AutoCodes – Generic – P1B84

P1B84 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 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 1,616

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 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 - Hybrid/Electric Vehicle Battery 54 Circuit Performance - AutoCodes.com — P1B84 Code - Hybrid/Electric Vehicle Battery 54 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B84?

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

How to Fix the DTC P1B84?

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 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.

Need more information about the P1B84 code?

Need more information on how to fix the P1B84 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1B84 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1B84 Buick — Hybrid/Electric Vehicle Battery 54 Circuit Performance
P1B84 Cadillac — Hybrid/Electric Vehicle Battery 54 Circuit Performance
P1B84 Chevrolet — Hybrid/Electric Vehicle Battery 54 Circuit Performance
P1B84 GMC — Hybrid/Electric Vehicle Battery 54 Circuit Performance
P1B84 Saturn — Hybrid/Electric Vehicle Battery 54 Circuit Performance

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 Code

1. What are common symptoms associated with OBDII code P1B84 (Hybrid/Electric Vehicle Battery 54 Circuit Performance)?

The common symptoms include reduced hybrid system performance, decreased fuel efficiency, and potential warning lights on the dashboard.

2. What are the possible causes of OBDII code P1B84?

The code P1B84 can be triggered by issues such as a faulty battery pack, damaged battery cells, poor battery connections, or problems with the battery management system.

3. How can I diagnose the OBDII code P1B84?

Diagnosing the code P1B84 typically involves using a professional OBDII scanner to retrieve the code, inspecting the battery pack and connections for physical damage, and conducting voltage tests on the battery cells.

4. Can I continue driving my vehicle with the OBDII code P1B84 present?

It is not recommended to continue driving with the P1B84 code active, as it can lead to further damage to the hybrid/electric vehicle's battery system and may result in complete system failure.

5. How should I repair OBDII code P1B84?

Repairing the P1B84 code usually involves replacing any faulty battery cells, repairing damaged connections, or recalibrating the battery management system. It is recommended to seek professional assistance for proper repairs.

6. Are there any maintenance tips to prevent OBDII code P1B84 from appearing?

Regularly maintaining the hybrid/electric vehicle's battery system, following manufacturer-recommended service schedules, and avoiding extreme temperature conditions can help prevent the occurrence of code P1B84.

7. Can a DIY enthusiast fix OBDII code P1B84 at home?

While some basic inspections and maintenance tasks can be performed by DIY enthusiasts, diagnosing and repairing the P1B84 code often requires specialized knowledge and tools, so it is advisable to consult a professional technician.

8. How much does it typically cost to repair OBDII code P1B84?

The cost of repairing the P1B84 code can vary depending on the extent of the damage, the need for replacement parts, and labor costs. It is recommended to obtain quotes from reputable repair shops for an accurate estimate.

9. Will resetting the OBDII system clear the P1B84 code?

Resetting the OBDII system may temporarily clear the P1B84 code, but if the underlying issue is not addressed, the code is likely to reappear. It is crucial to diagnose and repair the root cause of the problem.

10. Is OBDII code P1B84 specific to certain hybrid/electric vehicle models?

The P1B84 code related to Hybrid/Electric Vehicle Battery 54 Circuit Performance can be specific to certain makes and models of hybrid or electric vehicles. It is essential to refer to the vehicle's specific diagnostic manual for accurate information.