AutoCodes – Buick – P0BB5 Buick

P0BB5 Buick Code - Hybrid/Electric Vehicle Battery 25 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: P0BB5 Buick indicates Hybrid/Electric Vehicle Battery 25 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 957

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 P0BB5 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 P0BB5 Buick - Hybrid/Electric Vehicle Battery 25 Circuit Low Voltage - AutoCodes.com — P0BB5 Buick Code - Hybrid/Electric Vehicle Battery 25 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0BB5 Buick?

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

How to Fix the DTC P0BB5 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 P0BB5 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 P0BB5 Buick Code

1. What does the OBDII code P0BB5 mean for a Buick?

The P0BB5 code indicates a low voltage issue in the Hybrid/Electric Vehicle Battery 25 Circuit, which refers to a specific battery module or cell in the system.

2. What are the common symptoms of a P0BB5 code?

Symptoms may include reduced performance, decreased fuel efficiency, warning lights on the dashboard, and potential issues with the hybrid system shutting down or entering limp mode.

3. What causes the P0BB5 code to appear?

The code can be triggered by a faulty battery module, damaged wiring or connectors, a malfunctioning battery management system (BMS), or excessive wear and tear on the hybrid battery.

4. Can I continue driving my Buick with a P0BB5 code?

While you may be able to drive for a short period, itâ€™s not recommended as it could lead to further damage to the hybrid system or result in reduced performance and efficiency.

5. How is the P0BB5 code diagnosed?

Technicians use a scan tool to read the code and monitor battery module voltages, inspect wiring and connectors, and test the hybrid battery system for faults.

6. What are the repair options for a P0BB5 code?

Repairs may include replacing the faulty battery module, repairing or replacing damaged wiring or connectors, or recalibrating the battery management system.

7. How much does it cost to fix the P0BB5 code on a Buick?

The repair cost varies but can range from $500 to $4,000 or more, depending on whether the issue requires a battery module replacement or more extensive repairs.

8. Can a weak 12V battery cause the P0BB5 code?

A weak 12V battery is unlikely to directly cause this code, but it can exacerbate hybrid system issues. Check and replace the 12V battery if necessary.

9. How can I prevent the P0BB5 code from reoccurring?

Regular maintenance, monitoring hybrid battery health, and addressing electrical issues promptly can help prevent this code from returning.

10. Is the P0BB5 code covered under warranty for Buick vehicles?

In many cases, hybrid battery issues may be covered under the manufacturerâ€™s hybrid system warranty, but coverage depends on the age and mileage of the vehicle. Check with your dealership for details.