P1509
Idle Air Control Valve Circuit Short
2016-2021 Honda Civic 2.0L I4
High SeverityPowertrain
Description
Short circuit in the IAC valve coil.
Symptoms
- CEL
- Erratic idle
- RPM bouncing
- Stalling at idle
Common Causes
- Faulty IAC valve internal short
- Shorted wiring
- Damaged connector
Diagnostic Steps
- Test IAC resistance
- Check for shorts
- Inspect connector
- Test PCM driver
Repair Notes
Replace IAC valve.
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
P1509 on Other Vehicles
Common Questions
What does code P1509 mean on a 2016-2021 Honda Civic?
P1509 stands for "Idle Air Control Valve Circuit Short". Short circuit in the IAC valve coil.
What are the symptoms of P1509 on a Honda Civic?
Common symptoms of P1509 include: CEL, Erratic idle, RPM bouncing, Stalling at idle.
What causes P1509 on a 2016-2021 Honda Civic?
Common causes of P1509 include: Faulty IAC valve internal short, Shorted wiring, Damaged connector.