AutoCodes – Buick – P0B55 Buick

P0B55 Buick Code - Hybrid/Electric Vehicle Battery 6 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: P0B55 Buick indicates Hybrid/Electric Vehicle Battery 6 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 1,040

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 P0B55 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 P0B55 Buick - Hybrid/Electric Vehicle Battery 6 Circuit Performance - AutoCodes.com — P0B55 Buick Code - Hybrid/Electric Vehicle Battery 6 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P0B55 Buick?

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

How to Fix the DTC P0B55 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 P0B55 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 P0B55 Buick Code

1. What does the OBDII code P0B55 mean for a Buick?

The P0B55 code indicates an issue with the performance of the Hybrid/Electric Vehicle Battery 6 Circuit, which may involve voltage irregularities or communication problems in battery module 6.

2. What are common symptoms of the P0B55 code in a Buick?

Symptoms can include reduced fuel efficiency, decreased vehicle performance, warning lights on the dashboard, or the inability to operate in electric mode.

3. What causes the P0B55 code on a Buick?

Possible causes include a malfunctioning battery module, damaged wiring or connectors, a faulty battery management system, or internal corrosion within the battery circuit.

4. Can the P0B55 code cause long-term damage if ignored?

Yes, ignoring this code can lead to further damage to the hybrid battery system, reduced vehicle performance, and potentially expensive repairs.

5. How can I diagnose the P0B55 code on my Buick?

Diagnosis involves using an OBDII scanner to confirm the code, inspecting the battery module and wiring for damage, and testing the voltage and resistance of the circuit with specialized tools.

6. Can I drive my Buick with the P0B55 code active?

While it might still be drivable, operating the vehicle with this code can impair performance and lead to further issues with the hybrid system, so repairs should be made promptly.

7. How do I fix the P0B55 code on a Buick?

Repairs may include replacing the affected battery module, repairing damaged wiring or connectors, or recalibrating the battery management system.

8. What should a mechanic check first when addressing the P0B55 code?

A mechanic should first inspect the wiring and connectors for damage or corrosion, then test the battery moduleâ€™s voltage and communication signals.

9. Can a software update resolve the P0B55 code?

In some cases, a software recalibration or update to the battery management system might resolve the issue, though hardware repairs may still be required.

10. Is the P0B55 code specific to certain Buick models?

Yes, this code is typically found on Buick models equipped with hybrid or electric powertrains that use a battery management system to monitor individual modules.