AutoCodes – Cadillac – P1B4F Cadillac

P1B4F Cadillac 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 Cadillac 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 1,101

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 Cadillac 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 Cadillac - Hybrid/Electric Vehicle Battery 36 Circuit Low Voltage - AutoCodes.com — P1B4F Cadillac Code - Hybrid/Electric Vehicle Battery 36 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B4F Cadillac?

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

How to Fix the DTC P1B4F Cadillac?

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 Cadillac 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 Cadillac Code

1. What are common symptoms of OBDII code P1B4F Cadillac?

- Common symptoms include a decrease in hybrid/electric vehicle performance, reduced fuel efficiency, and potential issues with starting the vehicle.

2. What are the possible causes of code P1B4F Cadillac?

- Possible causes may include a malfunctioning hybrid/electric vehicle battery, a faulty battery management system, loose or corroded battery connections, or issues with the battery charging system.

3. How can I diagnose code P1B4F Cadillac?

- Diagnosis typically involves using a scan tool to read the code, checking the battery voltage levels, inspecting battery connections, and testing the battery management system components for proper operation.

4. Can I drive my vehicle with code P1B4F Cadillac?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the hybrid/electric vehicle battery and potentially cause safety hazards.

5. How can I repair OBDII code P1B4F Cadillac?

- Repair options may include replacing the hybrid/electric vehicle battery, repairing or replacing faulty battery management system components, cleaning and tightening battery connections, and ensuring proper charging system operation.

6. Will resetting the code make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue causing the code is not addressed, it is likely to reappear. It is important to diagnose and repair the root cause of the code.

7. How much does it cost to fix code P1B4F Cadillac?

- The cost of fixing this code can vary depending on the specific issue causing it, the extent of the repairs needed, and whether any parts need to be replaced. It is recommended to consult with a professional technician for an accurate cost estimate.

8. Can a DIY enthusiast repair OBDII code P1B4F Cadillac?

- While some basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing complex electrical issues related to hybrid/electric vehicle batteries is best left to experienced professionals due to the high voltage and technical nature of the components involved.

9. How long does it take to repair code P1B4F Cadillac?

- The repair time can vary depending on the exact cause of the code and the complexity of the repairs needed. Simple fixes like tightening connections may take a short time, while more extensive repairs like battery replacement can take longer.

10. Are there any preventive maintenance tips to avoid code P1B4F Cadillac?

- Regularly inspecting and maintaining the hybrid/electric vehicle battery, keeping battery connections clean and secure, following recommended charging practices, and addressing any issues promptly can help prevent code P1B4F Cadillac and other related problems.