AutoCodes – Buick – P1B28 Buick

P1B28 Buick Code - Hybrid/Electric Vehicle Battery 27 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: P1B28 Buick indicates Hybrid/Electric Vehicle Battery 27 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 757

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 P1B28 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 P1B28 Buick - Hybrid/Electric Vehicle Battery 27 Circuit - AutoCodes.com — P1B28 Buick Code - Hybrid/Electric Vehicle Battery 27 Circuit

What does this mean?

What are the Possible Causes of the DTC P1B28 Buick?

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

How to Fix the DTC P1B28 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 P1B28 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 P1B28 Buick Code

What does the OBDII code P1B28 mean for a Buick?

The OBDII code P1B28 indicates an issue with the Hybrid/Electric Vehicle Battery 27 Circuit, which typically relates to the battery management system.

What are the common symptoms of the P1B28 code?

Common symptoms include reduced hybrid system performance, warning lights on the dashboard, and possible difficulty starting the vehicle.

What could cause the P1B28 code to trigger?

Causes can include a faulty battery management module, poor electrical connections, damaged wiring, or issues with the hybrid battery itself.

How can I diagnose the P1B28 code?

To diagnose the P1B28 code, you can use an OBDII scanner to confirm the code, inspect the battery connections and wiring, and check the battery management module for faults.

Can I drive my Buick with the P1B28 code active?

While it may be possible to drive the vehicle, it is not recommended, as it can lead to further damage to the hybrid system and reduce overall performance.

What are some potential repairs for the P1B28 code?

Potential repairs may include replacing damaged wiring, fixing poor electrical connections, or replacing the battery management module if it is determined to be faulty.

Is the P1B28 code a serious issue?

Yes, the P1B28 code can indicate a serious issue with the hybrid battery system, and addressing it promptly is important to avoid further complications.

How much does it cost to fix the P1B28 code?

Repair costs can vary widely depending on the specific problem, but it could range from a few hundred to several thousand dollars, especially if the hybrid battery needs replacement.

Can I clear the P1B28 code myself?

You can clear the code using an OBDII scanner, but if the underlying issue is not resolved, the code may reappear, indicating the need for further diagnosis and repair.