AutoCodes – Buick – P1B84 Buick

P1B84 Buick Code - Hybrid/Electric Vehicle Battery 54 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: P1B84 Buick indicates Hybrid/Electric Vehicle Battery 54 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 934

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 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B84 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 P1B84 Buick - Hybrid/Electric Vehicle Battery 54 Circuit Performance - AutoCodes.com — P1B84 Buick Code - Hybrid/Electric Vehicle Battery 54 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B84 Buick?

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

How to Fix the DTC P1B84 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 P1B84 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 P1B84 Buick Code

What does the OBDII code P1B84 mean in a Buick?

The P1B84 code indicates a performance issue in the Hybrid/Electric Vehicle Battery 54 Circuit, which typically relates to the battery management system monitoring one of the battery cells or circuits.

What are the common symptoms of the P1B84 code in a Buick?

Symptoms may include an illuminated check engine light, reduced hybrid/electric system performance, decreased fuel efficiency, or limited electric driving range.

What causes the P1B84 code to appear?

Possible causes include a faulty hybrid battery cell, a damaged wiring harness or connector, issues with the battery management system, or corrosion affecting circuit performance.

Can I drive my Buick with the P1B84 code?

Itâ€™s not recommended, as driving with this code may lead to reduced hybrid/electric performance or further damage to the battery system.

How is the P1B84 code diagnosed?

A mechanic will use a scan tool to confirm the code, inspect the hybrid battery and its connections, and test the affected circuit for voltage and resistance abnormalities.

What repairs can fix the P1B84 code in a Buick?

Repairs may include replacing the faulty hybrid battery cell, repairing or replacing damaged wiring or connectors, or addressing issues in the battery management system.

How much does it cost to repair the P1B84 code?

Repair costs vary depending on the root cause but can range from $100 for minor wiring repairs to over $1,000 if the hybrid battery or its control module needs replacement.

Can a weak 12V battery trigger the P1B84 code?

While unlikely, issues with the 12V battery could interfere with the vehicleâ€™s electrical system, so itâ€™s worth testing the 12V battery as part of the diagnosis.

Does the P1B84 code require hybrid battery replacement?

Not always. The issue may be isolated to a single battery cell or circuit, which can sometimes be repaired without replacing the entire battery.

How can I prevent the P1B84 code from reoccurring?

Regular maintenance, including inspecting the hybrid battery system, ensuring connectors are secure and corrosion-free, and addressing electrical issues promptly, can help prevent this code.