AutoCodes – GMC – P1B76 GMC

P1B76 GMC Code - Hybrid/Electric Vehicle Battery 49 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: P1B76 GMC indicates Hybrid/Electric Vehicle Battery 49 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 889

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 P1B76 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 P1B76 GMC - Hybrid/Electric Vehicle Battery 49 Circuit Low Voltage - AutoCodes.com — P1B76 GMC Code - Hybrid/Electric Vehicle Battery 49 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B76 GMC?

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

How to Fix the DTC P1B76 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 P1B76 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 P1B76 GMC Code

1. What are the common symptoms of OBDII code P1B76 GMC related to the Hybrid/Electric Vehicle Battery 49 Circuit Low Voltage?

- Common symptoms include reduced battery performance, poor fuel efficiency, and potential issues with starting the vehicle.

2. What are some possible causes of the Hybrid/Electric Vehicle Battery 49 Circuit Low Voltage code (P1B76) in a GMC vehicle?

- Potential causes may include a faulty battery cell, issues with the battery management system, wiring problems, or a failing battery module.

3. How can I diagnose the Hybrid/Electric Vehicle Battery 49 Circuit Low Voltage code in my GMC vehicle?

- Diagnosing this code typically involves using a scan tool to read the specific fault codes, checking the battery voltage levels, inspecting the battery connections, and testing the battery modules.

4. Is it safe to continue driving my GMC vehicle if the P1B76 code related to low voltage in the hybrid/electric battery is present?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the battery system and potentially leave you stranded.

5. What are some repair tips for addressing the Hybrid/Electric Vehicle Battery 49 Circuit Low Voltage code?

- Repair tips may include checking and cleaning battery connections, testing individual battery modules, resetting the battery management system, and replacing any faulty components.

6. Can I reset the OBDII code P1B76 GMC related to low voltage in the hybrid/electric battery on my own?

- While you can attempt to clear the code with an OBDII scanner, it is important to address the underlying issue causing the low voltage condition to prevent the code from reappearing.

7. How much does it typically cost to repair the Hybrid/Electric Vehicle Battery 49 Circuit Low Voltage issue in a GMC vehicle?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve replacing faulty battery components, which can range from a few hundred to over a thousand dollars.

8. Can extreme weather conditions affect the occurrence of the P1B76 code in a GMC hybrid/electric vehicle?

- Yes, extreme temperatures can impact battery performance and lead to issues with voltage levels, potentially triggering the Hybrid/Electric Vehicle Battery 49 Circuit Low Voltage code.

9. Are there any preventive maintenance steps I can take to avoid encountering the P1B76 code in my GMC hybrid/electric vehicle?

- Regularly inspecting and maintaining the battery system, avoiding deep discharges, and keeping the battery charged can help prevent issues that may trigger the low voltage code.

10. How long does it typically take to repair the Hybrid/Electric Vehicle Battery 49 Circuit Low Voltage issue in a GMC vehicle?

- Repair times can vary depending on the extent of the issue and the availability of parts, but it may take a few hours to a day to diagnose and address the low voltage problem.