AutoCodes – Buick – P1BEF Buick

P1BEF Buick Code - Hybrid/Electric Vehicle Battery 89 Circuit High 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: P1BEF Buick indicates Hybrid/Electric Vehicle Battery 89 Circuit High 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 831

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 P1BEF Buick 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 P1BEF Buick - Hybrid/Electric Vehicle Battery 89 Circuit High Voltage - AutoCodes.com — P1BEF Buick Code - Hybrid/Electric Vehicle Battery 89 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1BEF Buick?

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

How to Fix the DTC P1BEF Buick?

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 P1BEF Buick 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 P1BEF Buick Code

1. What does the OBDII code P1BEF mean on a Buick?

The P1BEF code indicates "Hybrid/Electric Vehicle Battery 89 Circuit High Voltage," meaning the vehicle's hybrid battery system is detecting an abnormally high voltage in circuit 89.

2. What are the common symptoms of the P1BEF code in a Buick?

Symptoms may include warning lights on the dashboard, reduced hybrid system performance, limited power mode, or the inability to start the vehicle.

3. What causes the P1BEF code to appear?

Common causes include a damaged or malfunctioning hybrid battery module, faulty wiring or connectors in circuit 89, or a defective battery control module.

4. Can I drive my Buick with the P1BEF code?

It is not recommended to drive with this code active, as it could indicate a serious issue with the hybrid battery system that may lead to further damage or unsafe driving conditions.

5. How is the P1BEF code diagnosed?

A technician will use a scan tool to check for related codes, inspect the hybrid battery circuits and connectors, and test the voltage levels in circuit 89 for abnormalities.

6. How do I fix the P1BEF code on my Buick?

Repairs may involve replacing or repairing damaged wiring, connectors, or the hybrid battery module. In some cases, the battery control module may need reprogramming or replacement.

7. How much does it cost to repair the P1BEF code on a Buick?

Repair costs vary but can range from $200 for minor wiring repairs to several thousand dollars if the hybrid battery module needs replacement.

8. Can a weak 12V battery cause the P1BEF code?

While a weak 12V battery can cause various hybrid system issues, the P1BEF code specifically relates to high voltage in the hybrid battery circuit, making it less likely to be caused by the 12V battery.

9. Does the P1BEF code mean the hybrid battery needs replacement?

Not necessarily. The code indicates an issue with high voltage in the circuit, which could be caused by wiring, connectors, or the control module rather than the battery itself.

10. Can I clear the P1BEF code without repairs?

Clearing the code with a scan tool will remove it temporarily, but if the underlying issue isnâ€™t resolved, the code will likely return. Addressing the root cause is essential.