AutoCodes – Buick – P1BC6 Buick

P1BC6 Buick Code - Hybrid/Electric Vehicle Battery 76 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: P1BC6 Buick indicates Hybrid/Electric Vehicle Battery 76 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 867

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 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1BC6 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 P1BC6 Buick - Hybrid/Electric Vehicle Battery 76 Circuit Performance - AutoCodes.com — P1BC6 Buick Code - Hybrid/Electric Vehicle Battery 76 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1BC6 Buick?

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

How to Fix the DTC P1BC6 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 P1BC6 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 P1BC6 Buick Code

1. What does the OBDII code P1BC6 mean on a Buick?

P1BC6 indicates a "Hybrid/Electric Vehicle Battery 76 Circuit Performance" issue, typically related to a performance problem in the hybrid or EV battery module 76 circuit.

2. What are common symptoms of code P1BC6 in a Buick?

Symptoms may include a check engine light, reduced fuel efficiency, limited hybrid functionality, or decreased vehicle performance.

3. What causes the P1BC6 code to trigger?

The code is often caused by issues such as a faulty battery cell/module, damaged wiring, poor electrical connections, or a malfunctioning battery control module.

4. Can I drive my Buick with the P1BC6 code active?

Driving with this code is not recommended, as it may affect hybrid system performance or lead to further damage in the battery system.

5. How is the P1BC6 code diagnosed?

Diagnosis typically involves using a scan tool to check for additional codes, inspecting the battery module 76 circuitry, and testing for proper voltage and connections.

6. What repairs are needed to fix the P1BC6 code?

Repairs may include replacing faulty battery modules, repairing or replacing damaged wiring, or reprogramming/updating the battery control module.

7. How much does it cost to fix the P1BC6 code on a Buick?

Repair costs vary widely depending on whether it's wiring repair, module replacement, or reprogramming, but it can range from $200 to $2,000 or more.

8. Can a weak 12V battery cause the P1BC6 code?

While unlikely, a weak 12V battery can sometimes cause hybrid system faults. Testing the 12V battery is a good first step during diagnostics.

9. Will resetting the code fix the P1BC6 issue?

Resetting the code may temporarily turn off the check engine light, but the underlying problem will likely persist and cause the code to return.

10. Is the P1BC6 code specific to certain Buick models?

It is most commonly found in hybrid or electric Buick vehicles, such as the Buick LaCrosse eAssist or similar models equipped with hybrid battery systems.