Engine-Codes.com
Engine-Codes – Ford – P1504 1999 Ford F150

P1504 1999 Ford F150 Code - Intake Air Control Circuit Malfunction

Quick Answer

The P1504 diagnostic trouble code (DTC) for a 1999 Ford F150 indicates an Intake Air Control Circuit Malfunction. Common causes include Faulty intake air control valve, Damaged wiring or connectors in the circuit, Malfunctioning engine control module (ECM). 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 1999 Ford F150 indicates Intake Air Control Circuit Malfunction.
Common causes
Common causes include Faulty intake air control valve, Damaged wiring or connectors in the circuit, Malfunctioning engine control module (ECM).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P1504 1999 Ford F150 Description

The P1504 diagnostic trouble code (DTC) for a 1999 Ford F150 indicates an Intake Air Control Circuit Malfunction. This code is specifically related to the vehicle's intake air control system, which is responsible for regulating the amount of air entering the engine. The intake air control circuit is a crucial component of the engine management system, as it ensures the proper air-to-fuel ratio for combustion.

OBDII Code P1504 1999 Ford F150 - Intake Air Control Circuit Malfunction
P1504 1999 Ford F150 Code - Intake Air Control Circuit Malfunction

Common Causes of P1504 1999 Ford F150

  1. Faulty intake air control valve
  2. Damaged wiring or connectors in the circuit
  3. Malfunctioning engine control module (ECM)
  4. Vacuum leaks in the intake system
  5. Clogged air filter restricting airflow

Symptoms of P1504 1999 Ford F150

  1. Rough idling
  2. Stalling
  3. Hesitation during acceleration
  4. Lack of power
  5. Check Engine Light illuminated

How to Fix P1504 1999 Ford F150

  1. Begin by conducting a visual inspection of the intake air control valve, wiring, and connectors for any visible damage or corrosion.
  2. Use a multimeter to test the intake air control valve for proper functionality and continuity.
  3. Check for vacuum leaks in the intake system by performing a smoke test or using a vacuum gauge.
  4. Replace any faulty components such as the intake air control valve, damaged wiring, or connectors.
  5. Clear the DTC with a scan tool and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix P1504 1999 Ford F150

The typical repair costs for addressing a P1504 code in a 1999 Ford F150 can vary depending on the specific cause of the issue. In general, the cost of parts such as an intake air control valve or wiring harness can range from $50 to $200. Labor costs at most auto repair shops typically range from $80 to $150 per hour, with the total repair time depending on the complexity of the issue. Overall, the total cost of repairs for a P1504 code could range from $150 to $500, including parts and labor. It's advisable to check with local auto repair shops for more accurate estimates based on your specific situation.

What does this mean?

Tech Notes for P1504 1999 Ford F150

The Idle Air Control solenoid resistance is from 6 to 13 ohms.

When is the Code Detected?

Powertrain Control Module (PCM) has detected an electrical load failure on the Idle Air Control Valve (IACV) circuit.

Need more information about the P1504 1999 Ford F150 code?

Need more information on how to fix the P1504 1999 Ford F150 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1504 1999 Ford F150 code diagnosed by a professional: Find a repair shop in your area

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 1999 Ford F150 Code

1. What are the common symptoms of OBDII code P1504 on a 1999 Ford F150?

- Common symptoms include rough idling, stalling, poor engine performance, and possible engine hesitation.

2. What can cause the OBDII code P1504 on a 1999 Ford F150?

- The code P1504 typically indicates an issue with the intake air control circuit, which can be caused by a faulty idle air control valve, wiring issues, or a vacuum leak.

3. How can I diagnose the intake air control circuit malfunction causing OBDII code P1504 on my 1999 Ford F150?

- You can start by checking the idle air control valve for proper operation, inspecting the wiring for any damage, and using a vacuum gauge to identify potential leaks.

4. Can a dirty or clogged air filter trigger the OBDII code P1504 on a 1999 Ford F150?

- While a dirty or clogged air filter can affect engine performance, it is not a direct cause of the intake air control circuit malfunction indicated by code P1504.

5. What are some repair tips for fixing the intake air control circuit malfunction causing OBDII code P1504 on a 1999 Ford F150?

- Repair tips include cleaning or replacing the idle air control valve, repairing any damaged wiring, and addressing any vacuum leaks in the intake system.

6. Will driving with the OBDII code P1504 on a 1999 Ford F150 cause further damage to the vehicle?

- Continuing to drive with code P1504 may lead to worsened engine performance and potential damage over time, so it is recommended to address the issue promptly.

7. Can resetting the OBDII code P1504 on a 1999 Ford F150 make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue causing code P1504 is not fixed, the code is likely to reappear.

8. Is it safe to ignore the OBDII code P1504 on a 1999 Ford F150 if the vehicle seems to be running fine?

- Ignoring code P1504 can lead to decreased fuel efficiency, engine performance issues, and potential long-term damage, so it is not recommended to ignore the code.

9. How much does it typically cost to repair the intake air control circuit malfunction causing OBDII code P1504 on a 1999 Ford F150?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from around $100 for a simple fix to a few hundred dollars for more complex repairs.

10. Can a DIY enthusiast with basic automotive knowledge fix the intake air control circuit malfunction causing OBDII code P1504 on a 1999 Ford F150?

- Depending on the specific issue, a DIY enthusiast may be able to perform basic troubleshooting and repairs like cleaning or replacing the idle air control valve, but more complex issues may require professional assistance.

Discuss the causes and fixes for P1504 1999 Ford F150 OBDII Code

Submit a New Comment

Code P1504 1999 Ford F150 comments

No comments found for this page.