Engine Error
P0511
Idle Air Control Circuit
Severity
Medium
Symptoms
Engine stalling at stops, abnormally high or low idle, check engine light
Common Causes
- Defective Idle Air Control (IAC) valve
- Open or shorted IAC wiring
- Carbon buildup in throttle body
- Faulty PCM
How to Fix
- 1 Test and replace IAC valve
- 2 Repair wiring harness
- 3 Clean throttle body and IAC passages
- 4 Test PCM output to IAC
Estimated Repair Cost
USD
$50
–
$250
Throttle body clean: $80; IAC Valve: $150 - $250