AutoCodes – GMC – P0B4B GMC

P0B4B GMC 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 GMC 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 1,244

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

What does this mean?

What are the Possible Causes of the DTC P0B4B GMC?

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

How to Fix the DTC P0B4B 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 P0B4B 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 P0B4B GMC Code

1. What are the common symptoms of OBDII code P0B4B in a GMC hybrid/electric vehicle?

- Common symptoms include reduced hybrid system performance, decreased fuel efficiency, and potential illumination of the check engine light.

2. What could cause the OBDII code P0B4B to trigger in a GMC hybrid/electric vehicle?

- The code P0B4B typically indicates an issue with Hybrid/Electric Vehicle Battery 4 Circuit Performance, which can be caused by a faulty battery cell, wiring issues, or a malfunctioning battery management system.

3. How serious is the OBDII code P0B4B in a GMC hybrid/electric vehicle?

- The code P0B4B should be addressed promptly to prevent further damage to the hybrid system and ensure optimal vehicle performance and fuel efficiency.

4. What are some basic repair tips for addressing OBDII code P0B4B in a GMC hybrid/electric vehicle?

- Basic repair tips include checking the battery connections, inspecting the wiring harness for damage, testing the battery cells, and resetting the battery management system.

5. Can OBDII code P0B4B be reset without fixing the underlying issue in a GMC hybrid/electric vehicle?

- While the code can be cleared from the system, it is crucial to address the root cause of the issue to prevent it from reoccurring and potentially causing more significant problems.

6. Is it safe to continue driving a GMC hybrid/electric vehicle with the OBDII code P0B4B present?

- It is not recommended to continue driving the vehicle with the code P0B4B present, as it can impact the vehicle's performance and fuel efficiency.

7. How can a GMC hybrid/electric vehicle owner diagnose OBDII code P0B4B at home?

- Owners can use an OBDII scanner to retrieve the code, inspect the battery connections visually, and check for any visible wiring issues before seeking professional help.

8. What are the typical repair costs associated with fixing OBDII code P0B4B in a GMC hybrid/electric vehicle?

- Repair costs can vary depending on the extent of the issue, but they may range from a few hundred to a couple of thousand dollars, including parts and labor.

9. Will fixing OBDII code P0B4B improve the fuel efficiency of a GMC hybrid/electric vehicle?

- Addressing the code P0B4B and restoring the hybrid system's performance can lead to improved fuel efficiency in the vehicle.

10. How long does it usually take to repair OBDII code P0B4B in a GMC hybrid/electric vehicle?

- The repair time can vary based on the exact cause of the issue, but it typically takes a few hours to a full day for a professional technician to diagnose and fix the problem.