AutoCodes – Ford – P1504 2011 Ford Fusion

P1504 2011 Ford Fusion Code - Intake Air Control Circuit Malfunction

Quick Answer

The Idle Air Control Valve (IACV) valve assembly controls the engine idle speed and provides a dashpot function. Common causes include Faulty Idle Air Control Valve, Idle Air Control Valve harness is open or shorted, Idle Air Control Valve circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1504 2011 Ford Fusion indicates Intake Air Control Circuit Malfunction.
Common causes: Common causes include Faulty Idle Air Control Valve, Idle Air Control Valve harness is open or shorted, Idle Air Control Valve circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 4,828

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 25, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1504 2011 Ford Fusion Description

The Idle Air Control Valve (IACV) valve assembly controls the engine idle speed and provides a dashpot function. The IAC valve assembly meters intake air around the throttle plate through a bypass within the IAC valve assembly and throttle body. The Powertrain Control Module (PCM) determines the desired idle speed or bypass air and signals the IAC valve assembly through a specified duty cycle. The IAC valve responds by positioning the IAC valve to control the amount of bypassed air. The PCM monitors engine RPM and increases or decreases the IAC duty cycle in order to achieve the desired RPM.

OBDII Code P1504 2011 Ford Fusion - Intake Air Control Circuit Malfunction - AutoCodes.com — P1504 2011 Ford Fusion Code - Intake Air Control Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P1504 2011 Ford Fusion?

Faulty Idle Air Control Valve
Idle Air Control Valve harness is open or shorted
Idle Air Control Valve circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P1504 2011 Ford Fusion?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1504 2011 Ford Fusion code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1504 2011 Ford Fusion code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1504 2011 Ford Fusion Code

1. What does the OBDII code P1504 mean on a 2011 Ford Fusion?

P1504 indicates an Intake Air Control (IAC) Circuit Malfunction, meaning thereâ€™s an issue with the electrical circuit or the IAC valve itself.

2. What are the symptoms of the P1504 code in a 2011 Ford Fusion?

Common symptoms include rough idle, engine stalling, difficulty starting, and fluctuating RPMs at idle.

3. What causes the P1504 code on a 2011 Ford Fusion?

This code can be caused by a faulty IAC valve, damaged wiring or connectors in the IAC circuit, carbon buildup in the IAC valve, or a malfunctioning PCM.

4. Can a dirty IAC valve trigger the P1504 code?

Yes, carbon buildup or debris in the IAC valve can restrict airflow and cause the P1504 code to appear.

5. How do I fix the P1504 code on a 2011 Ford Fusion?

Start by inspecting and cleaning the IAC valve, checking the wiring and connectors for damage, and replacing the IAC valve if necessary. If the issue persists, further diagnose the PCM.

6. Is it safe to drive with a P1504 code?

Driving with a P1504 code may be unsafe due to potential stalling and poor engine performance, especially at idle or low speeds.

7. How do I test the IAC valve for the P1504 code?

You can use a multimeter to check the resistance of the IAC valve and ensure the wiring has proper continuity. Refer to the vehicle's service manual for specific resistance values.

8. Will clearing the P1504 code fix the issue?

Clearing the code may temporarily remove the check engine light, but the underlying issue must be addressed to prevent the code from returning.

9. Can a failing PCM cause the P1504 code?

Although rare, a malfunctioning Powertrain Control Module (PCM) can cause the P1504 code if it fails to properly control the IAC circuit.

10. How much does it cost to repair a P1504 code on a 2011 Ford Fusion?

The cost depends on the root cause. Cleaning the IAC valve may cost little to nothing, while replacing the valve typically ranges from $150 to $300. Additional wiring repairs or PCM replacement can increase costs.