Powertrain
generic / SAE
P0506
Idle Air Control System RPM Lower Than Expected
The engine idles below the target RPM despite the IAC opening fully. Indicates restricted air path past the IAC — typically a heavily fouled throttle body or stuck IAC valve.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number5 / 06
Possible causes
- Throttle body or idle bypass passage clogged high
- IAC valve stuck mostly closed medium
Symptoms
- Check engine light on
- Idle speed too high, too low, or unstable
- Possible stalling at idle or after cold start
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 20–350 €
- Estimated time: 0.3–2 h
- Component: idle air control valve
- Component: throttle body
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012