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P1506 Ford Code - Idle Air Control Overspeed Error

Quick Answer

The P1506 Ford code indicates an Idle Air Control Overspeed Error, which means that the engine's idle speed control system is experiencing an issue with regulating the engine idle speed. Common causes include Dirty or faulty Idle Air Control (IAC) valve, Vacuum leaks in the intake system, Faulty throttle body. 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
P1506 Ford indicates Idle Air Control Overspeed Error.
Common causes
Common causes include Dirty or faulty Idle Air Control (IAC) valve, Vacuum leaks in the intake system, Faulty throttle body.
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 Aug 30, 2024
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Code P1506 Ford Description

The P1506 Ford code indicates an Idle Air Control Overspeed Error, which means that the engine's idle speed control system is experiencing an issue with regulating the engine idle speed. The Idle Air Control (IAC) valve is responsible for adjusting the amount of air entering the engine during idle to maintain a stable idle speed. When this code is triggered, it can lead to erratic idle speeds, stalling, or rough idling. This can affect the vehicle's performance, fuel efficiency, and emissions output.

OBDII Code P1506 Ford - Idle Air Control Overspeed Error
P1506 Ford Code - Idle Air Control Overspeed Error

Common Causes of P1506 Ford

  1. Dirty or faulty Idle Air Control (IAC) valve
  2. Vacuum leaks in the intake system
  3. Faulty throttle body
  4. Wiring issues or electrical connection problems
  5. Engine carbon buildup affecting airflow

Symptoms of P1506 Ford

  1. Rough idling or fluctuating idle speed
  2. Engine stalling at idle
  3. Poor acceleration or throttle response
  4. Check Engine Light illuminated on the dashboard
  5. Increased fuel consumption

How to Fix P1506 Ford

  1. Begin by scanning the vehicle's computer system to confirm the P1506 code and identify any other related codes.
  2. Inspect the Idle Air Control (IAC) valve and clean or replace it if necessary.
  3. Check for vacuum leaks in the intake system and repair any leaks found.
  4. Inspect the throttle body for any faults or carbon buildup and clean or replace it as needed.
  5. Verify proper electrical connections and wiring to the idle control system.

Cost to Fix P1506 Ford

The repair costs for addressing an Idle Air Control Overspeed Error can vary depending on the specific cause of the issue and the labor rates in your area. Typically, the cost for parts such as a new Idle Air Control (IAC) valve can range from $50 to $200, while the labor cost can be between $100 and $200. Overall, the total repair cost could be around $150 to $400. It's recommended to consult with a trusted auto repair shop for a more accurate estimate based on your vehicle's make and model.

What does this mean?

Tech Notes for P1506 Ford

The P1506 code means that the engine idle is out of factory specification. Sometimes the Idle Air Control (IAC) may have carbon built up. Disconnect the car battery, remove the valve, clean, re-install valve, and drive the vehicle for about 5 minutes with the headlights and A/C ON to get the idle relearned.
Also, check for intake leaks or stuck PCV Valve.
If the problem persistss, the IAC valve may need to be replaced.





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When is the Code Detected?

The P1506 code sets when the Powertrain Control Module (PCM) detects an engine idle speed that is greater than the desired RPM.

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Information for Specific Ford Models

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 P1506 Ford Code

1. What are the common symptoms of OBDII code P1506 (Ford) Idle Air Control Overspeed Error?

- Common symptoms include rough idling, engine stalling, fluctuating idle speed, and poor acceleration.

2. What are the possible causes of OBDII code P1506 (Ford) Idle Air Control Overspeed Error?

- Possible causes include a faulty idle air control (IAC) valve, vacuum leaks, dirty throttle body, or issues with the engine's computer system.

3. How can I diagnose OBDII code P1506 (Ford) Idle Air Control Overspeed Error?

- Diagnose the code by checking for vacuum leaks, inspecting the IAC valve and throttle body, performing a scan tool test, and checking the wiring and connections.

4. Can a dirty throttle body cause OBDII code P1506 (Ford) Idle Air Control Overspeed Error?

- Yes, a dirty throttle body can restrict airflow and cause the engine to idle improperly, triggering the P1506 code.

