AutoCodes – Generic – P1507

P1507 Code - Idle Air Control Under Speed 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 stuck closed, IAC valve harness is open or shorted. 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: P1507 indicates Idle Air Control Under Speed Error.
Common causes: Common causes include Faulty Idle Air Control (IAC) valve, IAC valve stuck closed, IAC valve harness is open or shorted.
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 44,299

How popular is this code, among other codes? Medium

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 P1507 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 P1507 - Idle Air Control Under Speed Error - AutoCodes.com — P1507 Code - Idle Air Control Under Speed Error

What does this mean?

What are the Possible Causes of the DTC P1507?

Faulty Idle Air Control (IAC) valve
IAC valve stuck closed
IAC valve harness is open or shorted
IAC valve circuit poor electrical connection

How to Fix the DTC P1507?

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 P1507 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 P1507 code?

Need more information on how to fix the P1507 code? Get Access to Factory Service Manuals

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Information for Specific Makes

P1507 Audi — Idle System Learned Value Lower Limit Attained
P1507 BMW — Idle Speed Control Valve Open Solenoid Control Circuit Signal Low
P1507 Ford — Idle Air Control Under Speed Error
P1507 Hyundai — Idle Speed Control Actuator Signal Low
P1507 Jaguar — Idle Air Control Under Speed Error
P1507 KIA — dle Air Control Valve Closing Coil Voltage Low
P1507 Lexus — PTC AC Auxiliary Heater Disabled Low
P1507 Lincoln — Idle Air Control Under Speed Error
P1507 Mazda — Idle Air Control Under Speed Error
P1507 Mercury — Idle Air Control Under Speed Error
P1507 MINI — Idle Speed Control Valve Open Solenoid Control Circuit Signal Low
P1507 Mitsubishi — Idle Control System RPM Higher Than Expected At Low Temperature
P1507 Subaru — Idle Control System Malfunction Fail Safe
P1507 Volkswagen — Idle System Learned Value Lower Limit Attained

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 P1507 Code

1. What are the common symptoms of OBDII code P1507 (Idle Air Control Under Speed Error)?

- Common symptoms include rough idle, stalling at low speeds, fluctuating idle speed, and possible engine misfires.

2. What are the possible causes of OBDII code P1507?

- Possible causes include a faulty idle air control valve, vacuum leaks, dirty throttle body, issues with the idle air control circuit, or a problem with the engine control module.

3. How can I diagnose the cause of OBDII code P1507?

- Diagnosing the issue typically involves checking for vacuum leaks, inspecting the idle air control valve and circuit, cleaning the throttle body, and using a scan tool to monitor idle speed and IAC operation.

4. Can I drive my vehicle with OBDII code P1507?

- It is not recommended to drive your vehicle with this code as it can lead to poor engine performance, stalling, and potential damage if left unresolved.

5. How can I repair OBDII code P1507?

- Repair options may include cleaning or replacing the idle air control valve, fixing vacuum leaks, cleaning the throttle body, checking and repairing the idle air control circuit, or reprogramming the engine control module.

6. Are there any DIY tips for fixing OBDII code P1507?

- DIY tips include checking for visible vacuum leaks, cleaning the idle air control valve and throttle body, ensuring proper electrical connections, and using a scan tool to reset the code.

7. Can a dirty throttle body cause OBDII code P1507?

- Yes, a dirty throttle body can restrict airflow and cause issues with idle speed control, potentially triggering code P1507.

8. Will OBDII code P1507 cause my check engine light to illuminate?

- Yes, code P1507 is a fault that triggers the check engine light to come on to alert you of an issue with idle air control under speed error.

9. Is it necessary to replace the idle air control valve for OBDII code P1507?

- In some cases, cleaning the idle air control valve may resolve the issue, but if it is faulty or damaged, replacement may be necessary to clear the code.

10. How can I prevent OBDII code P1507 from occurring in the future?

- Regular maintenance, such as cleaning the throttle body and idle air control valve, checking for vacuum leaks, and addressing any engine performance issues promptly, can help prevent code P1507 from occurring.