AutoCodes – Buick – P0BBA Buick

P0BBA Buick Code - Hybrid/Electric Vehicle Battery 26 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: P0BBA Buick indicates Hybrid/Electric Vehicle Battery 26 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 840

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 P0BBA 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 P0BBA Buick - Hybrid/Electric Vehicle Battery 26 Circuit Low Voltage - AutoCodes.com — P0BBA Buick Code - Hybrid/Electric Vehicle Battery 26 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0BBA Buick?

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

How to Fix the DTC P0BBA 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 P0BBA 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 P0BBA Buick Code

What does the OBDII code P0BBA mean for my Buick?

The OBDII code P0BBA indicates that there is a low voltage issue in the Hybrid/Electric Vehicle Battery 26 circuit, which can affect the vehicle's hybrid system performance.

What symptoms might I notice if my Buick has a P0BBA code?

Common symptoms include reduced engine power, warning lights on the dashboard (such as the hybrid system warning light), and decreased fuel efficiency.

What could cause the P0BBA code to trigger in my Buick?

Possible causes include a weak or failing hybrid battery, poor electrical connections, damaged wiring, or issues with the battery management system.

How can I diagnose the problem associated with the P0BBA code?

Start by checking the hybrid battery voltage and connections, inspecting the wiring for damage, and using a scan tool to monitor the battery management system for any irregularities.

What should I do if I get a P0BBA code?

It's advisable to have the vehicle inspected by a qualified technician who can perform a thorough diagnostic and determine whether the hybrid battery needs servicing or replacement.

Can I drive my Buick safely if it has the P0BBA code?

While it may be possible to drive, it is not recommended as the vehicle may enter limp mode or exhibit reduced performance, which can affect safety.

What are some common repairs for the P0BBA code?

Repairs may include replacing the hybrid battery, repairing or replacing damaged wiring, or correcting any issues with the battery management system.

Will clearing the P0BBA code fix the problem?

Clearing the code may temporarily turn off the warning lights, but if the underlying issue is not resolved, the code is likely to return.

How can I prevent the P0BBA code from reappearing?

Regular maintenance of the hybrid battery system, ensuring clean and secure electrical connections, and addressing any warning signs early can help prevent this code from reappearing.

Is it safe to perform repairs related to the P0BBA code myself?

Due to the high voltage system in hybrid vehicles, it's recommended to have repairs handled by a professional with experience in hybrid systems to ensure safety and proper handling.