AutoCodes – Buick – P1B6B Buick

P1B6B Buick Code - Hybrid/Electric Vehicle Battery 45 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: P1B6B Buick indicates Hybrid/Electric Vehicle Battery 45 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 969

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 P1B6B 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 P1B6B Buick - Hybrid/Electric Vehicle Battery 45 Circuit High Voltage - AutoCodes.com — P1B6B Buick Code - Hybrid/Electric Vehicle Battery 45 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B6B Buick?

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

How to Fix the DTC P1B6B 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 P1B6B 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 P1B6B Buick Code

1. What does the OBDII code P1B6B mean on a Buick?

P1B6B indicates an issue with the high voltage circuit in the hybrid or electric vehicle battery, specifically related to Battery 45.

2. What are the common symptoms of P1B6B on a Buick?

Symptoms may include the check engine light turning on, reduced hybrid or electric vehicle performance, decreased fuel efficiency, or the vehicle failing to start.

3. What causes the P1B6B code to trigger?

The code is typically caused by a fault in the high voltage circuit, such as a damaged wiring harness, connector issues, or a malfunctioning battery module.

4. Can I drive my Buick with a P1B6B code?

It's not recommended to drive with this code active as it may lead to further damage to the hybrid or electric system and could compromise vehicle safety.

5. How do I diagnose the P1B6B code on a Buick?

A professional technician will use a scan tool to read the code, inspect the high voltage circuit wiring and connectors, and perform tests on the battery module to pinpoint the issue.

6. What repairs are commonly needed for a P1B6B code?

Repairs may include replacing damaged wiring, repairing connectors, or replacing the affected high voltage battery module.

7. How much does it cost to fix a P1B6B code on a Buick?

Repair costs vary, but they can range from $200 for minor wiring repairs to over $1,000 if a battery module replacement is necessary.

8. Can a P1B6B code be cleared without repairs?

Clearing the code without addressing the issue will likely result in the code returning, as the underlying problem remains unresolved.

9. Is the P1B6B code covered under warranty for Buick vehicles?

Depending on your vehicle's warranty, hybrid or electric system issues like P1B6B may be covered under the manufacturerâ€™s powertrain or hybrid system warranty.

10. How can I prevent the P1B6B code from occurring again?

Regular maintenance of the hybrid or electric system, including inspections of high voltage connections and components, can help prevent this issue.