What causes P1509 on a Honda?

Carbon-locked IAC valve Open or shorted IAC windings Clogged IAC passages in the throttle body Blown IAC fuse Corroded IAC connector

How do I fix P1509 on a Honda?

Remove and clean the IAC valve and passages Test IAC winding resistance Check the IAC fuse Verify idle control returns after cleaning Replace the valve if cleaning fails

P1509 Idle Air Control Valve Circuit Failure (Honda)

Q: What does P1509 mean on a Honda?

P1509 — Idle Air Control Valve Circuit Failure (Honda). Applies to Civic, Accord, CR-V with IAC valves.

Category: Powertrain - Computer and Auxiliary Controls
Severity: Check Engine Light
Applies to: Civic, Accord, CR-V with IAC valves

What does P1509 mean on a Honda?

P1509 — Idle Air Control Valve Circuit Failure (Honda). This Honda-enhanced code applies to Civic, Accord, CR-V with IAC valves.

Common causes of P1509

Carbon-locked IAC valve
Open or shorted IAC windings
Clogged IAC passages in the throttle body
Blown IAC fuse
Corroded IAC connector

How to fix P1509

Remove and clean the IAC valve and passages
Test IAC winding resistance
Check the IAC fuse
Verify idle control returns after cleaning
Replace the valve if cleaning fails