What causes P1508 on a Honda?

Failed idle air control valve Carbon blocked idle passages Damaged IAC wiring or plug Blown FI fuse Faulty engine control module driver

How do I fix P1508 on a Honda?

Check the FI fuse first Inspect IAC plug and wiring Remove and clean idle passages Test IAC coil resistance Replace the IAC valve if circuit tests fail

P1508 Idle air control valve circuit fault

Q: What does P1508 mean on a Honda?

P1508. Idle air control valve circuit fault. Applies to 1996 to 2001 Civic, Integra and CR-V.

Category: Powertrain - Computer and Auxiliary Controls
Severity: Check Engine Light
Applies to: 1996 to 2001 Civic, Integra and CR-V

What does P1508 mean on a Honda?

P1508. Idle air control valve circuit fault. This Honda-enhanced code applies to 1996 to 2001 Civic, Integra and CR-V.

Common causes of P1508

Failed idle air control valve
Carbon blocked idle passages
Damaged IAC wiring or plug
Blown FI fuse
Faulty engine control module driver

How to fix P1508

Check the FI fuse first
Inspect IAC plug and wiring
Remove and clean idle passages
Test IAC coil resistance
Replace the IAC valve if circuit tests fail

Sources and review

Last updated 2026-09-24.