AutoCodes – Generic – P1BF4

P1BF4 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 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.

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Code Popularity 899

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

What does this mean?

What are the Possible Causes of the DTC P1BF4?

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

How to Fix the DTC P1BF4?

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 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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Need Help with the Code?

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Information for Specific Makes

P1BF4 Buick — Hybrid/Electric Vehicle Battery 91 Circuit Low Voltage
P1BF4 Cadillac — Hybrid/Electric Vehicle Battery 91 Circuit Low Voltage
P1BF4 Chevrolet — Hybrid/Electric Vehicle Battery 91 Circuit Low Voltage
P1BF4 GMC — Hybrid/Electric Vehicle Battery 91 Circuit Low Voltage
P1BF4 Saturn — Hybrid/Electric Vehicle Battery 91 Circuit Low Voltage

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 Code

1. What are the common symptoms of OBDII code P1BF4 (Hybrid/Electric Vehicle Battery 91 Circuit Low Voltage)?

- Common symptoms include poor fuel economy, difficulty starting the vehicle, reduced power output, and potential illumination of the check engine light.

2. What are the possible causes of OBDII code P1BF4?

- The code P1BF4 may be triggered by issues such as a faulty battery pack, damaged wiring in the battery circuit, a failing battery control module, or a weak hybrid battery.

3. How can I diagnose the OBDII code P1BF4?

- Diagnosis typically involves using a professional OBDII scanner to read the code, inspecting the battery connections and wiring for any visible damage, and testing the battery's voltage levels.

4. Can I continue driving with OBDII code P1BF4 present?

- It is not recommended to drive the vehicle with code P1BF4 active, as it can lead to further damage to the hybrid/electric vehicle system and potentially leave you stranded.

5. How can I repair OBDII code P1BF4 on my hybrid/electric vehicle?

- Repairing code P1BF4 may involve replacing the faulty battery pack, repairing damaged wiring, resetting the battery control module, or consulting a professional technician for further diagnosis and repair.

6. Are there any safety precautions to consider when dealing with OBDII code P1BF4?

- It is crucial to disconnect the high-voltage system in hybrid/electric vehicles before attempting any repairs related to the battery circuit to prevent the risk of electric shock or injury.

7. Will resetting the OBDII code P1BF4 turn off the check engine light?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue is not resolved, the light is likely to come back on once the system detects the problem again.

8. How often does OBDII code P1BF4 (Hybrid/Electric Vehicle Battery 91 Circuit Low Voltage) occur in hybrid/electric vehicles?

- Code P1BF4 can occur in hybrid/electric vehicles when there are issues with the battery circuit, and its frequency may vary depending on the vehicle's age, maintenance, and driving conditions.

9. Can extreme weather conditions affect the triggering of OBDII code P1BF4?

- Yes, extreme temperatures, both hot and cold, can impact the performance of hybrid/electric vehicle batteries and potentially lead to issues triggering code P1BF4.

10. Is it possible to prevent OBDII code P1BF4 from occurring in my hybrid/electric vehicle?

- Regular maintenance, including checking the battery's health, keeping the connections clean and secure, and following the manufacturer's recommended service intervals, can help prevent issues that trigger code P1BF4.