P0505
Idle Air Control System
2019-2024 BMW 3 Series G20 2.0L I4 Turbo B48
Moderate SeverityPowertrainGeneric (SAE)
Description
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.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P0505 on Other Vehicles
Common Questions
What does code P0505 mean on a 2019-2024 BMW 3 Series G20?
P0505 stands for "Idle Air Control System". Malfunction in the idle air control (IAC) system.
What are the symptoms of P0505 on a BMW 3 Series G20?
Common symptoms of P0505 include: Erratic idle speed, High idle, Low idle, Stalling at idle, Fluctuating RPM.
What causes P0505 on a 2019-2024 BMW 3 Series G20?
Common causes of P0505 include: Faulty IAC valve, Carbon buildup in IAC or throttle body, Vacuum leak, PCM issue.