AutoCodes – GMC – P1BF4 GMC

P1BF4 GMC 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 GMC 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 803

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

What does this mean?

What are the Possible Causes of the DTC P1BF4 GMC?

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

How to Fix the DTC P1BF4 GMC?

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 GMC 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 GMC Code

1. What are the common symptoms of OBDII code P1BF4 in a GMC hybrid/electric vehicle?

- Common symptoms may include poor fuel efficiency, reduced power, and potential difficulty starting the vehicle.

2. What are the possible causes of OBDII code P1BF4 indicating Hybrid/Electric Vehicle Battery 91 Circuit Low Voltage in a GMC?

- The code could be triggered by issues such as a faulty battery, damaged wiring, or a malfunctioning battery management system.

3. How can I diagnose the source of the Hybrid/Electric Vehicle Battery 91 Circuit Low Voltage error code in my GMC?

- To diagnose the issue, perform a thorough inspection of the hybrid/electric battery system, check for loose connections, and use a multimeter to test voltage levels.

4. Can driving with the OBDII code P1BF4 present cause further damage to my GMC's hybrid/electric system?

- Continuing to drive with this code present can potentially lead to further damage to the battery system and may result in reduced performance.

5. Are there any DIY repair tips for resolving the Hybrid/Electric Vehicle Battery 91 Circuit Low Voltage code in a GMC?

- DIY repair tips include checking and tightening battery connections, inspecting for visible damage to wiring, and ensuring the battery cooling system is functioning properly.

6. Is it safe to reset the OBDII code P1BF4 in a GMC hybrid/electric vehicle using a diagnostic tool?

- While resetting the code may temporarily clear the warning, it is crucial to address the underlying issue causing the code to prevent potential safety hazards.

7. How can a professional mechanic help in diagnosing and repairing the OBDII code P1BF4 related to a GMC's hybrid/electric system?

- A professional mechanic can conduct in-depth diagnostics using specialized tools, pinpoint the exact cause of the code, and perform necessary repairs or replacements with precision.

8. What role does the battery management system play in the occurrence of OBDII code P1BF4 in a GMC hybrid/electric vehicle?

- The battery management system is crucial for monitoring and regulating the voltage levels in the battery, and any malfunction in this system can trigger the code.

9. Are there any specific maintenance practices to prevent the occurrence of the Hybrid/Electric Vehicle Battery 91 Circuit Low Voltage code in a GMC?

- Regularly checking the battery system, ensuring proper cooling, and following the manufacturer's recommended maintenance schedule can help prevent this code from appearing.

10. Can extreme weather conditions impact the likelihood of the OBDII code P1BF4 occurring in a GMC hybrid/electric vehicle?

- Yes, extreme temperatures can affect the performance of the battery system, potentially leading to voltage issues and triggering the Hybrid/Electric Vehicle Battery 91 Circuit Low Voltage code.