AutoCodes – GMC – P1B72 GMC

P1B72 GMC 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 GMC 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 765

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 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 P1B72 GMC - Hybrid/Electric Vehicle Battery 48 Circuit Performance - AutoCodes.com — P1B72 GMC Code - Hybrid/Electric Vehicle Battery 48 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B72 GMC?

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

How to Fix the DTC P1B72 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 P1B72 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 P1B72 GMC Code

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

- Common symptoms include decreased hybrid system performance, reduced fuel efficiency, warning lights on the dashboard, and difficulty starting the vehicle.

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

- Possible causes include a faulty hybrid/electric vehicle battery, issues with the battery management system, damaged wiring or connectors in the battery circuit, or software glitches.

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

- Diagnosis typically involves using a professional diagnostic scanner to retrieve the specific fault codes, testing the hybrid/electric vehicle battery for proper voltage and capacity, and inspecting the battery circuit for any visible damage.

4. Can I drive my vehicle with OBDII code P1B72 GMC related to Hybrid/Electric Vehicle Battery 48 Circuit Performance?

- 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 unsafe driving conditions.

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

- Repair options may include replacing the hybrid/electric vehicle battery, repairing or replacing damaged wiring or connectors, updating software, or resetting the fault code after addressing the underlying issue.

6. Is it safe to reset the OBDII code P1B72 GMC for Hybrid/Electric Vehicle Battery 48 Circuit Performance without addressing the root cause?

- It is not recommended to simply reset the code without diagnosing and fixing the underlying issue, as the problem may persist and potentially lead to more severe consequences.

7. Can a DIY enthusiast repair OBDII code P1B72 GMC for Hybrid/Electric Vehicle Battery 48 Circuit Performance?

- While basic troubleshooting like checking connectors and wiring can be done by a DIY enthusiast, diagnosing and repairing complex issues related to the hybrid/electric system may require specialized knowledge and tools, so it's best to consult a professional.

8. How much does it cost to fix OBDII code P1B72 GMC for Hybrid/Electric Vehicle Battery 48 Circuit Performance?

- The cost of repair can vary significantly depending on the root cause of the issue, the extent of the damage, and the specific components that need to be replaced. It's advisable to obtain estimates from qualified technicians or service centers.

9. What preventive maintenance can help prevent OBDII code P1B72 GMC for Hybrid/Electric Vehicle Battery 48 Circuit Performance?

- Regularly inspecting the hybrid/electric vehicle battery, keeping it properly charged, and following the manufacturer's recommended maintenance schedule can help prevent issues leading to this fault code.

10. Is OBDII code P1B72 GMC for Hybrid/Electric Vehicle Battery 48 Circuit Performance a common issue in GMC hybrid/electric vehicles?

- While this code may occur in GMC hybrid/electric vehicles, it is not extremely common. However, it is essential to address it promptly to avoid potential damage to the vehicle's hybrid/electric system.