AutoCodes – Cadillac – P1BF4 Cadillac

P1BF4 Cadillac 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 Cadillac 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 725

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

What does this mean?

What are the Possible Causes of the DTC P1BF4 Cadillac?

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

How to Fix the DTC P1BF4 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 P1BF4 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 P1BF4 Cadillac Code

1. What does the OBDII code P1BF4 mean on a Cadillac?

The P1BF4 code indicates a "Hybrid/Electric Vehicle Battery 91 Circuit Low Voltage," which points to a low voltage issue in a specific cell or circuit of the hybrid/electric vehicleâ€™s battery pack.

2. What are the common symptoms of the P1BF4 code?

Symptoms may include reduced fuel economy, limited hybrid or electric mode functionality, warning lights on the dashboard, or difficulty starting the vehicle.

3. What causes the P1BF4 code to appear?

Common causes include a faulty battery cell, damaged wiring or connectors in the battery circuit, a malfunctioning battery control module, or excessive battery degradation.

4. Can I drive my Cadillac with the P1BF4 code?

Driving with the P1BF4 code is not recommended, as it may lead to further damage to the hybrid/electric system or result in a loss of power while driving.

5. How is the P1BF4 code diagnosed?

A technician will typically use a scan tool to confirm the code, inspect the battery pack and its wiring for damage, and test the voltage of the affected battery circuit.

6. What repairs are typically needed for the P1BF4 code?

Repairs may include replacing the faulty battery cell, repairing or replacing damaged wiring or connectors, or recalibrating or replacing the battery control module.

7. Is the P1BF4 code covered under warranty?

In many cases, hybrid or EV battery-related issues may be covered under the manufacturerâ€™s hybrid system warranty. Check your Cadillac's warranty terms for specifics.

8. How much does it cost to fix the P1BF4 code?

Repair costs can vary widely depending on the exact issue, but replacing individual battery cells or wiring repairs is generally less expensive than replacing the entire battery pack.

9. Can a low 12-volt battery cause the P1BF4 code?

No, the P1BF4 code specifically relates to the hybrid/electric high-voltage battery system, not the 12-volt auxiliary battery.

10. How can I prevent the P1BF4 code from occurring?

Regular maintenance, avoiding deep discharges of the hybrid battery, and ensuring proper cooling of the battery system can help reduce the likelihood of this code appearing.