Engine Error
P0505
Idle Control System Malfunction
Severity
Medium
Symptoms
Engine stalling at idle, high idle, erratic idle surging
Common Causes
- Dirty or failed Idle Air Control (IAC) valve
- Vacuum leak in intake manifold
- Carbon buildup in throttle body
- Faulty coolant temperature sensor
How to Fix
- 1 Clean throttle body and IAC passages
- 2 Replace IAC valve
- 3 Smoke test to find vacuum leaks
- 4 Test ECT sensor
Estimated Repair Cost
USD
$50
–
$350
Cleaning: $50 - $100; IAC Valve replacement: $150 - $350