AutoCodes – Buick – P0B56 Buick

P0B56 Buick Code - Hybrid/Electric Vehicle Battery 6 Circuit Low 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: P0B56 Buick indicates Hybrid/Electric Vehicle Battery 6 Circuit Low 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 928

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 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B56 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 P0B56 Buick - Hybrid/Electric Vehicle Battery 6 Circuit Low Voltage - AutoCodes.com — P0B56 Buick Code - Hybrid/Electric Vehicle Battery 6 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0B56 Buick?

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

How to Fix the DTC P0B56 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 P0B56 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 P0B56 Buick Code

What does the OBDII code P0B56 mean in a Buick?

The code P0B56 indicates a low voltage issue in the hybrid/electric vehicle battery 6 circuit, which may affect the performance of the vehicle's electrical system.

What are the symptoms of P0B56 in a Buick?

Common symptoms include reduced fuel efficiency, warning lights on the dashboard, limited power output, and potential difficulty starting the vehicle.

What causes the P0B56 code to appear?

Causes may include a faulty battery cell, damaged wiring or connectors in the battery circuit, a malfunctioning battery management system, or internal corrosion in the battery pack.

Can I drive my Buick with the P0B56 code?

Driving with this code may lead to reduced vehicle performance and potential damage to the hybrid/electric system. It's recommended to address the issue promptly.

How is the P0B56 code diagnosed?

Technicians will typically use a scan tool to read the code, inspect the battery wiring and connections, and test the voltage levels of the affected battery cells.

What repairs are commonly needed to fix the P0B56 code?

Repairs may include replacing damaged wiring, repairing or replacing the battery pack, and updating or reprogramming the battery management system.

How much does it cost to repair the P0B56 code in a Buick?

Repair costs vary depending on the exact issue but can range from $200 for minor wiring fixes to over $1,000 for battery pack replacement.

Can the P0B56 code be caused by temperature extremes?

Yes, extreme hot or cold temperatures can affect battery performance and potentially trigger this code.

How can I prevent the P0B56 code from occurring?

Regular maintenance of the hybrid/electric system, avoiding extreme temperatures, and promptly addressing battery-related warnings can help prevent this issue.

Does the P0B56 code require specialized tools to repair?

Yes, diagnosing and repairing this code often requires specialized tools and equipment to test and service hybrid/electric vehicle systems.