AutoCodes – Hummer – P0507 Hummer

P0507 Hummer Code - Idle Speed High

Quick Answer

The Idle Air Control (IAC) Valve is a Powertrain Control Module (PCM) controlled stepper motor located on the Throttle Body. Common causes include Dirty throttle body, Electric throttle control actuator misadjusted or damaged, Faulty Electric throttle control actuator. 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: P0507 Hummer indicates Idle Speed High.
Common causes: Common causes include Dirty throttle body, Electric throttle control actuator misadjusted or damaged, Faulty Electric throttle control actuator.
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 1,501

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 Jun 29, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0507 Hummer Description

The Idle Air Control (IAC) Valve is a Powertrain Control Module (PCM) controlled stepper motor located on the Throttle Body. The stepper motor drives a valve pintle which protrudes into a passage that bypasses the throttle plates. The PCM commands the Idle Air Control Valve pintle to extend to decrease the idle speed. The bypass air flow is reduced and the idle speed decreases as the pintle approaches its seat. The PCM retracts the IAC valve pintle away from its seat to increase the idle speed. The retracting of the IAC valve pintle allows more air to bypass the throttle plates. One of the PCMs uses for the IAC system is to maintain a desired idle speed. The P0507 Diagnostic Trouble Code (DTC) is set when the Powertrain Control Module detects an engine speed outside of the Idle Air Control range of control.

OBDII Code P0507 Hummer - Idle Speed High - AutoCodes.com — P0507 Hummer Code - Idle Speed High

What does this mean?

What are the Possible Causes of the DTC P0507 Hummer?

Dirty throttle body
Electric throttle control actuator misadjusted or damaged
Faulty Electric throttle control actuator
Intake air leak
Poor electrical connection to the Intake Air Control (IAC) valve

How to Fix the DTC P0507 Hummer?

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

If there are no intake leaks, clean the throttle body, adjust the engine idle, and erase the engine code. If the code persists you may have to replace the Electric Throttle Control Actuator (Motor).

The Powertrain Control Module (PCM) learns the idle position of the throttle plate to ensure the correct idle. Anytime the throttle body is cleaned or replaced, the PCM must learn the new throttle position. The idle may be unstable or a DTC may be set if the throttle position is not learned.

HUMMER Throttle Body Cleaning and Idle Learning Procedure

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0507 Hummer 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 P0507 Hummer Code

1. What are the common symptoms of OBDII code P0507 in a Hummer?

- The most common symptom is a high idle speed, typically above the normal range, even when the engine is warm.

2. What are the possible causes of the high idle speed indicated by code P0507 in a Hummer?

- The high idle speed can be caused by a faulty idle air control valve, a vacuum leak, a dirty throttle body, or a malfunctioning throttle position sensor.

3. How can I diagnose the cause of OBDII code P0507 in my Hummer?

- To diagnose the issue, you can start by checking for any vacuum leaks, cleaning the throttle body, inspecting the idle air control valve, and testing the throttle position sensor using a multimeter.

4. Can a high idle speed caused by OBDII code P0507 affect the performance of my Hummer?

- Yes, a high idle speed can lead to poor fuel efficiency, rough idling, and potential stalling issues if left unaddressed.

5. Is it safe to continue driving my Hummer with OBDII code P0507 indicating a high idle speed?

- It is not recommended to drive the vehicle for an extended period with a high idle speed as it can lead to further damage and decreased performance.

6. How can I repair OBDII code P0507 in my Hummer?

- Depending on the underlying cause, the repair may involve replacing the idle air control valve, fixing any vacuum leaks, cleaning the throttle body, or replacing the throttle position sensor.

7. Can a DIY enthusiast fix OBDII code P0507 in a Hummer, or is it better to seek professional help?

- While some simple fixes like cleaning the throttle body can be done by a DIY enthusiast, diagnosing and repairing complex issues may require professional help to ensure proper resolution.

8. Will resetting the OBDII code P0507 in my Hummer make the high idle speed issue disappear?

- Resetting the code may temporarily turn off the check engine light, but the underlying issue causing the high idle speed will persist until properly diagnosed and repaired.

9. How long does it typically take to repair OBDII code P0507 in a Hummer?

- The repair time can vary based on the specific cause of the high idle speed, but it can range from a quick fix like cleaning the throttle body to a more involved repair like replacing a faulty idle air control valve.

10. Are there any preventive measures to avoid encountering OBDII code P0507 and high idle speed in a Hummer?

- Regular maintenance, such as cleaning the throttle body and inspecting for vacuum leaks, can help prevent issues that lead to a high idle speed and OBDII code P0507.