AutoCodes – GMC – P0B79 GMC

P0B79 GMC Code - Hybrid/Electric Vehicle Battery 13 Circuit Low Voltage

Quick Answer

The Hybrid/Electric Vehicle battery pack contains 288 cells. Common causes include Faulty Hybrid/Electric Vehicle Battery Pack, Faulty Hybrid/Electric Vehicle Battery Interface Control Module. 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: P0B79 GMC indicates Hybrid/Electric Vehicle Battery 13 Circuit Low Voltage.
Common causes: Common causes include Faulty Hybrid/Electric Vehicle Battery Pack, Faulty Hybrid/Electric Vehicle Battery Interface Control Module.
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 881

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B79 GMC Description

The Hybrid/Electric Vehicle battery pack contains 288 cells. Groups of three cells are welded together in parallel. There are a total of 96 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 355 V direct current. The battery cells are also grouped together into three sections. The first 90 cells/30 cell groups make up battery section one. This section is adjacent to the cowl and contains batteries 67 through to 96. Battery section two is located behind section one. It is made up of 72 cells/24 cell groups and contains batteries 43 through to 66. The transverse battery section is section number three, it is made up of the remaining 126 cells/42 cell groups and contains batteries 1 through to 42. The three battery sections are individually serviceable components.
The battery energy control module monitors the voltage of the 96 battery cell groups through the four hybrid/EV battery interface control modules. Voltage sense circuits are attached to each individual cell group, and these sense circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness joins this connector to a hybrid/EV battery interface control module, also located on the top surface of the battery section. The hybrid/EV battery interface control module encodes the voltage reading and transmits it to the battery energy control module through the battery control harness. There is one hybrid/EV battery interface control module located on battery sections one and two, and two hybrid/EV battery interface control modules associated with battery section three. The hybrid/EV battery interface control module, battery energy control module wiring harness, auxiliary battery wiring harness, and battery energy control module are all considered serviceable components.
The battery energy control module will determine when a fault condition is present. Diagnostics and system status are communicated from the battery energy control module to hybrid/EV powertrain control module 2 through serial data. The hybrid/EV powertrain control module 2 is the host controller for diagnostic trouble code information.

OBDII Code P0B79 GMC - Hybrid/Electric Vehicle Battery 13 Circuit Low Voltage - AutoCodes.com — P0B79 GMC Code - Hybrid/Electric Vehicle Battery 13 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0B79 GMC?

Faulty Hybrid/Electric Vehicle Battery Pack
Faulty Hybrid/Electric Vehicle Battery Interface Control Module

How to Fix the DTC P0B79 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 P0B79 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 P0B79 GMC Code

1. What are common symptoms of OBDII code P0B79 GMC indicating Hybrid/Electric Vehicle Battery 13 Circuit Low Voltage?

- Common symptoms include reduced electric vehicle range, poor performance, and potential inability to start the vehicle.

2. What can cause the OBDII code P0B79 GMC related to Hybrid/Electric Vehicle Battery 13 Circuit Low Voltage?

- Possible causes include a faulty hybrid/electric vehicle battery, damaged battery wiring, or issues with the battery management system.

3. How can I diagnose the OBDII code P0B79 GMC for Hybrid/Electric Vehicle Battery 13 Circuit Low Voltage?

- Diagnosing this code may require specialized diagnostic equipment to test the hybrid/electric vehicle battery, inspect wiring connections, and analyze the battery control module.

4. Can a DIY enthusiast repair OBDII code P0B79 GMC for Hybrid/Electric Vehicle Battery 13 Circuit Low Voltage?

- Repairing this code may be challenging for DIY enthusiasts due to the complexity of hybrid/electric vehicle systems. It is recommended to seek professional assistance.

5. Is it safe to continue driving with the OBDII code P0B79 GMC indicating Hybrid/Electric Vehicle Battery 13 Circuit Low Voltage?

- It is not recommended to continue driving with this code present, as it can lead to further damage to the hybrid/electric vehicle battery system and potentially compromise safety.

6. How much does it typically cost to repair OBDII code P0B79 GMC for Hybrid/Electric Vehicle Battery 13 Circuit Low Voltage?

- Repair costs can vary depending on the specific issue causing the code, but they may range from a few hundred to a few thousand dollars, including parts and labor.

7. Can a faulty hybrid/electric vehicle battery be repaired, or does it need to be replaced?

- In most cases, a faulty hybrid/electric vehicle battery will need to be replaced rather than repaired due to the complexity and safety considerations of these high-voltage systems.

8. Are there any preventive maintenance tips to avoid triggering the OBDII code P0B79 GMC for Hybrid/Electric Vehicle Battery 13 Circuit Low Voltage?

- Regularly scheduled maintenance, such as checking and maintaining the hybrid/electric vehicle battery cooling system, can help prevent issues that may trigger this code.

9. How long does it typically take to repair the OBDII code P0B79 GMC related to Hybrid/Electric Vehicle Battery 13 Circuit Low Voltage?

- The repair time can vary depending on the specific problem, availability of parts, and technician expertise, but it may take a few hours to a full day to complete the repair.

10. Can resetting the OBDII code P0B79 GMC resolve the issue temporarily, or is it necessary to address the underlying problem?

- Simply resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the code. It is essential to address the root cause of the problem for a lasting solution.