AutoCodes – Chevrolet – P1B4F Chevrolet

P1B4F Chevrolet Code - Hybrid/Electric Vehicle Battery 36 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: P1B4F Chevrolet indicates Hybrid/Electric Vehicle Battery 36 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 1,131

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 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B4F 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 P1B4F Chevrolet - Hybrid/Electric Vehicle Battery 36 Circuit Low Voltage - AutoCodes.com — P1B4F Chevrolet Code - Hybrid/Electric Vehicle Battery 36 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B4F Chevrolet?

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

How to Fix the DTC P1B4F 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 P1B4F 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.

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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 P1B4F Chevrolet Code

1. What are common symptoms of OBDII code P1B4F in a Chevrolet hybrid/electric vehicle?

- Common symptoms include reduced electric vehicle range, poor performance, and potentially a warning light on the dashboard indicating a battery issue.

2. What does the OBDII code P1B4F Chevrolet Hybrid/Electric Vehicle Battery 36 Circuit Low Voltage indicate?

- This code indicates that there is low voltage in the battery circuit 36 of a Chevrolet hybrid or electric vehicle.

3. What are possible causes of the P1B4F code in a Chevrolet hybrid/electric vehicle?

- Possible causes include a faulty battery cell, damaged wiring in circuit 36, a failing battery management system, or issues with the charging system.

4. How can I diagnose the P1B4F code in my Chevrolet hybrid/electric vehicle?

- Diagnosis typically involves using a scan tool to read the code, checking the voltage levels in circuit 36, inspecting the battery cells, and testing the wiring for any faults.

5. Can I continue driving my Chevrolet hybrid/electric vehicle with the P1B4F code present?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the battery system and potentially impact the vehicle's performance.

6. What are the repair options for resolving the P1B4F code in a Chevrolet hybrid/electric vehicle?

- Repair options may include replacing a faulty battery cell, repairing damaged wiring, recalibrating the battery management system, or addressing issues with the charging system.

7. Is it possible to reset the P1B4F code in a Chevrolet hybrid/electric vehicle without addressing the underlying issue?

- While clearing the code may temporarily turn off the warning light, it is crucial to address the underlying issue causing the low voltage in circuit 36 to prevent further problems.

8. Are there any maintenance tips to prevent the recurrence of the P1B4F code in a Chevrolet hybrid/electric vehicle?

- Regularly inspecting and maintaining the battery system, following the manufacturer's recommended maintenance schedule, and avoiding overcharging or deep discharging the battery can help prevent this code from reoccurring.

9. Can a DIY enthusiast address the P1B4F code in a Chevrolet hybrid/electric vehicle, or is professional assistance necessary?

- Depending on the skill level and knowledge of the individual, some aspects of diagnosing and repairing the code may be tackled by a DIY enthusiast. However, due to the complexity of the battery system, professional assistance is often recommended.

10. How much can I expect to pay for repairs related to the P1B4F code in a Chevrolet hybrid/electric vehicle?

- The cost of repairs can vary depending on the specific issue causing the code, the need for replacement parts, and labor costs. It is advisable to consult with a trusted mechanic or dealership for an accurate estimate.