AutoCodes – GMC – P0506 2018 GMC Sierra

P0506 2018 GMC Sierra Code - Idle Speed Low

Quick Answer

The Engine Control Module (ECM) is the control center for the Throttle Actuator Control (TAC) system. Common causes include Dirty Throttle Body, Intake air leak, Throttle Body misadjusted or damaged. 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: P0506 2018 GMC Sierra indicates Idle Speed Low.
Common causes: Common causes include Dirty Throttle Body, Intake air leak, Throttle Body misadjusted or damaged.
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 393

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
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0506 2018 GMC Sierra Description

The Engine Control Module (ECM) is the control center for the Throttle Actuator Control (TAC) system. The ECM determines the driver's intent based on input from the accelerator pedal position sensors, then calculates the appropriate throttle response based on the throttle position sensors. The Direct Current (DC) motor, located in the Throttle Body Assembly, drives the throttle blade. In order to decrease idle speed, along with spark and fuel delivery changes the ECM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the ECM commands the throttle plate open allowing more air to pass the throttle plate. The Diagnostic Trouble Code (DTC) will be set when the actual idle speed is approximately 94 RPM lower than the desired idle speed.

OBDII Code P0506 2018 GMC Sierra - Idle Speed Low - AutoCodes.com — P0506 2018 GMC Sierra Code - Idle Speed Low

What does this mean?

What are the Possible Causes of the DTC P0506 2018 GMC Sierra?

Dirty Throttle Body
Intake air leak
Throttle Body misadjusted or damaged
Faulty Electric Throttle Actuator Motor (Located in the Throttle Body Assembly)
Electric Throttle Actuator Motor harness is open or shorted
Electric Throttle Actuator Motor circuit poor electrical connection

How to Fix the DTC P0506 2018 GMC Sierra?

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 clear the engine code. If the code persists you must replace the Electric Throttle Actuator Motor (Located in the Throttle Body Assembly).

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

Chevrolet Throttle Body Cleaning and Idle Learning Procedure

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0506 2018 GMC Sierra 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 P0506 2018 GMC Sierra code?

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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 P0506 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P0506 (Idle Speed Low) in a 2018 GMC Sierra?

Symptoms may include rough idling, stalling at low speeds, poor acceleration, and the Check Engine light illuminating.

2. What are the possible causes of OBDII code P0506 in a 2018 GMC Sierra?

Common causes include a dirty or faulty idle air control valve, vacuum leaks, throttle body issues, or a malfunctioning mass airflow sensor.

3. How can I diagnose the cause of OBDII code P0506 in my 2018 GMC Sierra?

Diagnosis typically involves using an OBDII scanner to retrieve the code, inspecting the idle air control valve and related components, checking for vacuum leaks, and testing the throttle body and mass airflow sensor.

4. Is it safe to drive my 2018 GMC Sierra with OBDII code P0506 (Idle Speed Low)?

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

5. What are some DIY repair tips for addressing OBDII code P0506 in a 2018 GMC Sierra?

DIY repair tips may include cleaning or replacing the idle air control valve, checking and repairing any vacuum leaks, cleaning the throttle body, and inspecting the mass airflow sensor.

6. Can OBDII code P0506 in a 2018 GMC Sierra be triggered by a dirty throttle body?

Yes, a dirty throttle body can restrict airflow and cause the engine to idle too low, triggering the P0506 code. Cleaning the throttle body may help resolve the issue.

7. How important is it to address OBDII code P0506 promptly in a 2018 GMC Sierra?

Prompt attention to this code is crucial to prevent further damage to the engine, ensure optimal performance, and maintain fuel efficiency in your GMC Sierra.

8. Will resetting the OBDII code P0506 in a 2018 GMC Sierra make it go away permanently?

Resetting the code may temporarily turn off the Check Engine light, but if the underlying issue causing the code is not fixed, it will likely reappear upon driving the vehicle again.

9. Can a malfunctioning mass airflow sensor cause OBDII code P0506 in a 2018 GMC Sierra?

Yes, a malfunctioning mass airflow sensor can disrupt the air-fuel mixture, leading to low idle speed and triggering the P0506 code in your GMC Sierra.

10. Is it necessary to seek professional help for diagnosing and repairing OBDII code P0506 in a 2018 GMC Sierra?

If you are not confident in diagnosing or repairing the issue yourself, it is recommended to seek professional help from a certified mechanic to properly address the P0506 code in your GMC Sierra.