P0511
PowertrainIdle Speed Controlmoderate severityIdle Air Control Valve Circuit
What P0511 Means
There is a fault in the idle air control valve circuit. The PCM cannot properly manage engine idle airflow.
Symptoms
- Rough or unstable idle
- Stalling at idle
- Check engine light on
Common Causes
- Faulty idle air control valve
- Carbon buildup in IAC passage
- Wiring or connector fault
- Bad PCM
Diagnostic Steps
- Read code and observe idle behavior
- Inspect IAC wiring and connector
- Clean or test IAC valve
- Replace IAC valve and retest
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