Idle Air Control System RPM Too High
Code P0507 indicates that the Engine Control Module (ECM) has detected the idle speed is higher than the target by a significant margin (typically >200 RPM). This is often caused by unmetered air entering the intake manifold (vacuum leak), a stuck-open idle air control valve, or a throttle body that is dirty or not closing properly. The ECM tries to compensate but cannot reduce RPM below the threshold, triggering the code.
01. Most Common Causes
- Vacuum leak (hose, gasket, PCV valve)
- Dirty or faulty idle air control (IAC) valve
- Throttle body carbon buildup preventing proper closure
- Stuck throttle cable or pedal
- Faulty ECM or wiring issue (rare)
02. Symptoms You Will Notice
- High idle speed (often 1000-2000 RPM)
- Check Engine Light illuminated
- Rough idle or surging
- Poor fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect vacuum hoses, intake gaskets, and PCV valve for leaks.
Step 3: Clean throttle body and IAC valve with appropriate cleaner.
Step 4: Check IAC valve operation with a multimeter or scan tool.
Step 5: Perform idle relearn procedure if repairs were made.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but high idle can affect braking and fuel economy. It's best to diagnose and fix promptly to avoid further issues.
How much does it cost to fix?▼
Typically $50-$150 for cleaning or replacing the IAC valve or throttle body gasket. Major vacuum leak repairs may cost more.