AutoCodes – Generic – P0B72

P0B72 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 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 2,060

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 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 - Hybrid/Electric Vehicle Battery 12 Circuit - AutoCodes.com — P0B72 Code - Hybrid/Electric Vehicle Battery 12 Circuit

What does this mean?

What are the Possible Causes of the DTC P0B72?

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

How to Fix the DTC P0B72?

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 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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Need Help with the Code?

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Information for Specific Makes

P0B72 Buick — Hybrid/Electric Vehicle Battery 12 Circuit
P0B72 Cadillac — Hybrid/Electric Vehicle Battery 12 Circuit
P0B72 Chevrolet — Hybrid/Electric Vehicle Battery 12 Circuit
P0B72 GMC — Hybrid/Electric Vehicle Battery 12 Circuit
P0B72 Saturn — Hybrid/Electric Vehicle Battery 12 Circuit

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 Code

1. What does OBDII code P0B72 mean?

The code P0B72 indicates a Hybrid/Electric Vehicle Battery 12 Circuit issue.

2. What are some common symptoms of OBDII code P0B72?

Common symptoms include decreased fuel efficiency, difficulty starting the vehicle, and the inability to fully charge the battery.

3. What are the possible causes of OBDII code P0B72?

Potential causes include a faulty hybrid/electric vehicle battery, issues with the 12-volt battery, damaged wiring, or a problem with the battery control module.

4. How can I diagnose OBDII code P0B72?

Diagnosing this code typically involves using a scan tool to retrieve the trouble code, inspecting the hybrid/electric battery connections, checking the 12-volt battery, and testing the battery control module.

5. Can I still drive my vehicle with OBDII code P0B72?

It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the hybrid/electric system and potentially leave you stranded.

6. How can I repair OBDII code P0B72?

Repair options may include replacing the hybrid/electric vehicle battery, fixing any damaged wiring or connections, replacing the 12-volt battery if necessary, or reprogramming the battery control module.

7. Will OBDII code P0B72 cause my vehicle to fail an emissions test?

Yes, this code can cause your vehicle to fail an emissions test, as it indicates a problem with the hybrid/electric system that can impact emissions.

8. How much does it cost to fix OBDII code P0B72?

The cost of repair can vary depending on the specific issue causing the code, but it can range from a few hundred to a few thousand dollars, especially if the hybrid/electric battery needs to be replaced.

9. Can I reset OBDII code P0B72 with a scan tool?

Resetting the code with a scan tool is possible, but it is important to diagnose and repair the underlying issue first to prevent the code from reoccurring.

10. Are there any preventive maintenance tips to avoid OBDII code P0B72?

Regularly checking the hybrid/electric vehicle battery, maintaining the 12-volt battery, and following the manufacturer's recommended service schedule can help prevent issues that trigger this trouble code.