AutoCodes – Cadillac – P0B72 Cadillac

P0B72 Cadillac 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 Cadillac 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 892

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

What does this mean?

What are the Possible Causes of the DTC P0B72 Cadillac?

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

How to Fix the DTC P0B72 Cadillac?

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 Cadillac 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 Cadillac Code

1. What does the OBDII code P0B72 mean on a Cadillac?

P0B72 indicates an issue with the Hybrid/Electric Vehicle Battery 12 Circuit, which monitors the voltage and performance of the 12th cell in the high-voltage battery.

2. What are common symptoms of code P0B72 in a Cadillac?

Symptoms may include reduced fuel efficiency, limited hybrid or electric mode functionality, a check engine light, or a warning message on the dashboard.

3. What causes the P0B72 code to appear?

Possible causes include a faulty battery cell, damaged wiring or connectors in the circuit, a malfunctioning battery management system, or corrosion in the electrical connections.

4. Can I drive my Cadillac with a P0B72 code?

While driving may still be possible, it is not recommended as the issue could worsen, potentially leading to further damage to the hybrid/electric battery system.

5. How can I diagnose the P0B72 code?

Start by using a scan tool to confirm the code, visually inspect the wiring and connectors for damage or corrosion, and test the voltage of the 12th battery cell to check for abnormalities.

6. What repairs are needed to fix the P0B72 code?

Repairs may include replacing the faulty battery cell, repairing or replacing damaged wiring, cleaning corroded connectors, or recalibrating the battery management system.

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

Repair costs can vary widely, ranging from $100 for minor wiring repairs to over $1,000 if a battery cell replacement or extensive diagnostics are required.

8. Can a P0B72 code be caused by environmental factors?

Yes, extreme temperature conditions can affect battery performance and connections, potentially triggering the P0B72 code.

9. Does resetting the code fix the issue?

Resetting the code may clear the warning temporarily, but if the underlying issue is not addressed, the code will likely return.

10. Do I need to replace the entire hybrid battery for a P0B72 code?

Not necessarily. If only one cell is faulty, it may be possible to replace just that cell rather than the entire battery pack, depending on the severity of the issue.