AutoCodes – GMC – B1439 2014 GMC Sierra

B1439 2014 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 2014 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 184

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 2014 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 2014 GMC Sierra - Intermittent Device Voltage - AutoCodes.com — B1439 2014 GMC Sierra Code - Intermittent Device Voltage

What does this mean?

What are the Possible Causes of the DTC B1439 2014 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 2014 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 2014 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 2014 GMC Sierra code?

Need more information on how to fix the B1439 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the 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 B1439 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code B1439 in a 2014 GMC Sierra?

- Intermittent device voltage issues may cause dashboard warning lights to illuminate, erratic gauge behavior, or electrical component malfunctions.

2. What could be causing the intermittent device voltage problem in a 2014 GMC Sierra?

- Potential causes of B1439 code include faulty wiring connections, a failing voltage regulator, or a malfunctioning battery.

3. How can I diagnose the source of the intermittent device voltage issue in my GMC Sierra?

- A thorough inspection of the electrical system, including checking wiring integrity, testing the battery and alternator, and scanning for other related trouble codes, is recommended.

4. Can I drive my 2014 GMC Sierra with the B1439 code present?

- It is not advisable to drive the vehicle with an intermittent device voltage issue as it can lead to further electrical system damage or sudden breakdowns.

5. Is it safe to reset the B1439 code in my GMC Sierra without addressing the underlying problem?

- Resetting the code without fixing the root cause may temporarily turn off the warning light, but the issue will likely resurface, potentially causing more severe problems.

6. What are some DIY repair tips for addressing the B1439 code in a 2014 GMC Sierra?

- DIY enthusiasts can start by checking and cleaning battery terminals, inspecting wiring harnesses for damage, and ensuring proper grounding connections.

7. How much does it typically cost to repair the intermittent device voltage issue associated with code B1439 in a 2014 GMC Sierra?

- The cost of repair can vary depending on the exact cause of the problem, but it may range from a simple DIY fix to more extensive repairs involving professional diagnosis and component replacement.

8. Can a faulty alternator be the primary culprit behind the B1439 code in a GMC Sierra?

- Yes, a failing alternator can lead to intermittent device voltage issues, causing the B1439 code to trigger in a 2014 GMC Sierra.

9. Will replacing the battery resolve the intermittent device voltage problem indicated by the B1439 code?

- While a failing battery can contribute to voltage irregularities, it is essential to perform a comprehensive diagnosis to ensure that other components like the alternator or wiring are not causing the issue.

10. How soon should I address the B1439 code in my 2014 GMC Sierra to prevent further damage?

- It is recommended to address the intermittent device voltage problem indicated by the B1439 code promptly to prevent potential electrical system failures and costly repairs down the line.