AutoCodes – Saturn – P0B84 Saturn

P0B84 Saturn 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 Saturn 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 839

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC P0B84 Saturn?

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

How to Fix the DTC P0B84 Saturn?

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 Saturn 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 P0B84 Saturn code?

Need more information on how to fix the P0B84 Saturn code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0B84 Saturn code diagnosed by a professional: Find a repair shop in your area

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 Saturn Code

1. What does the OBDII code P0B84 mean in a Saturn?

The P0B84 code indicates a "Hybrid/Electric Vehicle Battery 15 Circuit High Voltage" issue, meaning the vehicle's hybrid battery system has detected abnormally high voltage in the Battery 15 circuit.

2. What are the common symptoms of the P0B84 code?

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

3. What causes the P0B84 code to be triggered?

The code can be caused by a faulty hybrid battery cell, a short circuit, damaged wiring or connectors, or a malfunctioning battery control module.

4. Can I drive my Saturn with the P0B84 code?

It is not recommended to drive the vehicle as it may lead to further damage to the battery system or leave you stranded if the hybrid system fails completely.

5. How is the P0B84 code diagnosed?

A technician will use a scan tool to read hybrid battery data, inspect wiring and connectors, and test individual battery modules to identify the source of the high voltage.

6. What repairs are needed to fix the P0B84 code?

Repairs may include replacing a faulty battery module, repairing or replacing damaged wiring, or replacing the battery control module if it is defective.

7. How much does it cost to repair the P0B84 code?

Repair costs vary depending on the issue, but replacing a hybrid battery module can range from $1,000 to $4,000, while wiring repairs may cost significantly less.

8. Can a weak 12-volt battery cause the P0B84 code?

While unlikely, a weak 12-volt battery can sometimes affect hybrid system diagnostics. Itâ€™s important to check and ensure the 12-volt battery is healthy during the repair process.

9. How can I prevent the P0B84 code from occurring?

Regular maintenance of your hybrid system, ensuring proper cooling for the battery pack, and promptly addressing warning lights can help prevent this code.

10. Does the P0B84 code always mean the hybrid battery needs replacing?

Not always. The code may be caused by wiring issues, a sensor malfunction, or a problem with the battery control module rather than the battery itself.