AutoCodes – Buick – P1B9B Buick

P1B9B Buick Code - Hybrid/Electric Vehicle Battery 61 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: P1B9B Buick indicates Hybrid/Electric Vehicle Battery 61 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 983

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 P1B9B 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 P1B9B Buick - Hybrid/Electric Vehicle Battery 61 Circuit High Voltage - AutoCodes.com — P1B9B Buick Code - Hybrid/Electric Vehicle Battery 61 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B9B Buick?

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

How to Fix the DTC P1B9B 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 P1B9B 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 P1B9B Buick Code

What does the OBDII code P1B9B mean for a Buick?

Code P1B9B indicates a high voltage issue in the Hybrid/Electric Vehicle Battery 61 Circuit, which typically relates to the battery's electrical system.

What are the symptoms of code P1B9B in a Buick?

Symptoms may include warning lights on the dashboard, reduced hybrid or electric system performance, difficulty starting the vehicle, or impaired fuel efficiency.

What causes the P1B9B code in a Buick?

This code can be caused by wiring issues, a faulty battery cell or module, damaged connectors, or problems with the battery management system.

Can I drive my Buick with the P1B9B code active?

Itâ€™s not recommended to drive the vehicle with this code active, as it may cause further damage to the hybrid system or result in reduced performance.

How is the P1B9B code diagnosed?

A mechanic will use a diagnostic scanner to confirm the code and inspect the battery, wiring, connectors, and other related components for faults.

How do you fix the P1B9B code in a Buick?

Repairs may include replacing damaged wiring, connectors, or battery modules, and resetting the system using a diagnostic tool.

Is the P1B9B code specific to Buick hybrid vehicles?

While the code is common in Buick hybrid/electric vehicles, other manufacturers may use similar codes for high voltage battery circuit issues.

How much does it cost to fix the P1B9B code on a Buick?

Repair costs vary depending on the issue, ranging from $100 for wiring repairs to thousands for battery module replacement.

Can the P1B9B code be cleared without repairs?

The code can be cleared temporarily with a diagnostic tool, but it will likely return if the underlying issue is not resolved.

What preventative steps can I take to avoid the P1B9B code?

Regular maintenance of the hybrid battery system, inspecting wiring and connectors, and avoiding extreme temperature exposure can help prevent this issue.