AutoCodes – Generic – P1506

P1506 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 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 22,541

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 P1506 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 - Idle Air Control Overspeed Error - AutoCodes.com — P1506 Code - Idle Air Control Overspeed Error

What does this mean?

What are the Possible Causes of the DTC P1506?

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?

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 P1506 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 P1506 code?

Need more information on how to fix the P1506 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1506 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1506 Audi — Closed Throttle Position Switch Does Not Open./Short To Ground
P1506 BMW — Idle Speed Control Valve Open Solenoid Control Circuit Signal High
P1506 Ford — Idle Air Control Overspeed Error
P1506 Hyundai — Idle Speed Control Actuator Signal High
P1506 Jaguar — Idle Air Control Overspeed Error
P1506 KIA — Idle Air Control Valve Opening Coil Voltage High
P1506 Lincoln — Idle Air Control Overspeed Error
P1506 Mazda — Idle Air Control Overspeed Error
P1506 Mercury — Idle Air Control Overspeed Error
P1506 MINI — Idle Speed Control Valve Open Solenoid Control Circuit Signal High
P1506 Mitsubishi — Idle Control System RPM Lower Than Expected At Low Temperature
P1506 Volkswagen — Closed Throttle Position Switch Does Not Open./Short To Ground

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 Code

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

- Common symptoms include rough idle, stalling at idle, fluctuating idle speed, and potential engine hesitation.

2. What are the possible causes of OBDII code P1506?

- The causes can include a faulty idle air control (IAC) valve, a vacuum leak, a dirty throttle body, or issues with the engine's air intake system.

3. How can I diagnose OBDII code P1506?

- Diagnosis typically involves checking for vacuum leaks, inspecting the IAC valve for proper operation, cleaning the throttle body, and ensuring the air intake system is free from obstructions.

4. What are the repair options for OBDII code P1506?

- Repair options may include replacing the IAC valve, fixing any vacuum leaks, cleaning the throttle body, or addressing any issues with the air intake system.

5. Can driving with OBDII code P1506 cause further damage to the vehicle?

- Continuing to drive with this code may lead to poor engine performance, decreased fuel efficiency, and potential damage to the engine over time.

6. How urgent is it to repair OBDII code P1506?

- It is recommended to address this code promptly to prevent further issues with engine performance and to avoid potential damage to the vehicle.

7. Can I reset OBDII code P1506 and see if it comes back?

- While you can clear the code temporarily, it is essential to diagnose and repair the underlying issue causing the code to prevent it from reoccurring.

8. Are there any maintenance tips to prevent OBDII code P1506 from happening?

- Regularly maintaining and cleaning the throttle body, inspecting the air intake system, and promptly addressing any engine performance issues can help prevent this code from occurring.

9. Is it possible to drive the vehicle with OBDII code P1506?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue as soon as possible to avoid potential performance issues.

10. Can a DIY enthusiast repair OBDII code P1506, or is it best left to a professional mechanic?

- Depending on your experience and comfort level with automotive repairs, some DIY enthusiasts may be able to address the issues causing this code. However, if unsure, it is best to consult a professional mechanic for proper diagnosis and repair.