5. How can I repair OBDII code P1506 (Ford) Idle Air Control Overspeed Error?

- Repair options include cleaning or replacing the IAC valve, cleaning the throttle body, fixing any vacuum leaks, and resetting the engine control module.

6. Is it safe to continue driving with OBDII code P1506 (Ford) Idle Air Control Overspeed Error?

- It is not recommended to continue driving with this code as it can lead to engine performance issues and potential stalling, which may compromise safety.

7. Can a DIY enthusiast fix OBDII code P1506 (Ford) Idle Air Control Overspeed Error?

- Yes, many DIY enthusiasts can address this code by following repair guides, using basic tools, and conducting thorough inspections of the components involved.

8. How long does it take to repair OBDII code P1506 (Ford) Idle Air Control Overspeed Error?

- The repair time can vary depending on the exact cause of the issue, but it typically takes a few hours to diagnose and fix the problem.

9. Will resetting the OBDII system clear code P1506 (Ford) Idle Air Control Overspeed Error?

- Resetting the system may temporarily clear the code, but if the underlying issue is not fixed, the code is likely to return after driving the vehicle for some time.

10. Can extreme weather conditions trigger OBDII code P1506 (Ford) Idle Air Control Overspeed Error?

- Yes, extreme cold or hot weather can sometimes exacerbate issues related to idle air control, leading to the triggering of the P1506 code.

Discuss the causes and fixes for P1506 Ford OBDII Code

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  • my 98 ranger is 2.5l 5spd 161k miles. the idle stays up untill i come to a complete stop then it goes down slowly. i've replace the iac and tps. i've cleaned the maf and am getting ready to clean the map.

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  • I also have a 98 Ranger with 3.0L 5 spd 157K miles with the same symptoms. I replaced the IAC with no change and am looking for answers.

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  • Unfortunately never had that problem, but you should also check for intake leaks. Intake air leaks could case the idle to increase and trigger the P1506 code.

    Reply to Comment

  • Ever find out what the problem was?

    Reply to Comment

  • Ever find out the problem?

    Reply to Comment

  • I have a 1999 Ford Ranger, 2.5L engine, 2-wheel drive, 5-speed manual transmission, with no tachometer, it has an electrical speedometer (no cable). The check engine light keeps coming on with the P1506 Idle Air Control Overspeed Error Code. I have cleared the code each time and have disconnected the battery as well. The throttle body has been completely cleaned, all vacuum ports on the throttle body have been cleaned, all vacuum hoses to the throttle body has been cleaned or replaced. The EGR Valve has been replaced, the PCV Valve has been replaced, and the IAC Valve has been tested and replaced twice. The TPS had been tested and calibrated. There are no vacuum leaks. When revving up the engine, it goes to idle slowly. When driving and shifting gears, the engine RPM stays to where it was taken to before shifting to the next gear. In 2nd gear when driving around 25 MPH, I can either push in the clutch or put it in neutral, the engine RPM will not drop to idle, until I come to a complete stop. Shifting the gears is good. I haven't tested the Mass Sensor yet, but I am not getting any other codes, except the P1506.

    Reply to Comment

  • What a stubborn code you have there.
    I haven't had that problem before, so I check a national database of repair for the same model and engine, and here is the lis of the repairs:

    28 - Idle Air Control (IAC)
    10 - Throttle Body
    7 - Throttle Stop Screw
    3 - Idle Air Control (IAC) and Powertrain Control Module (PCM)
    2 - Idle Air Control (IAC) and Throttle Stop Screw
    2 - Idle Air Control (IAC) and PCV Valve

    and this tip:

    Trouble code P1506 suggests that the PCM knows that it cannot control the idle speed to go low.
    An external vacuum leak is not likely to cause this code. Due to the Mass Air Flow (MAF) sensor, an external vacuum leak or air induction leak would typically result in a low idle and lean running condition.

    The only things you didnt mention and is on the list is the Throttle Stop Screw and the PCM. I'll suggest starting by adjusting the Throttle Stop Screw.

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