AutoCodes – Saturn – P1BF4 Saturn

P1BF4 Saturn 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 Saturn 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 765

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

What does this mean?

What are the Possible Causes of the DTC P1BF4 Saturn?

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

How to Fix the DTC P1BF4 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 P1BF4 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.

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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 P1BF4 Saturn Code

1. What are the common symptoms of OBDII code P1BF4 in a Saturn Hybrid/Electric Vehicle?

- Common symptoms include decreased fuel efficiency, loss of power, and the illumination of the check engine light.

2. What are the possible causes of the OBDII code P1BF4 in a Saturn Hybrid/Electric Vehicle?

- The code P1BF4 typically indicates a low voltage issue in the 91 circuit of the hybrid/electric vehicle battery. Potential causes may include a faulty battery cell, damaged wiring, or a malfunctioning battery management system.

3. How can I diagnose the OBDII code P1BF4 in my Saturn Hybrid/Electric Vehicle?

- Diagnosing the code P1BF4 usually involves using an OBDII scanner to retrieve the specific fault code and then inspecting the hybrid/electric vehicle battery, wiring, and battery management system for any visible damage or issues.

4. Is it safe to continue driving my Saturn Hybrid/Electric Vehicle with the OBDII code P1BF4 present?

- It is not recommended to drive the vehicle with the code P1BF4 active, as it can lead to further damage to the hybrid/electric vehicle battery and potentially compromise the vehicle's performance and safety.

5. Can I reset the OBDII code P1BF4 in my Saturn Hybrid/Electric Vehicle by disconnecting the battery?

- While disconnecting the battery may clear the code temporarily, it is important to address the underlying issue causing the code to prevent it from reoccurring. Resetting the code without proper diagnosis and repair may lead to more serious problems.

6. What are some repair tips for fixing the OBDII code P1BF4 in a Saturn Hybrid/Electric Vehicle?

- Repair tips may include checking and replacing any damaged wiring, testing and potentially replacing faulty battery cells, and ensuring the battery management system is functioning correctly.

7. Can I repair the OBDII code P1BF4 in my Saturn Hybrid/Electric Vehicle myself, or do I need professional help?

- Repairing the code P1BF4 may require specialized knowledge and tools related to hybrid/electric vehicle systems. It is recommended to seek professional help from a certified technician or dealership experienced in working on hybrid/electric vehicles.

8. How much does it typically cost to repair the OBDII code P1BF4 in a Saturn Hybrid/Electric Vehicle?

- The cost of repairing the code P1BF4 can vary depending on the specific issue causing the code, the extent of the damage, and whether any parts need to be replaced. It is advisable to obtain a diagnosis and repair estimate from a qualified technician.

9. Are there any preventative maintenance measures I can take to avoid the OBDII code P1BF4 in my Saturn Hybrid/Electric Vehicle?

- Regularly inspecting the hybrid/electric vehicle battery, monitoring its performance, and following the manufacturer's recommended maintenance schedule can help prevent issues that may trigger the code P1BF4.

10. How long does it typically take to repair the OBDII code P1BF4 in a Saturn Hybrid/Electric Vehicle?

- The repair time for the code P1BF4 can vary depending on the complexity of the issue and the availability of parts. In some cases, repairs may be completed within a few hours, while more extensive repairs may take longer.