AutoCodes – Generic – P1B72

P1B72 Code - Hybrid/Electric Vehicle Battery 48 Circuit Performance

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: P1B72 indicates Hybrid/Electric Vehicle Battery 48 Circuit Performance.
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 1,670

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 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B72 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 P1B72 - Hybrid/Electric Vehicle Battery 48 Circuit Performance - AutoCodes.com — P1B72 Code - Hybrid/Electric Vehicle Battery 48 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B72?

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

How to Fix the DTC P1B72?

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 P1B72 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?

Get the P1B72 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1B72 Buick — Hybrid/Electric Vehicle Battery 48 Circuit Performance
P1B72 Cadillac — Hybrid/Electric Vehicle Battery 48 Circuit Performance
P1B72 Chevrolet — Hybrid/Electric Vehicle Battery 48 Circuit Performance
P1B72 GMC — Hybrid/Electric Vehicle Battery 48 Circuit Performance
P1B72 Saturn — Hybrid/Electric Vehicle Battery 48 Circuit Performance

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 P1B72 Code

1. What are the common symptoms of OBDII code P1B72 related to Hybrid/Electric Vehicle Battery 48 Circuit Performance?

The common symptoms include reduced hybrid system performance, decreased fuel efficiency, and potential difficulty starting the vehicle.

2. What are the possible causes of OBDII code P1B72 for Hybrid/Electric Vehicle Battery 48 Circuit Performance?

Possible causes may include a faulty hybrid battery cell, issues with the battery management system, wiring or connection problems, or a malfunctioning hybrid battery control module.

3. How can I diagnose the OBDII code P1B72 for Hybrid/Electric Vehicle Battery 48 Circuit Performance?

Diagnosis typically involves using a diagnostic scan tool to read the code, checking the hybrid battery voltage levels, inspecting the wiring and connections for damage, and testing the hybrid battery cells for proper operation.

4. Can I drive my vehicle with OBDII code P1B72 present?

It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the hybrid/electric vehicle system. It is best to address the issue promptly.

5. How can I repair OBDII code P1B72 related to Hybrid/Electric Vehicle Battery 48 Circuit Performance?

Repair options may include replacing a faulty hybrid battery cell, repairing damaged wiring or connections, resetting the hybrid battery management system, or recalibrating the hybrid battery control module.

6. Are there any DIY tips for addressing OBDII code P1B72 on a Hybrid/Electric Vehicle?

While some basic checks like inspecting connections and wiring can be done by DIY enthusiasts, it is recommended to seek professional help for diagnosing and repairing complex hybrid/electric vehicle systems.

7. How much does it typically cost to repair OBDII code P1B72 for Hybrid/Electric Vehicle Battery 48 Circuit Performance?

Repair costs can vary depending on the specific issue causing the code, the labor rates of the repair shop, and the cost of any replacement parts needed. It is advisable to get a few quotes from reputable shops.

8. Can a regular mechanic repair OBDII code P1B72 on a Hybrid/Electric Vehicle?

Due to the specialized nature of hybrid/electric vehicle systems, it is recommended to seek out a mechanic or technician with experience and training in working on these types of vehicles for accurate diagnosis and repair.

9. How often does OBDII code P1B72 for Hybrid/Electric Vehicle Battery 48 Circuit Performance occur?

The occurrence of this specific code can vary depending on the vehicle's make and model, as well as the maintenance and usage history of the hybrid/electric system.

10. Is it safe to continue driving my Hybrid/Electric Vehicle if the OBDII code P1B72 does not seem to affect performance?

While the vehicle may still be operable, it is best to address any OBDII codes promptly to prevent potential damage to the hybrid/electric system in the long run.