P1508
Idle Air Control Valve Circuit Malfunction
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)
Symptoms
- Unstable idle speed
- Engine stalls at idle
- Floating speed when warming up
- Increased vibration at idle
- Check Engine light comes on
Causes
- Idle air valve malfunction
- Open or short circuit in control circuit
- Valve dirty or stuck
- Valve connector problems
- Engine ECU malfunction
How to Fix
- Check the condition of the idle air valve
- Check the integrity of the control circuit and connectors
- Clean the valve from dirt
- Replace valve if necessary
- Check the operation of the system after repair