AutoCodes – GMC – B1439 2017 GMC Sierra

B1439 2017 GMC Sierra Code - Intermittent Device Voltage

Quick Answer

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. Common causes include Low battery voltage, Faulty Control Module, Control Module 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: B1439 2017 GMC Sierra indicates Intermittent Device Voltage.
Common causes: Common causes include Low battery voltage, Faulty Control Module, Control Module 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 168

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 11, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1439 2017 GMC Sierra Description

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. Damage to components, and incorrect data can occur when the voltage is out of range. The vehicle has multiple Control Modules that will set this Diagnostic Trouble Code (DTC).

OBDII Code B1439 2017 GMC Sierra - Intermittent Device Voltage - AutoCodes.com — B1439 2017 GMC Sierra Code - Intermittent Device Voltage

What does this mean?

What are the Possible Causes of the DTC B1439 2017 GMC Sierra?

Low battery voltage
Faulty Control Module
Control Module harness is open or shorted
Control Module circuit poor electrical connection

How to Fix the DTC B1439 2017 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1439 2017 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 B1439 2017 GMC Sierra code?

Need more information on how to fix the B1439 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1439 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 B1439 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code B1439 in a 2017 GMC Sierra related to intermittent device voltage?

The common symptoms include intermittent electrical issues, such as flickering lights, malfunctioning electronics, or sporadic power loss.

2. What are the typical causes of OBDII code B1439 in a 2017 GMC Sierra?

Possible causes of this code can be loose electrical connections, faulty wiring, a failing voltage regulator, or a malfunctioning control module.

3. How can I diagnose the root cause of OBDII code B1439 in my 2017 GMC Sierra?

To diagnose the issue, you should perform a thorough inspection of the electrical system, check for loose connections, test the voltage regulator, and use a multimeter to measure voltage levels.

4. Can I still drive my 2017 GMC Sierra with OBDII code B1439 present?

It is not recommended to drive the vehicle with this code present, as it can lead to potential electrical failures while driving, posing a safety risk.

5. How can I repair OBDII code B1439 in my 2017 GMC Sierra?

Repairing this code involves fixing any loose connections, replacing faulty wiring, repairing or replacing the voltage regulator, or addressing issues with the control module.

6. Is it necessary to reset the OBDII code B1439 after repairing the issue in a 2017 GMC Sierra?

Yes, it is important to clear the code using an OBDII scanner after making the necessary repairs to ensure the issue has been resolved and to turn off the check engine light.

7. Can extreme weather conditions contribute to triggering OBDII code B1439 in a 2017 GMC Sierra?

Yes, extreme temperatures or weather conditions can sometimes exacerbate electrical issues that lead to the intermittent device voltage problem associated with this code.

8. Will OBDII code B1439 in a 2017 GMC Sierra cause permanent damage to the vehicle if left untreated?

Continued driving with this code present can potentially cause further damage to the electrical system, leading to more significant issues over time if not addressed promptly.

9. Are there any preventive measures to avoid OBDII code B1439 in a 2017 GMC Sierra?

Regularly inspecting and maintaining the electrical components, ensuring secure connections, and addressing any electrical issues promptly can help prevent the occurrence of this code.

10. Can a DIY enthusiast with basic automotive knowledge fix OBDII code B1439 in a 2017 GMC Sierra?

Depending on the root cause and complexity of the issue, a DIY enthusiast with basic automotive knowledge may be able to address simpler issues like loose connections, but more complex problems may require professional assistance.