Idle Air Control Circuit Malfunction
2016-2016 Ford Explorer 3.5L V6 EcoBoost
The 2016 Ford Explorer is equipped with a 3.5L V6 turbocharged gasoline engine. Below you'll find detailed p1504 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
The Idle Air Control (IAC) valve circuit has a malfunction. The IAC valve controls engine idle speed by regulating the amount of air bypassing the throttle plate.
Symptoms
- Check Engine Light
- Erratic idle speed
- Idle too high or too low
- Engine stalling at idle
- Rough idle
Common Causes
- Faulty IAC valve
- Carbon buildup on IAC valve or throttle body
- Wiring issue to IAC
- Vacuum leak affecting idle
- Dirty throttle body
Diagnostic Steps
- Test IAC valve resistance
- Clean IAC valve and throttle body
- Inspect IAC wiring and connector
- Check for vacuum leaks
- Monitor IAC duty cycle on scan tool (should be 22-65%)
Repair Notes
Clean throttle body and IAC valve first. Replace IAC if faulty. Repair vacuum leaks.
Related Codes
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
P1504 on Other Vehicles
Common Questions
What does code P1504 mean on a 2016-2016 Ford Explorer?
P1504 stands for "Idle Air Control Circuit Malfunction". The Idle Air Control (IAC) valve circuit has a malfunction. The IAC valve controls engine idle speed by regulating the amount of air bypassing the throttle plate.
What are the symptoms of P1504 on a Ford Explorer?
Common symptoms of P1504 include: Check Engine Light, Erratic idle speed, Idle too high or too low, Engine stalling at idle, Rough idle.
What causes P1504 on a 2016-2016 Ford Explorer?
Common causes of P1504 include: Faulty IAC valve, Carbon buildup on IAC valve or throttle body, Wiring issue to IAC, Vacuum leak affecting idle, Dirty throttle body.
Last updated: March 2026
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