AutoCodes – Buick – P0B8C Buick

P0B8C Buick Code - Hybrid/Electric Vehicle Battery 17 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: P0B8C Buick indicates Hybrid/Electric Vehicle Battery 17 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 913

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 P0B8C 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 P0B8C Buick - Hybrid/Electric Vehicle Battery 17 Circuit Performance - AutoCodes.com — P0B8C Buick Code - Hybrid/Electric Vehicle Battery 17 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P0B8C Buick?

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

How to Fix the DTC P0B8C 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 P0B8C 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 P0B8C Buick Code

What does the OBDII code P0B8C mean on a Buick?

Code P0B8C indicates a performance issue with the Hybrid/Electric Vehicle Battery 17 Circuit, often related to voltage irregularities or communication faults in the battery system.

What are the common symptoms of code P0B8C in a Buick?

Common symptoms include dashboard warning lights (such as the check engine light or hybrid system warning), reduced fuel efficiency, limited electric power, or the vehicle entering limp mode.

What causes the P0B8C code to trigger in a Buick?

Potential causes include a faulty battery module, damaged or corroded battery wiring or connections, issues with the battery control module, or internal cell imbalance within the hybrid battery.

Can I still drive my Buick with the P0B8C code active?

Driving with this code is not recommended, as it can lead to reduced performance, potential damage to the hybrid system, or safety risks if the battery system fails.

How is the P0B8C code diagnosed in a Buick?

A technician will use a diagnostic scanner to read the code, inspect the hybrid battery and circuit connections, check for voltage discrepancies, and test the battery control module.

What is the most common repair for the P0B8C code in a Buick?

The most common repair is replacing or repairing the faulty hybrid battery module, though it may also involve fixing damaged wiring or reprogramming the battery control module.

How much does it cost to fix the P0B8C code on a Buick?

Repair costs vary widely, but replacing a hybrid battery module can range from $1,000 to $4,000, while simpler fixes like wiring repairs may cost $100 to $500.

Can a weak 12V battery trigger code P0B8C on a Buick?

While unlikely, a weak 12V battery can sometimes cause electrical anomalies in the hybrid system, so itâ€™s worth testing before pursuing more extensive repairs.

How can I prevent the P0B8C code from appearing on my Buick?

Routine maintenance, including inspecting hybrid battery connections, monitoring battery health, and addressing warning lights promptly, can help prevent this code.

Will clearing the P0B8C code fix the problem on my Buick?

Clearing the code may temporarily turn off warning lights, but it wonâ€™t resolve the underlying issue. The cause must be properly diagnosed and repaired to prevent the code from returning.