P0509
Idle Air Control System Circuit High
2019-2024 BMW 3 Series G20 2.0L I4 Turbo B48
Moderate SeverityPowertrainGeneric (SAE)
Description
High voltage in IAC circuit.
Symptoms
- High idle
- Racing idle
Common Causes
- Short to power
- Faulty IAC motor
- Open ground
Diagnostic Steps
- Test IAC voltage
- Check for shorts to power
Repair Notes
Replace IAC or repair wiring.
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
P0509 on Other Vehicles
Common Questions
What does code P0509 mean on a 2019-2024 BMW 3 Series G20?
P0509 stands for "Idle Air Control System Circuit High". High voltage in IAC circuit.
What are the symptoms of P0509 on a BMW 3 Series G20?
Common symptoms of P0509 include: High idle, Racing idle.
What causes P0509 on a 2019-2024 BMW 3 Series G20?
Common causes of P0509 include: Short to power, Faulty IAC motor, Open ground.