AutoCodes – Buick – P1BF9 Buick

P1BF9 Buick Code - Hybrid/Electric Vehicle Battery 93 Circuit Performance

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: P1BF9 Buick indicates Hybrid/Electric Vehicle Battery 93 Circuit Performance.
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 838

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 P1BF9 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 P1BF9 Buick - Hybrid/Electric Vehicle Battery 93 Circuit Performance - AutoCodes.com — P1BF9 Buick Code - Hybrid/Electric Vehicle Battery 93 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1BF9 Buick?

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

How to Fix the DTC P1BF9 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 P1BF9 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 P1BF9 Buick Code

1. What does the OBDII code P1BF9 mean on a Buick?

The P1BF9 code indicates an issue with the "Hybrid/Electric Vehicle Battery 93 Circuit Performance," which relates to the performance or functionality of a specific battery cell or circuit in the hybrid/electric system.

2. What are the common symptoms of the P1BF9 code in a Buick?

Symptoms may include a check engine light, reduced hybrid/electric vehicle performance, decreased fuel efficiency, and possible warning messages related to the battery or hybrid system.

3. What causes the P1BF9 code in a Buick?

Common causes include a faulty battery cell or module, poor electrical connections, damaged wiring in the battery circuit, or a malfunctioning battery management system.

4. Can I drive my Buick with the P1BF9 code?

It is not recommended to drive for long periods with this code, as it may lead to further damage to the hybrid system or reduced performance.

5. How is the P1BF9 code diagnosed?

A technician will use a scan tool to read the code and check for related codes, inspect the hybrid battery and its connections, and test the battery control module for proper operation.

6. What repairs are needed to fix the P1BF9 code?

Repairs may include replacing a faulty battery cell/module, repairing or replacing damaged wiring, cleaning or securing electrical connections, or reprogramming/updating the battery control module.

7. How much does it cost to repair the P1BF9 code in a Buick?

Repair costs vary but can range from $200 for minor wiring repairs to over $1,000 if a hybrid battery module or control unit needs replacement.

8. Can a dead 12-volt battery cause the P1BF9 code?

No, the P1BF9 code specifically relates to the high-voltage hybrid battery, not the 12-volt auxiliary battery.

9. Does the P1BF9 code mean the entire hybrid battery needs replacement?

Not necessarily. In many cases, only a specific cell or module within the battery may need repair or replacement.

10. Can the P1BF9 code be cleared without repairs?

Clearing the code without addressing the underlying issue will likely result in the code and symptoms returning. Proper diagnosis and repairs are essential.