AutoCodes – GMC – P0B81 GMC

P0B81 GMC Code - Hybrid/Electric Vehicle Battery 15 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: P0B81 GMC indicates Hybrid/Electric Vehicle Battery 15 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 812

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 P0B81 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 P0B81 GMC - Hybrid/Electric Vehicle Battery 15 Circuit - AutoCodes.com — P0B81 GMC Code - Hybrid/Electric Vehicle Battery 15 Circuit

What does this mean?

What are the Possible Causes of the DTC P0B81 GMC?

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

How to Fix the DTC P0B81 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 P0B81 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 P0B81 GMC Code

1. What are the common symptoms of OBDII code P0B81 in a GMC hybrid/electric vehicle?

- Common symptoms include reduced electric vehicle range, poor gas mileage, and potential issues with the hybrid battery system.

2. What can cause the OBDII code P0B81 in a GMC hybrid/electric vehicle?

- The code P0B81 is typically triggered by a malfunction in the Hybrid/Electric Vehicle Battery 15 Circuit, which could be caused by wiring faults, battery module issues, or a faulty battery control module.

3. How can I diagnose the Hybrid/Electric Vehicle Battery 15 Circuit to resolve code P0B81 in my GMC vehicle?

- Diagnosis of the circuit involves checking the wiring harness for any damage, inspecting the battery modules for faults, and testing the battery control module for proper functioning using a diagnostic scanner.

4. Is it safe to continue driving my GMC hybrid/electric vehicle with the OBDII code P0B81 present?

- It is not recommended to drive the vehicle with code P0B81 present, as it could lead to further damage to the hybrid/electric system and potentially affect the vehicle's performance.

5. Can I repair the Hybrid/Electric Vehicle Battery 15 Circuit issue causing code P0B81 myself?

- Repairing the Hybrid/Electric Vehicle Battery 15 Circuit issue may require advanced knowledge and specialized equipment, so it is recommended to seek assistance from a qualified technician or dealership.

6. How much does it typically cost to repair the Hybrid/Electric Vehicle Battery 15 Circuit issue causing code P0B81 in a GMC vehicle?

- The cost of repair can vary depending on the extent of the issue and the specific components that need to be replaced. It is advisable to get a diagnostic assessment from a professional to determine the exact cost.

7. Will resetting the OBDII code P0B81 in my GMC vehicle make the issue go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue in the Hybrid/Electric Vehicle Battery 15 Circuit is not addressed, the code is likely to reappear.

8. Are there any preventive maintenance tips to avoid OBDII code P0B81 in a GMC hybrid/electric vehicle?

- Regularly inspecting the hybrid battery system, following manufacturer-recommended maintenance schedules, and avoiding overcharging or deep discharging the battery can help prevent issues leading to code P0B81.

9. Can a faulty sensor or fuse cause the OBDII code P0B81 in a GMC hybrid/electric vehicle?

- While a faulty sensor or fuse may contribute to issues in the hybrid/electric system, the specific nature of the code P0B81 relating to the Hybrid/Electric Vehicle Battery 15 Circuit points to problems within that circuit.

10. How long does it typically take to repair the Hybrid/Electric Vehicle Battery 15 Circuit issue causing code P0B81 in a GMC vehicle?

- The repair time can vary depending on the complexity of the issue and the availability of parts. In some cases, the repair may be completed within a few hours, while more extensive repairs could take longer.