AutoCodes – Generic – P1B76

P1B76 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 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 3,098

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

What does this mean?

What are the Possible Causes of the DTC P1B76?

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

How to Fix the DTC P1B76?

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 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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Need Help with the Code?

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Information for Specific Makes

P1B76 Buick — Hybrid/Electric Vehicle Battery 49 Circuit Low Voltage
P1B76 Cadillac — Hybrid/Electric Vehicle Battery 49 Circuit Low Voltage
P1B76 Chevrolet — Hybrid/Electric Vehicle Battery 49 Circuit Low Voltage
P1B76 GMC — Hybrid/Electric Vehicle Battery 49 Circuit Low Voltage
P1B76 Saturn — Hybrid/Electric Vehicle Battery 49 Circuit Low 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 P1B76 Code

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

- Common symptoms include decreased power and acceleration, reduced fuel efficiency, and potential inability to start the vehicle.

2. What are the possible causes of OBDII code P1B76?

- The code P1B76 can be triggered by issues such as a weak or failing hybrid/electric vehicle battery, damaged wiring or connectors in the battery circuit, or a faulty battery management system.

3. How can I diagnose the cause of OBDII code P1B76?

- Diagnosing the cause of code P1B76 may involve using a professional OBDII scanner to read the code, inspecting the battery connections and wiring, and performing voltage tests on the battery and related components.

4. Can I continue driving my vehicle with OBDII code P1B76?

- It is not recommended to continue driving your vehicle with code P1B76 as it can lead to further damage to the hybrid/electric system. It is advised to address the issue promptly.

5. What are some repair tips for fixing OBDII code P1B76?

- Repair tips may include checking and tightening battery connections, inspecting for any visible damage to wiring, ensuring the battery is charged and in good condition, and resetting the trouble code after repairs.

6. How much does it typically cost to repair OBDII code P1B76?

- The cost of repairing OBDII code P1B76 can vary depending on the underlying issue. Costs may include labor charges for diagnosis and repair, replacement of components, and potential reprogramming of the battery management system.

7. Will resetting the trouble code make OBDII code P1B76 go away permanently?

- Resetting the trouble code may temporarily clear the code, but if the underlying issue causing P1B76 is not addressed, the code is likely to return. It is important to diagnose and fix the root cause of the problem.

8. Can extreme weather conditions affect OBDII code P1B76?

- Yes, extreme hot or cold weather conditions can potentially impact the performance of hybrid/electric vehicle batteries, which may trigger code P1B76. It is essential to monitor battery health in varying weather conditions.

9. Is it safe to attempt DIY repairs for OBDII code P1B76?

- While some basic checks and repairs like tightening connections can be done DIY, diagnosing and fixing complex issues related to hybrid/electric vehicle batteries should be left to professionals to ensure safety and proper functioning.

10. How often should I have my hybrid/electric vehicle battery system inspected to prevent OBDII code P1B76?

- It is recommended to have your hybrid/electric vehicle battery system inspected as part of regular maintenance intervals or whenever you notice symptoms of decreased performance to prevent issues like code P1B76 from occurring.