P0507: Idle Control System RPM Higher Than Expected

P0507 means the engine is idling significantly higher than the ECU expects. Normal idle is typically 600-800 RPM. When the ECU detects idle speed consistently above its target by 200+ RPM and cannot bring it down, it sets P0507. The most common causes are vacuum leaks, dirty throttle body, or a stuck idle air control valve.

P0507 is a fuel system-related diagnostic trouble code classified as moderate severity. When your vehicle's ECU detects this condition, it stores P0507 and illuminates the check engine light.

If your vehicle has triggered P0507, you may notice one or more of these symptoms:

• Check engine light illuminated
• Engine idles noticeably fast (1,000-1,500+ RPM instead of 600-800)
• Harsh engagement when shifting from Park/Neutral to Drive or Reverse
• Higher fuel consumption at idle
• Engine feels like it wants to move forward while stationary (automatic transmission)
• Possible whistling or hissing sound from vacuum leak

Here are the most common causes of P0507, ranked by how likely they are to be the culprit:

Generally yes, for short-term driving. Safe to drive but the high idle wastes fuel and can make the car lurch when shifting into gear. On automatic transmissions, the higher RPM can cause harsh engagement. Fix within a couple of weeks.

Follow these steps to pinpoint the root cause of P0507:

1. Check for vacuum leaks: listen for hissing sounds, spray brake cleaner around intake manifold gaskets and hoses while engine runs. RPM change indicates a leak
2. Inspect throttle body for carbon buildup. Remove intake boot and look inside. Clean with dedicated throttle body cleaner if dirty
3. Check idle RPM with scan tool live data. Note if it drops to normal range after the throttle body cleaning
4. If throttle body is clean and no vacuum leaks, test the IAC valve (if equipped). Command it open/closed with scan tool and listen for operation
5. Check coolant temperature sensor reading vs actual temperature. A faulty sensor reading cold will cause the ECU to command high idle
6. After any repair, perform an idle relearn procedure per manufacturer instructions

Repair costs for P0507 vary depending on the root cause and your vehicle. Here are typical estimates:

P0507 behaves differently depending on your vehicle. Select your car below for model-specific causes, known issues, and adjusted cost estimates:

These codes are often seen alongside P0507 or indicate related issues: