AutoCodes – Buick – P0B81 Buick

P0B81 Buick 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 Buick 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 808

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

What does this mean?

What are the Possible Causes of the DTC P0B81 Buick?

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

How to Fix the DTC P0B81 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 P0B81 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.

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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 Buick Code

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

- Common symptoms include reduced hybrid system performance, poor fuel efficiency, and potential difficulty starting the vehicle.

2. What typically causes OBDII code P0B81 in a Buick hybrid/electric vehicle?

- This code is usually triggered by a fault in the Hybrid/Electric Vehicle Battery 15 Circuit, such as a damaged battery cell or faulty wiring.

3. How can I diagnose the Hybrid/Electric Vehicle Battery 15 Circuit issue causing OBDII code P0B81 in my Buick?

- A thorough diagnostic scan using an OBDII scanner and inspection of the battery connections and wiring can help pinpoint the exact cause of the problem.

4. Is it safe to continue driving my Buick with OBDII code P0B81 present?

- It is not recommended to drive the vehicle with this code active, as it can lead to further damage to the hybrid/electric system and potentially compromise vehicle safety.

5. Can I repair OBDII code P0B81 in my Buick hybrid/electric vehicle myself?

- While basic troubleshooting like checking connections and fuses can be done by a DIY enthusiast, complex repairs involving the battery system should be handled by a professional technician.

6. How much does it typically cost to repair OBDII code P0B81 related to the Hybrid/Electric Vehicle Battery 15 Circuit in a Buick?

- Repair costs can vary depending on the extent of the damage, but expect to pay anywhere from a few hundred to a couple of thousand dollars for parts and labor.

7. Are there any preventive maintenance tips to avoid triggering OBDII code P0B81 in my Buick hybrid/electric vehicle?

- Regularly inspecting the battery system, keeping it properly charged, and following the manufacturer's maintenance schedule can help prevent issues that lead to this code.

8. Can a faulty sensor or module also trigger OBDII code P0B81 in a Buick hybrid/electric vehicle?

- While less common, a faulty sensor or module related to the Hybrid/Electric Vehicle Battery 15 Circuit can also trigger this OBDII code and should be checked during diagnostics.

9. How long does it typically take to repair OBDII code P0B81 in a Buick hybrid/electric vehicle?

- The repair time can vary based on the exact cause of the issue, but it usually takes a few hours to a day for a professional technician to diagnose and fix the problem.

10. Will resetting the OBDII system clear OBDII code P0B81 in my Buick?

- Resetting the OBDII system may temporarily clear the code, but it will likely reappear if the underlying issue with the Hybrid/Electric Vehicle Battery 15 Circuit is not addressed.