AutoCodes – Buick – P0B9B Buick

P0B9B Buick Code - Hybrid/Electric Vehicle Battery 20 Circuit Performance

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: P0B9B Buick indicates Hybrid/Electric Vehicle Battery 20 Circuit Performance.
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 1,153

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 P0B9B 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 P0B9B Buick - Hybrid/Electric Vehicle Battery 20 Circuit Performance - AutoCodes.com — P0B9B Buick Code - Hybrid/Electric Vehicle Battery 20 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P0B9B Buick?

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

How to Fix the DTC P0B9B 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 P0B9B 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 P0B9B Buick Code

1. What are common symptoms of OBDII code P0B9B in a Buick hybrid/electric vehicle?

- Common symptoms include reduced vehicle performance, lower fuel efficiency, and potential warning lights on the dashboard related to the hybrid/electric system.

2. What does the OBDII code P0B9B for Hybrid/Electric Vehicle Battery 20 Circuit Performance indicate in a Buick?

- This code indicates a potential issue with the performance of the 20th circuit in the hybrid/electric vehicle battery system.

3. What are possible causes of the P0B9B code in a Buick hybrid/electric vehicle?

- Possible causes include a faulty battery cell in the 20th circuit, wiring issues, poor electrical connections, or a malfunctioning battery management system.

4. How can I diagnose the P0B9B code in my Buick hybrid/electric vehicle?

- Diagnosis typically involves using a diagnostic scanner to read the code, testing the 20th circuit for voltage irregularities, inspecting wiring and connections, and checking the battery health.

5. Can I drive my Buick with the P0B9B code present?

- It is not recommended to drive the vehicle with the P0B9B code present, as it can lead to further damage to the hybrid/electric system and potentially affect overall vehicle performance.

6. What are some repair tips for addressing the P0B9B code in a Buick hybrid/electric vehicle?

- Repair tips include checking and repairing any damaged wiring, replacing the faulty battery cell if necessary, ensuring proper electrical connections, and resetting the trouble code after repairs are made.

7. Is it safe to attempt repairs for the P0B9B code on my own?

- Due to the complexity of hybrid/electric vehicle systems, it is recommended to seek assistance from a qualified technician or dealership to properly diagnose and repair the issue related to the P0B9B code.

8. How much does it typically cost to repair the P0B9B code in a Buick hybrid/electric vehicle?

- Repair costs can vary depending on the specific issue causing the code, but it is advisable to budget for potential battery cell replacement or wiring repairs, which can range from a few hundred to a few thousand dollars.

9. Can the P0B9B code be a recurring issue in a Buick hybrid/electric vehicle?

- If the underlying cause of the code is not properly addressed, it can potentially recur. Regular maintenance and monitoring of the hybrid/electric system can help prevent future occurrences of the P0B9B code.

10. Will resetting the OBDII code P0B9B in my Buick clear the issue permanently?

- Simply resetting the code may temporarily clear the warning light, but it will not fix the underlying problem causing the P0B9B code. It is important to diagnose and address the root cause of the issue for a permanent solution.