AutoCodes – Buick – P0BB9 Buick

P0BB9 Buick Code - Hybrid/Electric Vehicle Battery 26 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: P0BB9 Buick indicates Hybrid/Electric Vehicle Battery 26 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 845

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 P0BB9 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 P0BB9 Buick - Hybrid/Electric Vehicle Battery 26 Circuit Performance - AutoCodes.com — P0BB9 Buick Code - Hybrid/Electric Vehicle Battery 26 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P0BB9 Buick?

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

How to Fix the DTC P0BB9 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 P0BB9 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 P0BB9 Buick Code

1. What are the common symptoms of OBDII code P0BB9 in a Buick Hybrid/Electric Vehicle?

- Common symptoms include reduced fuel efficiency, loss of power, and the vehicle may not start or move at all.

2. What can cause the OBDII code P0BB9 to trigger in a Buick Hybrid/Electric Vehicle?

- The code P0BB9 typically triggers due to issues with the Hybrid/Electric Vehicle Battery 26 Circuit, such as damaged wiring, a faulty battery pack, or a malfunctioning control module.

3. How can I diagnose the OBDII code P0BB9 in my Buick Hybrid/Electric Vehicle?

- Diagnosis involves using a scan tool to retrieve the specific code, inspecting the battery and circuit connections for damage, and performing voltage tests to identify the source of the issue.

4. Can I continue driving my Buick Hybrid/Electric Vehicle with the OBDII code P0BB9 present?

- It is not recommended to continue driving with the code present, as it can lead to further damage to the hybrid system and potentially leave you stranded.

5. What are some repair tips for fixing the OBDII code P0BB9 in a Buick Hybrid/Electric Vehicle?

- Repair tips include checking and repairing any damaged wiring, replacing the faulty battery pack if necessary, and resetting the fault codes after repairs are completed.

6. How much does it typically cost to repair the OBDII code P0BB9 in a Buick Hybrid/Electric Vehicle?

- The cost of repair can vary depending on the extent of the damage and the parts needed, but it can range from a few hundred to a few thousand dollars.

7. Are there any safety concerns associated with the OBDII code P0BB9 in a Buick Hybrid/Electric Vehicle?

- Yes, there can be safety concerns, as the code indicates a problem with the high-voltage hybrid system, which can be dangerous if not addressed promptly.

8. Can I reset the OBDII code P0BB9 in my Buick Hybrid/Electric Vehicle by disconnecting the battery?

- While disconnecting the battery may temporarily clear the code, it is not a recommended repair method as the underlying issue causing the code will still need to be addressed.

9. How long does it typically take to repair the OBDII code P0BB9 in a Buick Hybrid/Electric Vehicle?

- The repair time can vary depending on the complexity of the issue, but it may take a few hours to a full day to diagnose and fix the problem.

10. Is it possible to prevent the OBDII code P0BB9 from recurring in my Buick Hybrid/Electric Vehicle?

- Regular maintenance checks, keeping the hybrid system components clean and well-maintained, and addressing any issues promptly can help prevent the code from recurring.