AutoCodes – GMC – P0B72 GMC

P0B72 GMC Code - Hybrid/Electric Vehicle Battery 12 Circuit

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: P0B72 GMC indicates Hybrid/Electric Vehicle Battery 12 Circuit.
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 805

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B72 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 P0B72 GMC - Hybrid/Electric Vehicle Battery 12 Circuit - AutoCodes.com — P0B72 GMC Code - Hybrid/Electric Vehicle Battery 12 Circuit

What does this mean?

What are the Possible Causes of the DTC P0B72 GMC?

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

How to Fix the DTC P0B72 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 P0B72 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 P0B72 GMC Code

What does the OBDII code P0B72 mean for a GMC vehicle?

Code P0B72 indicates an issue with the Hybrid/Electric Vehicle Battery 12 Circuit, which monitors the voltage and functionality of the battery pack's specific segment.

What are the common symptoms of the P0B72 code in GMC vehicles?

Symptoms may include reduced fuel efficiency, limited hybrid or EV functionality, warning lights on the dashboard, and a possible loss of propulsion power.

What causes the P0B72 code to appear in GMC vehicles?

Typical causes include a faulty battery cell, damaged wiring or connectors in the battery circuit, issues with the battery control module, or corrosion within the battery pack.

Can the P0B72 code affect the performance of a GMC hybrid or electric vehicle?

Yes, this code can lead to reduced performance, limited electric power availability, and activation of fail-safe modes to protect the vehicleâ€™s battery system.

How is the P0B72 code diagnosed in GMC vehicles?

Technicians use an OBDII scanner to retrieve the code, inspect the battery circuit wiring, check for voltage irregularities, and test the operation of the battery control module.

Can I drive my GMC vehicle with the P0B72 code?

Driving may still be possible, but it is not recommended as it could lead to further damage or cause the vehicle to enter a reduced power mode unexpectedly.

How do you repair the P0B72 code in a GMC vehicle?

Repairs typically involve replacing damaged wiring or connectors, repairing or replacing faulty battery cells, or recalibrating or replacing the battery control module.

Is the P0B72 code covered under GMC warranty?

Depending on your vehicle's warranty and the age of the battery pack, repairs related to the hybrid or electric battery system may be covered under the manufacturerâ€™s warranty.

How much does it cost to fix the P0B72 code in GMC vehicles?

Costs can vary widely depending on the issue but may range from $200 for minor wiring fixes to over $1,000 for battery cell or module replacement.

Can a P0B72 code be cleared without repairing the issue?

Clearing the code without addressing the underlying issue may temporarily eliminate the warning, but the problem will likely return and could worsen over time.