AutoCodes – Buick – P0B4A Buick

P0B4A Buick Code - Hybrid/Electric Vehicle Battery 4 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: P0B4A Buick indicates Hybrid/Electric Vehicle Battery 4 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 954

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0B4A 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 P0B4A Buick - Hybrid/Electric Vehicle Battery 4 Circuit - AutoCodes.com — P0B4A Buick Code - Hybrid/Electric Vehicle Battery 4 Circuit

What does this mean?

What are the Possible Causes of the DTC P0B4A Buick?

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

How to Fix the DTC P0B4A 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 P0B4A 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.

Need more information about the P0B4A Buick code?

Need more information on how to fix the P0B4A Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0B4A Buick code diagnosed by a professional: Find a repair shop in your area

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 P0B4A Buick Code

1. What are common symptoms of OBDII code P0B4A in a Buick hybrid/electric vehicle?

- Common symptoms include reduced fuel efficiency, the vehicle not starting, and the hybrid system not engaging properly.

2. What can cause the OBDII code P0B4A in a Buick hybrid/electric vehicle?

- This code is typically triggered by a malfunction in the Hybrid/Electric Vehicle Battery 4 Circuit, which could be due to a wiring issue, battery pack problem, or sensor failure.

3. How serious is the OBDII code P0B4A in a Buick hybrid/electric vehicle?

- This code should be addressed promptly as it can impact the performance and reliability of the hybrid system, potentially leading to drivability issues.

4. What are some DIY repair tips for OBDII code P0B4A in a Buick hybrid/electric vehicle?

- DIY repair options may include checking and repairing any damaged wiring, ensuring proper battery connections, and inspecting related sensors for faults.

5. Can driving with the OBDII code P0B4A in a Buick hybrid/electric vehicle cause further damage?

- Continuing to drive with this code present may exacerbate the issue and potentially lead to more severe problems with the hybrid system over time.

6. How much does it cost to repair OBDII code P0B4A in a Buick hybrid/electric vehicle?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve replacing components, rewiring, or recalibrating the hybrid system, which can range from a few hundred to over a thousand dollars.

7. Can resetting the OBDII code P0B4A in a Buick hybrid/electric vehicle fix the problem?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the fault code to appear.

8. Is it safe to drive a Buick hybrid/electric vehicle with the OBDII code P0B4A if the symptoms are not severe?

- It is not recommended to drive the vehicle with this code present, as it can lead to unpredictable behavior and potential safety hazards while on the road.

9. How long does it typically take to repair OBDII code P0B4A in a Buick hybrid/electric vehicle?

- The repair time can vary depending on the complexity of the issue and the availability of parts, but it may take a few hours to a day for a mechanic to diagnose and fix the problem.

10. Can a regular mechanic diagnose and repair OBDII code P0B4A in a Buick hybrid/electric vehicle, or is a specialized technician required?

- While some general mechanics may have experience with hybrid/electric vehicles, it is recommended to seek out a specialized technician or a dealership familiar with hybrid systems to ensure accurate diagnosis and repair of this code.