AutoCodes – Ford – P1506 1999 Ford F150

P1506 1999 Ford F150 Code - Idle Air Control Overspeed Error

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 (IAC) valve, IAC valve harness is open or shorted, IAC 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: P1506 1999 Ford F150 indicates Idle Air Control Overspeed Error.
Common causes: Common causes include Faulty Idle Air Control (IAC) valve, IAC valve harness is open or shorted, IAC 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 5,602

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1506 1999 Ford F150 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 P1506 1999 Ford F150 - Idle Air Control Overspeed Error - AutoCodes.com — P1506 1999 Ford F150 Code - Idle Air Control Overspeed Error

What does this mean?

What are the Possible Causes of the DTC P1506 1999 Ford F150?

Faulty Idle Air Control (IAC) valve
IAC valve harness is open or shorted
IAC valve circuit poor electrical connection
Intake leaks
Stuck PCV Valve

How to Fix the DTC P1506 1999 Ford F150?

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 does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1506 1999 Ford F150 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.

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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 P1506 1999 Ford F150 Code

1. What are the common symptoms of OBDII code P1506 in a 1999 Ford F150?

The common symptoms of P1506 include high idle speed, fluctuating idle speed, stalling at idle, and potential rough idling.

2. What causes the Idle Air Control Overspeed Error (P1506) in a 1999 Ford F150?

The P1506 code in a 1999 Ford F150 is typically triggered by a faulty idle air control valve (IAC), a vacuum leak, a dirty throttle body, or a malfunctioning Mass Air Flow (MAF) sensor.

3. How can I diagnose the P1506 code in my 1999 Ford F150?

Diagnosing the P1506 code involves checking the idle air control valve, inspecting for vacuum leaks, cleaning the throttle body, and testing the Mass Air Flow sensor for proper functioning.

4. Can a dirty throttle body cause the P1506 code in a 1999 Ford F150?

Yes, a dirty throttle body can disrupt the airflow and cause the idle air control system to malfunction, leading to the triggering of the P1506 code in a 1999 Ford F150.

5. What is the repair process for fixing the P1506 code in a 1999 Ford F150?

The repair process for the P1506 code involves cleaning or replacing the idle air control valve, fixing any vacuum leaks, cleaning the throttle body, and ensuring proper functioning of the Mass Air Flow sensor.

6. Will driving with the P1506 code in a 1999 Ford F150 cause further damage?

Continuing to drive with the P1506 code may result in poor engine performance, decreased fuel efficiency, and potential damage to other engine components, so it is recommended to address the issue promptly.

7. Can I reset the P1506 code in a 1999 Ford F150 without fixing the underlying issue?

While you can clear the code using an OBDII scanner, it is essential to address the underlying problem causing the P1506 code to prevent it from reoccurring and potentially causing further issues.

8. Is it safe to continue driving my 1999 Ford F150 with the P1506 code?

It is not recommended to drive your 1999 Ford F150 with the P1506 code as it can lead to drivability issues, decreased performance, and potential engine damage if left unresolved.

9. How much does it typically cost to repair the P1506 code in a 1999 Ford F150?

The cost of repairing the P1506 code in a 1999 Ford F150 can vary depending on the specific issue, but it may range from $100 to $500, including parts and labor.

10. Can I prevent the P1506 code from appearing in my 1999 Ford F150?

Regular maintenance, such as cleaning the throttle body, replacing air filters, and checking for vacuum leaks, can help prevent issues that trigger the P1506 code in a 1999 Ford F150.