing fully.
Is it safe to drive?
Drivable. A high idle can make automatic cars creep forward more strongly, so keep a firm foot on the brake.
Symptoms
- High idle speed
- Car pushes forward at stops
- Harsh engagement into gear
Probable causes
Most likely first
- 1Vacuum leak
- 2Dirty throttle body with a sticking plate
- 3Faulty IAC valve stuck open
- 4PCV valve stuck open
- 5Throttle needs relearning after cleaning or battery disconnect
How to diagnose it
Work through these in order before buying parts
- 1Record the code and its freeze frame data (speed, load, temperature when it set), then clear it and see if it comes back.
- 2Listen and smoke-test for vacuum leaks.
- 3Clean the throttle body and perform an idle relearn.
- 4Check the PCV valve.
- 5Check for technical service bulletins (TSBs) or software updates for your make and model; some codes have known factory fixes.
Common fixes
- Repair vacuum leaks
- Clean the throttle body
- Replace the IAC or PCV valve
- Perform an idle relearn
Videos about P0507
This information is general guidance for all makes. Exact causes, specifications and procedures vary by vehicle, so confirm with your service manual or a qualified mechanic before replacing parts.