P0505moderate severityPowertrain
Idle Air Control System
on 2014 Audi A6 3.0L Supercharged V6 · AWD
What this code means
Malfunction in the idle air control (IAC) system.
Symptoms
- Erratic idle speed
- High idle
- Low idle
- Stalling at idle
- Fluctuating RPM
Common causes
- Faulty IAC valve
- Carbon buildup in IAC or throttle body
- Vacuum leak
- PCM issue
Diagnostic steps
- Clean IAC valve and passages
- Clean throttle body
- Test IAC valve operation
- Check for vacuum leaks
- Monitor idle RPM with scan tool
Repair notes
Clean IAC valve and throttle body first. Replace IAC if cleaning fails.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1