AutoCodes – Buick – P0B4C Buick

P0B4C Buick Code - Hybrid/Electric Vehicle Battery 4 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: P0B4C Buick indicates Hybrid/Electric Vehicle Battery 4 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 860

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 P0B4C 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 P0B4C Buick - Hybrid/Electric Vehicle Battery 4 Circuit Low Voltage - AutoCodes.com — P0B4C Buick Code - Hybrid/Electric Vehicle Battery 4 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0B4C Buick?

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

How to Fix the DTC P0B4C 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 P0B4C 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 P0B4C Buick Code

What does the OBDII code P0B4C mean for a Buick?

1. P0B4C indicates a "Hybrid/Electric Vehicle Battery 4 Circuit Low Voltage," meaning the voltage in battery module 4 is lower than expected. 2.

What are the common symptoms of code P0B4C in a Buick?

Symptoms may include a check engine light, reduced hybrid system performance, poor fuel efficiency, or the vehicle entering limp mode. 3.

What causes the P0B4C code to appear in a Buick?

Common causes include a faulty battery module, damaged wiring or connectors, a malfunctioning battery management system, or internal battery degradation. 4.

Can I drive my Buick with the P0B4C code?

While the vehicle may still function, driving with this code can lead to reduced performance and potentially cause further damage to the hybrid battery system. 5.

How is the P0B4C code diagnosed in a Buick?

Technicians use a scan tool to check the hybrid battery system, inspect voltage readings for module 4, and visually examine wiring, connectors, and the battery pack itself. 6.

What repairs are needed to fix the P0B4C code in a Buick?

Repairs may include replacing the faulty battery module, repairing damaged wiring or connectors, or recalibrating/reprogramming the battery management system. 7.

How much does it cost to fix the P0B4C code on a Buick?

Repair costs vary widely but can range from $300 to over $2,000, depending on whether only wiring repairs are needed or if the hybrid battery module requires replacement. 8.

Can a low 12V battery cause the P0B4C code on a Buick?

No, this code specifically relates to the hybrid battery system, not the 12V auxiliary battery. 9.

Can resetting the code fix the P0B4C issue in a Buick?

Resetting the code may temporarily clear the check engine light, but the underlying problem with the hybrid battery system must be addressed to prevent recurrence. 10.

How can I prevent the P0B4C code from happening again on my Buick?

Regular maintenance of the hybrid system, ensuring proper cooling of the battery, and promptly addressing any warning signs can help prevent this issue.