Idle Air Control System Issue - RPM Too High
Code P0507 indicates that the Engine Control Module (ECM) has detected the idle speed is higher than the expected target (typically 700-900 RPM). This is often caused by a vacuum leak, a faulty idle air control valve, throttle body issues, or a stuck open PCV valve. The ECM tries to compensate but cannot bring RPM down, triggering the code.
1. Most Common Causes
- Vacuum leak in intake manifold or connected hoses
- Idle Air Control (IAC) valve dirty, damaged, or stuck open
- Throttle body dirty or damaged with carbon buildup
- Electronic throttle control (ETC) actuator faulty or misadjusted
- Throttle position sensor (TPS) sending incorrect signal
- Fuel pressure regulator causing excessive fuel pressure
- Fuel injectors leaking or clogged with deposits
- Positive Crankcase Ventilation (PCV) system blocked or malfunctioning
- EGR valve stuck partially open
- Throttle cable misadjusted or binding (mechanical throttle systems)
- ECM/PCM failure or outdated software
2. Symptoms You Will Notice
- High idle speed (1000-2000 RPM)
- Check Engine Light illuminated
- Rough idle or surging
- Poor fuel economy
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect vacuum hoses, intake gaskets, and PCV system for leaks.
Step 3: Clean throttle body and IAC valve with appropriate cleaner.
Step 4: Test IAC valve operation with a multimeter or scan tool.
Step 5: Check for ECM updates or perform idle relearn procedure.
4. 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 repair soon.
How much does it cost to fix?▼
Typically $50-$150 for cleaning or replacing the IAC valve or throttle body gasket. More if major vacuum leak repair is needed.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.