AutoCodes – GMC – P1B39 GMC

P1B39 GMC Code - Battery Energy Control Module Hybrid Battery Voltage Balance Processor 6 Performance

Quick Answer

The hybrid battery pack contains a total of 32 cell groups in the hybrid/EV battery pack assembly. Common causes include Faulty Battery Energy Control Module, Battery Energy Control Module harness is open or shorted, Battery Energy Control Module circuit poor electrical connection. 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: P1B39 GMC indicates Battery Energy Control Module Hybrid Battery Voltage Balance Processor 6 Performance.
Common causes: Common causes include Faulty Battery Energy Control Module, Battery Energy Control Module harness is open or shorted, Battery Energy Control Module circuit poor electrical connection.
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 813

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 Mar 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B39 GMC Description

The hybrid battery pack contains a total of 32 cell groups in the hybrid/EV battery pack assembly. These cell groups are electrically connected in series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 118 V DC. The battery cells are grouped together into two sections, each with 16 cell groups.
The battery energy control module monitors the voltage of the 32 battery cell groups. A voltage sense circuit is attached to each individual cell group. Each of these circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness connectors the voltage sense circuits to the battery energy control module, located directly above the hybrid battery pack.
To ensure proper battery function and lengthen battery life, the battery energy control module balances the voltage of the cells so that each cells maintains the same voltage level. The battery energy control module uses internal voltage gates to transfer voltage from cells with a higher voltage level to those cells with a lower voltage level. To maintain a similar state of charge on the cell groups, the starter/generator control module monitors the cell voltages and determines which cells need energy removed in order to maintain the cells at a similar state of charge. A resistor wired in parallel with the cell and a transistor switch in series with the resistor internal to the battery energy control module. The starter/generator control module sends a command to the battery energy control module to begin cell balancing.

OBDII Code P1B39 GMC - Battery Energy Control Module Hybrid Battery Voltage Balance Processor 6 Performance - AutoCodes.com — P1B39 GMC Code - Battery Energy Control Module Hybrid Battery Voltage Balance Processor 6 Performance

What does this mean?

What are the Possible Causes of the DTC P1B39 GMC?

Faulty Battery Energy Control Module
Battery Energy Control Module harness is open or shorted
Battery Energy Control Module circuit poor electrical connection

How to Fix the DTC P1B39 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 P1B39 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.

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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 P1B39 GMC Code

1. What are the common symptoms of OBDII code P1B39 in a GMC related to the Battery Energy Control Module Hybrid Battery Voltage Balance Processor 6 Performance?

- Common symptoms include reduced hybrid system performance, decreased fuel efficiency, and potential issues with battery charging.

2. What are the possible causes of OBDII code P1B39 in a GMC?

- The code P1B39 can be triggered by issues such as a faulty battery energy control module, hybrid battery voltage imbalance, or problems with the voltage balance processor 6.

3. How can I diagnose the OBDII code P1B39 in my GMC related to the Battery Energy Control Module?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific code, checking the hybrid battery voltage levels, and inspecting the battery energy control module for any signs of damage or malfunction.

4. What are some repair tips for addressing the OBDII code P1B39 in a GMC?

- Repairing this code may involve replacing the faulty battery energy control module, balancing the hybrid battery voltages, or recalibrating the voltage balance processor 6. Consulting a professional mechanic for proper diagnosis and repair is recommended.

5. Can I continue driving my GMC with the OBDII code P1B39 present?

- It is not recommended to continue driving your GMC with the code P1B39 active, as it can lead to further damage to the hybrid system components and potentially affect the vehicle's performance and fuel efficiency.

6. How much does it typically cost to repair the OBDII code P1B39 related to the Battery Energy Control Module in a GMC?

- The cost of repairing the OBDII code P1B39 can vary depending on the specific issue causing the code, the extent of the damage, and the labor rates in your area. It is advisable to get a few quotes from reputable mechanics for an accurate estimate.

7. Can a DIY enthusiast fix the OBDII code P1B39 issue in a GMC?

- While some basic troubleshooting steps can be performed by a DIY enthusiast, repairing the OBDII code P1B39 related to the Battery Energy Control Module generally requires specialized tools and expertise. It is recommended to consult a professional mechanic for proper diagnosis and repair.

8. How long does it take to repair the OBDII code P1B39 in a GMC?

- The repair time for the OBDII code P1B39 can vary depending on the specific issue causing the code and the complexity of the repair. Some repairs may be completed in a few hours, while more extensive repairs could take longer.