What causes P1504 on a Ford?

Open or shorted IAC valve windings Carbon-locked IAC pintle Damaged IAC wiring or connector Blown IAC circuit fuse PCM driver fault

How do I fix P1504 on a Ford?

Measure IAC winding resistance against spec Remove and clean carbon from the valve and passages Check fuse and supply voltage at the valve Inspect wiring and connector Replace the valve after confirming power and command

P1504 Intake Air Control Circuit Malfunction

Q: What does P1504 mean on a Ford?

P1504 — Intake Air Control Circuit Malfunction. Applies to F-150, Mustang, Ranger, Explorer with IAC valves.

Category: Powertrain - Computer and Auxiliary Controls
Severity: Check Engine Light
Applies to: F-150, Mustang, Ranger, Explorer with IAC valves

What does P1504 mean on a Ford?

P1504 — Intake Air Control Circuit Malfunction. This Ford-enhanced code applies to F-150, Mustang, Ranger, Explorer with IAC valves.

Common causes of P1504

Open or shorted IAC valve windings
Carbon-locked IAC pintle
Damaged IAC wiring or connector
Blown IAC circuit fuse
PCM driver fault

How to fix P1504

Measure IAC winding resistance against spec
Remove and clean carbon from the valve and passages
Check fuse and supply voltage at the valve
Inspect wiring and connector
Replace the valve after confirming power and command