AutoCodes – Buick – P0BB4 Buick

P0BB4 Buick Code - Hybrid/Electric Vehicle Battery 25 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: P0BB4 Buick indicates Hybrid/Electric Vehicle Battery 25 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 930

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 P0BB4 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 P0BB4 Buick - Hybrid/Electric Vehicle Battery 25 Circuit Performance - AutoCodes.com — P0BB4 Buick Code - Hybrid/Electric Vehicle Battery 25 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P0BB4 Buick?

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

How to Fix the DTC P0BB4 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 P0BB4 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 P0BB4 Buick Code

1. What does the OBDII code P0BB4 mean on a Buick?

P0BB4 indicates an issue with the performance of the Hybrid/Electric Vehicle Battery 25 Circuit, often related to voltage or communication irregularities.

2. What are the common symptoms of code P0BB4 on a Buick?

Symptoms may include reduced fuel efficiency, the hybrid/electric system warning light, loss of hybrid functionality, or erratic vehicle performance.

3. What causes the P0BB4 code to appear?

Common causes include a faulty battery module, damaged wiring or connectors in the battery circuit, or a failing battery control module.

4. Can I continue driving my Buick with a P0BB4 code?

Itâ€™s not recommended, as the issue could worsen, potentially causing further damage to the hybrid system or reducing vehicle performance.

5. How is the P0BB4 code diagnosed?

A mechanic will use a scan tool to retrieve the code, inspect battery module 25 voltage readings, and check for damaged wiring or poor connections in the circuit.

6. How do you repair a P0BB4 code on a Buick?

Repairs may involve replacing the faulty battery module, repairing or replacing damaged wiring, or reprogramming the battery control module if necessary.

7. Is the P0BB4 code specific to one battery module?

Yes, it specifically refers to battery module 25, indicating performance issues isolated to that part of the hybrid battery system.

8. What tools are needed to fix the P0BB4 code?

A diagnostic scanner, multimeter for electrical testing, and potentially specialized tools for hybrid battery servicing are required.

9. How much does it cost to fix the P0BB4 code?

Repair costs vary but could range from $200 to $1,000 or more, depending on whether wiring repairs, module replacement, or reprogramming is needed.

10. Can a weak 12-volt battery trigger the P0BB4 code?

While unlikely, a weak 12-volt battery can sometimes cause electrical irregularities that contribute to hybrid system codes, so itâ€™s worth testing as part of the diagnosis.