B1439 GMC 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 GMC 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.
Code B1439 GMC Description
What are the Possible Causes of the DTC B1439 GMC?
- 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 GMC?
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 GMC 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 GMC code?
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Information for Specific GMC Models
- B1439 2014 GMC Sierra — Intermittent Device Voltage
- B1439 2015 GMC Sierra — Intermittent Device Voltage
- B1439 2016 GMC Sierra — Intermittent Device Voltage
- B1439 2017 GMC Sierra — Intermittent Device Voltage
- B1439 2018 GMC Sierra — Intermittent Device Voltage
Frequently Asked Questions about B1439 GMC Code
1. What does the OBDII code B1439 mean on a GMC vehicle?
The B1439 code indicates "Intermittent Device Voltage," meaning there is an inconsistent voltage signal detected from a certain component or system in the vehicle.
2. What are the common symptoms of the B1439 code in GMC vehicles?
Symptoms may include erratic operation of specific electrical components, warning lights on the dashboard, or noticeable voltage fluctuations.
3. What causes the B1439 code to appear on a GMC vehicle?
Common causes include loose or corroded electrical connections, damaged wiring, a failing sensor or component, or issues with the vehicle’s power supply.
4. Can I drive my GMC with the B1439 code active?
It may be safe to drive in some cases, but ignoring the issue can lead to further electrical problems or component failure. It’s best to address the code promptly.
5. How do I troubleshoot the B1439 code on a GMC?
Begin by checking for loose or corroded connections, inspecting wiring for damage, testing the affected component, and verifying proper voltage supply.
6. What tools are needed to diagnose the B1439 code?
You’ll need an OBDII scanner, a multimeter to check voltage and continuity, and possibly a wiring diagram for the affected system.
7. How can I fix the B1439 code on my GMC?
Repairs may include cleaning or tightening electrical connections, repairing or replacing damaged wiring, or replacing the faulty sensor or component.
8. Could a weak battery cause the B1439 code?
Yes, a weak or failing battery can cause voltage inconsistencies, which might trigger the B1439 code.
9. Does the B1439 code require a trip to the mechanic?
If you’re experienced with electrical diagnostics, you may be able to fix it yourself. Otherwise, a professional mechanic is recommended to ensure proper diagnosis and repair.
10. Will clearing the B1439 code solve the problem?
Clearing the code may temporarily turn off the warning light, but if the root cause isn’t repaired, the code will likely return.
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