AutoCodes – Cadillac – P0B84 Cadillac

P0B84 Cadillac Code - Hybrid/Electric Vehicle Battery 15 Circuit High 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: P0B84 Cadillac indicates Hybrid/Electric Vehicle Battery 15 Circuit High 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 933

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 P0B84 Cadillac 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 P0B84 Cadillac - Hybrid/Electric Vehicle Battery 15 Circuit High Voltage - AutoCodes.com — P0B84 Cadillac Code - Hybrid/Electric Vehicle Battery 15 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0B84 Cadillac?

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

How to Fix the DTC P0B84 Cadillac?

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 P0B84 Cadillac 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 P0B84 Cadillac Code

1. What does the OBDII code P0B84 mean on a Cadillac?

P0B84 indicates a "Hybrid/Electric Vehicle Battery 15 Circuit High Voltage" issue, meaning the voltage on battery circuit 15 is higher than the expected range.

2. What are the common symptoms of code P0B84 in a Cadillac?

Symptoms may include a check engine light, reduced fuel efficiency, limited hybrid/electric functionality, or the vehicle entering a limp mode.

3. What causes the P0B84 code to appear on a Cadillac?

This code is typically caused by a faulty battery sensor, damaged wiring or connectors, a malfunctioning battery control module, or an imbalance in the high-voltage battery pack.

4. Can I drive my Cadillac with a P0B84 code?

Driving with this code is not recommended, as it may lead to further damage or reduced hybrid/electric performance. Address the issue promptly.

5. How do you diagnose the P0B84 code on a Cadillac?

Diagnosis involves checking for related codes, inspecting the high-voltage battery and its wiring, testing the battery voltage sensor, and verifying the functionality of the battery control module.

6. How can I fix the P0B84 code on my Cadillac?

Repairs might include replacing a damaged sensor, repairing or replacing faulty wiring, reprogramming the battery control module, or balancing the battery pack.

7. How much does it cost to fix a P0B84 code on a Cadillac?

Repair costs vary depending on the root cause but can range from $200 for minor sensor or wiring repairs to over $1,000 if the battery control module or high-voltage battery requires service.

8. Can a low 12V battery cause the P0B84 code in a Cadillac?

While unlikely, a low 12V battery can sometimes affect the hybrid systemâ€™s diagnostics and performance. Ensure the 12V battery is charged and functioning properly before further diagnosis.

9. Does resetting the code fix P0B84 on a Cadillac?

Resetting the code without addressing the underlying issue will likely result in the code returning. Proper diagnosis and repair are necessary.

10. Is a software update ever required for a P0B84 code in a Cadillac?

In some cases, a software update to the battery control module may be needed if the issue is related to outdated programming. Consult your dealership for guidance.