AutoCodes – Buick – P0B7A Buick

P0B7A Buick Code - Hybrid/Electric Vehicle Battery 13 Circuit High Voltage

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: P0B7A Buick indicates Hybrid/Electric Vehicle Battery 13 Circuit High Voltage.
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 776

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 P0B7A 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 P0B7A Buick - Hybrid/Electric Vehicle Battery 13 Circuit High Voltage - AutoCodes.com — P0B7A Buick Code - Hybrid/Electric Vehicle Battery 13 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0B7A Buick?

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

How to Fix the DTC P0B7A 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 P0B7A 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 P0B7A Buick Code

What does the OBDII code P0B7A mean for a Buick?

The code P0B7A indicates a high voltage issue in the circuit associated with the hybrid or electric vehicle battery module 13.

What are the common symptoms of code P0B7A in a Buick?

Symptoms may include reduced vehicle performance, warning lights on the dashboard, decreased fuel efficiency, and limited hybrid or electric functionality.

What causes the P0B7A code to appear in a Buick?

Common causes include a faulty battery module, damaged wiring or connectors, issues with the voltage sensor, or problems with the hybrid control module.

Can I drive my Buick with the P0B7A code?

Itâ€™s not recommended to drive for extended periods, as this code may affect the battery's performance, potentially leading to further damage or reduced efficiency.

How is the P0B7A code typically diagnosed?

Technicians use a scan tool to retrieve the code and perform tests on the affected battery module, wiring, connectors, and related sensors.

What repairs are commonly needed for the P0B7A code in a Buick?

Repairs may involve replacing the faulty battery module, repairing or replacing damaged wiring, or recalibrating the hybrid control module.

Is the P0B7A code exclusive to Buick vehicles?

No, this code can occur in other hybrid or electric vehicles but is specific to the battery module 13 circuit.

How much does it cost to fix the P0B7A code in a Buick?

Repair costs vary depending on the exact issue but may range from $500 to $2,500, particularly if the battery module needs replacement.

Can I fix the P0B7A code myself?

Unless you have expertise with hybrid or electric systems, this repair is best left to professionals to avoid further damage or safety risks.

What preventive maintenance can help avoid the P0B7A code?

Regular inspections of the hybrid battery system, ensuring wiring integrity, and following the manufacturerâ€™s maintenance schedule can help prevent this code.