AutoCodes – Chevrolet – P1BF4 Chevrolet

P1BF4 Chevrolet Code - Hybrid/Electric Vehicle Battery 91 Circuit Low 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: P1BF4 Chevrolet indicates Hybrid/Electric Vehicle Battery 91 Circuit Low 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 949

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 14, 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 P1BF4 Chevrolet 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 P1BF4 Chevrolet - Hybrid/Electric Vehicle Battery 91 Circuit Low Voltage - AutoCodes.com — P1BF4 Chevrolet Code - Hybrid/Electric Vehicle Battery 91 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1BF4 Chevrolet?

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

How to Fix the DTC P1BF4 Chevrolet?

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 P1BF4 Chevrolet 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 P1BF4 Chevrolet code?

Need more information on how to fix the P1BF4 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1BF4 Chevrolet 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 P1BF4 Chevrolet Code

1. What does the OBDII code P1BF4 mean on a Chevrolet?

The P1BF4 code indicates a "Hybrid/Electric Vehicle Battery 91 Circuit Low Voltage," which suggests an issue with the voltage in the battery circuit for cell 91 in the hybrid or electric vehicle battery pack.

2. What are the common symptoms of the P1BF4 code in a Chevrolet?

Symptoms may include reduced vehicle performance, warning lights on the dashboard (like the check engine light or hybrid system warning), and difficulty maintaining battery charge.

3. What causes the P1BF4 code to appear on a Chevrolet hybrid or EV?

The main causes include a faulty battery cell, poor electrical connections, corroded terminals, damaged wiring, or a malfunctioning battery management system.

4. Can I continue driving my Chevrolet with the P1BF4 code?

While the vehicle may still operate, driving with this code can lead to further damage to the hybrid or EV battery. Itâ€™s best to address the issue promptly.

5. How do technicians diagnose the P1BF4 code in a Chevrolet?

Technicians use a scan tool to read the code and monitor battery cell voltage levels, inspect the wiring and connections to battery cell 91, and perform tests on the battery management system.

6. Is the P1BF4 code related to a failing hybrid battery in a Chevrolet?

It could indicate a failing battery cell, but it may also result from wiring or connection issues. A professional diagnosis is necessary to determine the exact cause.

7. How much does it cost to repair the P1BF4 code on a Chevrolet?

Repair costs vary depending on the issue. Fixing wiring or connections may be inexpensive, but replacing a hybrid battery module can cost significantly more, often several thousand dollars.

8. Can I fix the P1BF4 code myself on a Chevrolet?

Basic tasks like checking for loose or corroded connections might be manageable, but diagnosing and repairing hybrid battery issues typically requires specialized tools and expertise.

9. Does the P1BF4 code mean the entire hybrid battery needs replacement?

Not necessarily. If only cell 91 is affected, it might be possible to replace or repair just that specific cell instead of the entire battery pack.

10. How can I prevent the P1BF4 code from occurring in my Chevrolet?

Regular maintenance, ensuring proper battery cooling, and addressing any electrical issues promptly can help prevent hybrid battery-related codes like P1BF4.