AutoCodes – Buick – P0B72 Buick

P0B72 Buick 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 Buick 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 941

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC P0B72 Buick?

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

How to Fix the DTC P0B72 Buick?

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 Buick 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.

Need more information about the P0B72 Buick code?

Need more information on how to fix the P0B72 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0B72 Buick code diagnosed by a professional: Find a repair shop in your area

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 Buick Code

1. What does the OBDII code P0B72 mean for a Buick?

The P0B72 code indicates an issue with the Hybrid/Electric Vehicle Battery 12 Circuit, suggesting a problem with voltage levels or communication in this specific battery module.

2. What are the symptoms of code P0B72 in a Buick?

Symptoms may include reduced hybrid system performance, warning lights on the dashboard, poor fuel economy, or difficulty starting the vehicle.

3. What causes the P0B72 code to appear?

Common causes include a faulty battery module, damaged wiring or connectors, a malfunctioning hybrid battery control module, or low voltage in the affected circuit.

4. Can I still drive my Buick with the P0B72 code?

While the vehicle may still be drivable, operating it with this code can lead to further damage or reduced performance. Itâ€™s best to address the issue promptly.

5. How is the P0B72 code diagnosed?

A mechanic will use a scan tool to confirm the code, inspect the battery module and wiring for damage, and test the voltage levels in the affected circuit.

6. What repairs are needed to fix code P0B72?

Repairs might include replacing the faulty battery module, repairing or replacing damaged wiring, or updating/replacing the hybrid battery control module.

7. How much does it cost to fix the P0B72 code on a Buick?

Repair costs can vary widely depending on the exact issue but typically range from $200 to over $1,000, especially if battery module replacement is required.

8. Can a weak 12V battery cause the P0B72 code?

Yes, a weak or failing 12V battery can sometimes trigger this code, as it may affect the hybrid systemâ€™s circuits.

9. What tools are needed to troubleshoot the P0B72 code?

Youâ€™ll need an advanced OBDII scanner capable of reading hybrid system codes, a multimeter for voltage checks, and potentially manufacturer-specific diagnostic tools.

10. Can the P0B72 code clear itself?

The code may temporarily clear itself if the issue is intermittent, but itâ€™s likely to reappear unless the underlying problem is resolved.