AutoCodes – GMC – P0B48 GMC

P0B48 GMC Code - Hybrid/Electric Vehicle Battery 3 Circuit High 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: P0B48 GMC indicates Hybrid/Electric Vehicle Battery 3 Circuit High 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 932

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 P0B48 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 P0B48 GMC - Hybrid/Electric Vehicle Battery 3 Circuit High Voltage - AutoCodes.com — P0B48 GMC Code - Hybrid/Electric Vehicle Battery 3 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0B48 GMC?

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

How to Fix the DTC P0B48 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 P0B48 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 P0B48 GMC Code

1. What are the common symptoms of OBDII code P0B48 in a GMC Hybrid/Electric Vehicle?

- Common symptoms include reduced hybrid system performance, illuminated warning lights on the dashboard, and potential issues with the vehicle's battery charging.

2. What can cause the OBDII code P0B48 to trigger in a GMC Hybrid/Electric Vehicle?

- This code is typically triggered by a high voltage condition in the Hybrid/Electric Vehicle Battery 3 circuit, which may be caused by a faulty battery cell, damaged wiring, or a malfunctioning battery management system.

3. How can I diagnose the underlying issue causing OBDII code P0B48 in my GMC Hybrid/Electric Vehicle?

- Diagnosis involves using a diagnostic scanner to retrieve the specific trouble code, inspecting the high voltage battery components for any visible damage, and performing electrical tests to pinpoint the exact cause of the high voltage condition.

4. Can I continue driving my GMC Hybrid/Electric Vehicle with OBDII code P0B48 present?

- It is not recommended to continue driving the vehicle with this code present, as it may lead to further damage to the hybrid system components and potentially unsafe driving conditions.

5. What are some repair tips for resolving OBDII code P0B48 in a GMC Hybrid/Electric Vehicle?

- Repair tips may include replacing the faulty battery cell, repairing damaged wiring, recalibrating the battery management system, or seeking assistance from a certified hybrid technician for a thorough diagnosis and repair.

6. Is it safe to attempt repairing OBDII code P0B48 in a GMC Hybrid/Electric Vehicle without professional help?

- Due to the high voltage nature of the hybrid system, it is recommended to seek professional help from a certified hybrid technician to safely diagnose and repair the underlying issue causing the code.

7. How much does it typically cost to repair OBDII code P0B48 in a GMC Hybrid/Electric Vehicle?

- Repair costs can vary depending on the specific cause of the code, but it may involve expenses for parts replacement, diagnostic services, and labor fees, which can range from a few hundred to over a thousand dollars.

8. Can a DIY enthusiast with automotive experience fix OBDII code P0B48 in a GMC Hybrid/Electric Vehicle?

- While some experienced DIY enthusiasts may have the skills to diagnose and repair simple electrical issues, dealing with high voltage systems in hybrid vehicles requires specialized knowledge and equipment best handled by certified professionals.

9. How long does it typically take to repair OBDII code P0B48 in a GMC Hybrid/Electric Vehicle?

- The repair time can vary depending on the complexity of the issue, availability of parts, and the technician's workload, but it may take several hours to a few days to diagnose and resolve the high voltage circuit problem.

10. Are there any preventative maintenance measures to avoid OBDII code P0B48 in a GMC Hybrid/Electric Vehicle?

- Regularly scheduled maintenance, such as checking the hybrid system components for signs of wear, monitoring battery health, and following manufacturer recommendations, can help prevent issues that may trigger the OBDII code P0B48.