AutoCodes – Buick – P0B77 Buick

P0B77 Buick Code - Hybrid/Electric Vehicle Battery 13 Circuit

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: P0B77 Buick indicates Hybrid/Electric Vehicle Battery 13 Circuit.
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 1,025

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 P0B77 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 P0B77 Buick - Hybrid/Electric Vehicle Battery 13 Circuit - AutoCodes.com — P0B77 Buick Code - Hybrid/Electric Vehicle Battery 13 Circuit

What does this mean?

What are the Possible Causes of the DTC P0B77 Buick?

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

How to Fix the DTC P0B77 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 P0B77 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 P0B77 Buick Code

1. What are the common symptoms of OBDII code P0B77 in a Buick hybrid/electric vehicle?

Common symptoms include the check engine light coming on, reduced hybrid system performance, and potential issues with the vehicle's battery charging.

2. What can cause the OBDII code P0B77 in a Buick hybrid/electric vehicle?

This code is typically triggered by a malfunction in the Hybrid/Electric Vehicle Battery 13 Circuit, which may be caused by wiring issues, battery cell problems, or issues with the battery management system.

3. How can I diagnose the OBDII code P0B77 in my Buick hybrid/electric vehicle?

Diagnosing this code usually involves using a scan tool to read the specific fault codes, inspecting the battery connections and wiring, and testing the battery cells for proper voltage and performance.

4. Is it safe to continue driving with the OBDII code P0B77 in my Buick hybrid/electric vehicle?

It is not recommended to continue driving with this code active, as it can lead to further damage to the hybrid system and potentially cause the vehicle to stall or lose power unexpectedly.

5. Can I repair the OBDII code P0B77 in my Buick hybrid/electric vehicle myself?

While some basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing issues related to the Hybrid/Electric Vehicle Battery 13 Circuit may require specialized knowledge and equipment, so it is recommended to seek professional assistance.

6. How much does it typically cost to repair the OBDII code P0B77 in a Buick hybrid/electric vehicle?

The cost of repairing this code can vary depending on the specific cause of the issue, but it may range from a few hundred to a few thousand dollars, especially if battery components need to be replaced.

7. Are there any preventive maintenance tips to avoid triggering the OBDII code P0B77 in my Buick hybrid/electric vehicle?

Regularly inspecting the battery connections, keeping the battery charged, and following the manufacturer's recommended maintenance schedule can help prevent issues that may trigger this code.

8. Can a faulty Hybrid/Electric Vehicle Battery 13 Circuit affect the overall performance of my Buick hybrid/electric vehicle?

Yes, a malfunction in this circuit can lead to performance issues such as reduced fuel efficiency, decreased power output, and potential drivability problems in a hybrid/electric vehicle.

9. How long does it typically take to repair the OBDII code P0B77 in a Buick hybrid/electric vehicle?

The repair time can vary depending on the complexity of the issue and the availability of replacement parts, but it may take anywhere from a few hours to a few days to address the underlying cause of this fault code.

10. Can resetting the OBDII code P0B77 in my Buick hybrid/electric vehicle make the issue go away permanently?

Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the fault code is not addressed, the code is likely to reappear. It is crucial to diagnose and repair the root cause of the problem to prevent it from recurring.