AutoCodes – GMC – P0B4C GMC

P0B4C GMC 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 GMC 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 1,000

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

What does this mean?

What are the Possible Causes of the DTC P0B4C GMC?

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

How to Fix the DTC P0B4C GMC?

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 GMC 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 GMC Code

1. What does the OBDII code P0B4C mean on a GMC vehicle?

The P0B4C code indicates that the Hybrid/Electric Vehicle Battery 4 circuit is experiencing low voltage, often linked to issues in one of the battery modules or its associated circuitry.

2. What are common symptoms of the P0B4C code?

Common symptoms include reduced hybrid system performance, a check engine light or hybrid system warning, poor fuel efficiency, and limited electric motor assistance.

3. What causes the P0B4C code to appear?

This code can be caused by a faulty battery module, damaged wiring or connectors in the battery circuit, a malfunctioning battery management system, or internal resistance issues within the battery pack.

4. Can I drive my GMC with a P0B4C code?

Itâ€™s not recommended to drive with this code active for long periods, as it may lead to reduced performance, further damage to the hybrid battery system, or the vehicle entering a limp mode.

5. How is the P0B4C code diagnosed?

A technician will use a scan tool to access the battery control module data, inspect wiring and connectors, test individual battery cells or modules for voltage irregularities, and verify the integrity of the battery management system.

6. Can a weak 12V battery cause the P0B4C code?

While a weak 12V battery can cause other electrical issues, the P0B4C code specifically refers to the high-voltage hybrid battery system and is not directly related to the 12V battery.

7. How much does it cost to repair the P0B4C code?

Repair costs vary depending on the issue. Replacing a battery module can cost several hundred dollars, while replacing the entire hybrid battery pack may cost several thousand dollars.

8. Can resetting the code fix the P0B4C issue?

Resetting the code without addressing the underlying problem is not a solution; the code will likely return if the low voltage issue persists.

9. What tools are needed to troubleshoot the P0B4C code?

Diagnostics require a professional-grade scan tool capable of reading hybrid system data, a multimeter for voltage testing, and possibly specialized tools to safely handle high-voltage components.

10. What maintenance can prevent the P0B4C code?

Regular inspections of the hybrid battery system, ensuring connectors and wiring are in good condition, and addressing any battery performance issues promptly can help prevent this code.