AutoCodes – Buick – P0B4F Buick

P0B4F Buick Code - Hybrid/Electric Vehicle Battery 5 Circuit

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: P0B4F Buick indicates Hybrid/Electric Vehicle Battery 5 Circuit.
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 768

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 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B4F 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 P0B4F Buick - Hybrid/Electric Vehicle Battery 5 Circuit - AutoCodes.com — P0B4F Buick Code - Hybrid/Electric Vehicle Battery 5 Circuit

What does this mean?

What are the Possible Causes of the DTC P0B4F Buick?

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

How to Fix the DTC P0B4F 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 P0B4F 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 P0B4F Buick Code

1. What are the common symptoms of OBDII code P0B4F in a Buick Hybrid/Electric Vehicle?

- Common symptoms include a decrease in fuel efficiency, reduced power output, and the illumination of the check engine light.

2. What does the OBDII code P0B4F indicate in a Buick Hybrid/Electric Vehicle?

- This code specifically refers to an issue with Hybrid/Electric Vehicle Battery 5 Circuit.

3. What are the possible causes of OBDII code P0B4F in a Buick Hybrid/Electric Vehicle?

- Possible causes include a faulty battery pack, damaged wiring, poor connection, or issues with the battery management system.

4. How can I diagnose the OBDII code P0B4F in my Buick Hybrid/Electric Vehicle?

- Diagnosis typically involves using a scan tool to read the code and then performing further testing to pinpoint the exact cause, such as checking the battery voltage and inspecting the wiring.

5. Is it safe to continue driving with OBDII code P0B4F present in a Buick Hybrid/Electric Vehicle?

- It is not recommended to drive with this code present, as it can lead to further damage to the vehicle's electrical system and potentially cause safety hazards.

6. What are some repair tips for addressing OBDII code P0B4F in a Buick Hybrid/Electric Vehicle?

- Repair tips may include checking and repairing any damaged wiring, ensuring proper connections, and replacing the battery pack if necessary.

7. Can I reset the OBDII code P0B4F in my Buick Hybrid/Electric Vehicle myself?

- While you can clear the code using a scan tool, it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. How much does it typically cost to repair OBDII code P0B4F in a Buick Hybrid/Electric Vehicle?

- Repair costs can vary depending on the exact cause of the issue, but they may involve the cost of replacement parts, labor, and diagnostic fees.

9. Are there any preventive measures I can take to avoid OBDII code P0B4F in my Buick Hybrid/Electric Vehicle?

- Regular maintenance, such as checking the battery's condition and ensuring proper wiring connections, can help prevent issues that may trigger this code.

10. Can OBDII code P0B4F in a Buick Hybrid/Electric Vehicle be caused by environmental factors?

- While rare, extreme temperatures or exposure to water can potentially contribute to issues with the Hybrid/Electric Vehicle Battery 5 Circuit, leading to the code P0B4F.