AutoCodes – Generic – P0B4B

P0B4B Code - Hybrid/Electric Vehicle Battery 4 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: P0B4B indicates Hybrid/Electric Vehicle Battery 4 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 1,788

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 P0B4B 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 P0B4B - Hybrid/Electric Vehicle Battery 4 Circuit Performance - AutoCodes.com — P0B4B Code - Hybrid/Electric Vehicle Battery 4 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P0B4B?

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

How to Fix the DTC P0B4B?

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 P0B4B 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 P0B4B code?

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Need Help with the Code?

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Information for Specific Makes

P0B4B Buick — Hybrid/Electric Vehicle Battery 4 Circuit Performance
P0B4B Cadillac — Hybrid/Electric Vehicle Battery 4 Circuit Performance
P0B4B Chevrolet — Hybrid/Electric Vehicle Battery 4 Circuit Performance
P0B4B GMC — Hybrid/Electric Vehicle Battery 4 Circuit Performance
P0B4B Saturn — Hybrid/Electric Vehicle Battery 4 Circuit Performance

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 P0B4B Code

1. What are common symptoms of OBDII code P0B4B (Hybrid/Electric Vehicle Battery 4 Circuit Performance)?

- Common symptoms include reduced electric vehicle range, poor battery performance, and potential warning lights on the dashboard.

2. What are some possible causes of OBDII code P0B4B?

- Causes may include issues with the hybrid/electric vehicle battery 4 circuit, battery degradation, faulty battery cells, or problems with the battery management system.

3. How can I diagnose the source of OBDII code P0B4B?

- Diagnosing the code typically involves using a scan tool to retrieve specific battery-related data, checking the battery connections, inspecting the battery cells, and testing the battery management system.

4. Can OBDII code P0B4B be fixed without professional help?

- While some basic troubleshooting like checking battery connections can be done by DIY enthusiasts, diagnosing and repairing complex battery issues usually requires professional expertise due to the high voltage nature of hybrid/electric vehicle systems.

5. What are the potential risks of ignoring OBDII code P0B4B?

- Ignoring the code can lead to further damage to the battery system, reduced vehicle performance, and potential safety hazards due to compromised battery integrity.

6. Are there any common repair tips for addressing OBDII code P0B4B?

- Repair tips may include checking and tightening battery connections, replacing faulty battery cells, recalibrating the battery management system, or seeking professional assistance for advanced diagnostics and repairs.

7. How much does it typically cost to fix OBDII code P0B4B?

- The cost of fixing this code can vary significantly depending on the underlying issue, parts needed for repair, labor costs, and whether the repair is done by a dealership or an independent mechanic.

8. Can OBDII code P0B4B affect the overall performance of a hybrid or electric vehicle?

- Yes, this code can significantly impact the performance of the vehicle, especially its electric driving range, battery efficiency, and overall power delivery.

9. Is it safe to continue driving with OBDII code P0B4B present?

- It is not recommended to continue driving with this code active, as it can lead to further damage to the hybrid/electric vehicle battery system and compromise the safety and performance of the vehicle.

10. How often should the hybrid/electric vehicle battery system be inspected to prevent OBDII code P0B4B from occurring?

- Regular inspections and maintenance of the battery system, following the manufacturer's recommended schedule, can help prevent issues like OBDII code P0B4B from occurring.