AutoCodes – Buick – P0BBB Buick

P0BBB Buick Code - Hybrid/Electric Vehicle Battery 26 Circuit High 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: P0BBB Buick indicates Hybrid/Electric Vehicle Battery 26 Circuit High 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 942

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 P0BBB 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 P0BBB Buick - Hybrid/Electric Vehicle Battery 26 Circuit High Voltage - AutoCodes.com — P0BBB Buick Code - Hybrid/Electric Vehicle Battery 26 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0BBB Buick?

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

How to Fix the DTC P0BBB 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 P0BBB 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 P0BBB Buick Code

What does the OBDII code P0BBB mean on a Buick?

The P0BBB code indicates a problem with the high voltage in the Hybrid/Electric Vehicle Battery 26 Circuit, typically related to a specific battery module or sensor issue.

What are the common symptoms of the P0BBB code in a Buick?

Symptoms may include an illuminated check engine light, reduced fuel economy, limited hybrid system performance, or the vehicle entering limp mode.

What causes the P0BBB code to appear in a Buick?

The code can be caused by a faulty battery cell/module, wiring issues, a malfunctioning battery management system, or corrosion in the battery circuit connections.

How can I diagnose the P0BBB code on a Buick?

Diagnose the code by using an advanced OBDII scanner to check the battery voltage readings, inspecting the wiring and connectors, and performing a battery load test.

Can you drive a Buick with the P0BBB code?

It is not recommended to drive with this code for an extended period, as it can lead to further damage or reduced hybrid system performance.

How do you fix the P0BBB code on a Buick?

Repairs may include replacing the faulty battery module, repairing damaged wiring or connectors, or updating the vehicle's battery management system software.

Is the P0BBB code covered under warranty for a Buick?

The hybrid battery system may be covered under an extended warranty, so itâ€™s best to check with your dealership or warranty documentation.

Can a bad battery sensor trigger the P0BBB code in a Buick?

Yes, a malfunctioning battery voltage sensor can cause this code by providing incorrect readings to the battery management system.

How much does it cost to fix the P0BBB code on a Buick?

Repair costs can vary widely, ranging from $100 for minor wiring repairs to over $1,000 if a battery module needs replacement.

What tools are needed to troubleshoot the P0BBB code on a Buick?

Youâ€™ll need an advanced OBDII scanner capable of reading hybrid system codes, a multimeter to check voltage, and potentially manufacturer-specific diagnostic tools.