AutoCodes – Buick – P1B76 Buick

P1B76 Buick 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 Buick 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 978

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

What does this mean?

What are the Possible Causes of the DTC P1B76 Buick?

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

How to Fix the DTC P1B76 Buick?

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 Buick 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 Buick Code

1. What does the OBDII code P1B76 mean on a Buick?

Code P1B76 indicates a low voltage issue in the Hybrid/Electric Vehicle Battery 49 Circuit, which is part of the high-voltage battery monitoring system.

2. What are the common symptoms of a P1B76 code on a Buick?

Symptoms may include an illuminated check engine light or hybrid system warning, reduced fuel efficiency, limited electric drive capability, or the vehicle entering limp mode.

3. What causes the P1B76 code on a Buick?

Possible causes include a faulty battery cell, damaged wiring in the battery circuit, a malfunctioning battery control module, or poor electrical connections.

4. How serious is the P1B76 code on a Buick?

This code is moderately serious, as it indicates an issue with the high-voltage battery. Ignoring it could lead to reduced vehicle performance or further damage to the hybrid system.

5. Can I drive my Buick with a P1B76 code?

You may be able to drive the vehicle, but it's not recommended, as the hybrid system may not function properly and could cause additional damage.

6. How do technicians diagnose the P1B76 code on a Buick?

Technicians use a scan tool to read the code and monitor battery-related data, then inspect the battery circuit wiring, connections, and the battery control module for faults.

7. What repairs are needed to fix a P1B76 code on a Buick?

Repairs may include replacing damaged wiring, repairing poor electrical connections, replacing a faulty battery cell, or reprogramming or replacing the battery control module.

8. How much does it cost to fix a P1B76 code on a Buick?

Repair costs vary depending on the issue, but they can range from $100 for minor wiring repairs to over $1,000 for battery module or cell replacement.

9. Can a weak 12V battery cause the P1B76 code on a Buick?

While the 12V battery is not directly related to this code, a weak 12V battery can lead to other electrical issues that might affect diagnostics or hybrid system performance.

10. Does the P1B76 code require high-voltage battery replacement?

Not necessarily. The issue may be resolved by repairing wiring or replacing individual components, but in severe cases, a high-voltage battery replacement might be required.