AutoCodes – Generic – B1439

B1439 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 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 5,173

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 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 - Intermittent Device Voltage - AutoCodes.com — B1439 Code - Intermittent Device Voltage

What does this mean?

What are the Possible Causes of the DTC B1439?

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?

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 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 code?

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

Need Help with the Code?

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

Information for Specific Makes

B1439 Buick — Intermittent Device Voltage
B1439 Cadillac — Intermittent Device Voltage
B1439 Chevrolet — Intermittent Device Voltage
B1439 GMC — Intermittent Device Voltage

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 Code

1. What are the common symptoms of OBDII code B1439 (Intermittent Device Voltage)?

- Common symptoms include intermittent power loss, electrical issues, and warning lights on the dashboard.

2. What are the possible causes of OBDII code B1439?

- The code B1439 can be caused by loose or corroded electrical connections, a failing power supply, or a faulty device drawing excessive voltage.

3. How can I diagnose the source of OBDII code B1439?

- To diagnose the code B1439, you can use a multimeter to test the voltage at various points in the electrical system, inspect wiring for damage, and check the connections to the affected device.

4. What should I do if I encounter OBDII code B1439 while driving?

- If you encounter code B1439 while driving, it is recommended to safely pull over, turn off the vehicle, and check for any visible signs of electrical issues before attempting to restart the engine.

5. Can I continue driving with OBDII code B1439 present?

- It is not recommended to continue driving with code B1439 present, as it can lead to further electrical problems and potential safety hazards on the road.

6. How can I repair OBDII code B1439?

- Repairing code B1439 involves identifying and addressing the root cause of the intermittent device voltage issue, which may require repairing or replacing faulty wiring, connectors, or the affected device itself.

7. Is it safe to reset the OBDII code B1439 without addressing the underlying issue?

- Resetting the code without addressing the underlying issue may temporarily turn off the warning light, but the problem will likely resurface until the root cause is properly diagnosed and repaired.

8. Can extreme weather conditions trigger OBDII code B1439?

- Yes, extreme weather conditions such as extreme heat or cold can sometimes exacerbate electrical issues leading to code B1439 due to changes in voltage levels and increased stress on the electrical system.

9. Will disconnecting the battery reset OBDII code B1439?

- Disconnecting the battery may reset the code temporarily, but it is not a permanent solution as the underlying issue causing the intermittent device voltage will persist until properly addressed.

10. How can I prevent OBDII code B1439 from recurring in the future?

- To prevent code B1439 from recurring, it is essential to perform regular maintenance checks on the electrical system, keep connections clean and secure, and address any electrical issues promptly to avoid voltage fluctuations.