P1508
Idle Air Control Valve Circuit Open
2016-2021 Honda Civic 2.0L I4
High SeverityPowertrain
Description
Electrical open circuit in the IAC valve coil.
Symptoms
- CEL
- Very low idle
- Stalling at idle
- Surging 1500-1700 RPM
- Only runs with foot on gas
Common Causes
- Faulty IAC valve open circuit
- Damaged wiring
- Corroded connector
- Faulty PCM driver
Diagnostic Steps
- Test IAC resistance
- Inspect wiring
- Check connector
- Test PCM output
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
P1508 on Other Vehicles
Common Questions
What does code P1508 mean on a 2016-2021 Honda Civic?
P1508 stands for "Idle Air Control Valve Circuit Open". Electrical open circuit in the IAC valve coil.
What are the symptoms of P1508 on a Honda Civic?
Common symptoms of P1508 include: CEL, Very low idle, Stalling at idle, Surging 1500-1700 RPM, Only runs with foot on gas.
What causes P1508 on a 2016-2021 Honda Civic?
Common causes of P1508 include: Faulty IAC valve open circuit, Damaged wiring, Corroded connector, Faulty PCM driver.