AutoCodes – Buick – P1B9A Buick

P1B9A Buick Code - Hybrid/Electric Vehicle Battery 61 Circuit Low 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: P1B9A Buick indicates Hybrid/Electric Vehicle Battery 61 Circuit Low 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 873

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 P1B9A 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 P1B9A Buick - Hybrid/Electric Vehicle Battery 61 Circuit Low Voltage - AutoCodes.com — P1B9A Buick Code - Hybrid/Electric Vehicle Battery 61 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B9A Buick?

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

How to Fix the DTC P1B9A 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 P1B9A 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 P1B9A Buick Code

1. What are the common symptoms of OBDII code P1B9A in a Buick hybrid/electric vehicle?

- Common symptoms include poor fuel efficiency, reduced power output, and potential issues with starting the vehicle.

2. What are the possible causes of OBDII code P1B9A indicating Hybrid/Electric Vehicle Battery 61 Circuit Low Voltage in a Buick?

- The code may be triggered by a failing hybrid/electric vehicle battery, damaged battery cells, loose electrical connections, or a faulty battery management system.

3. How can I diagnose the Hybrid/Electric Vehicle Battery 61 Circuit Low Voltage issue in my Buick?

- A professional diagnostic scan tool can be used to retrieve the specific fault codes and pinpoint the exact cause of the low voltage issue in the hybrid/electric vehicle battery system.

4. Can I continue driving my Buick with the P1B9A code present?

- It is not recommended to drive the vehicle with the code present as it can lead to further damage to the hybrid/electric vehicle battery system and potentially cause safety hazards.

5. Are there any temporary fixes for OBDII code P1B9A in a Buick hybrid/electric vehicle?

- Temporary fixes such as resetting the battery system by disconnecting the negative terminal for a few minutes may clear the code, but it's important to address the underlying issue for a permanent solution.

6. How do I repair the Hybrid/Electric Vehicle Battery 61 Circuit Low Voltage issue in my Buick?

- Repair options may include replacing the hybrid/electric vehicle battery, repairing damaged battery cells, securing loose electrical connections, or recalibrating the battery management system.

7. Is it safe to attempt repairs on the hybrid/electric vehicle battery system myself?

- Due to the high voltage nature of hybrid/electric vehicle batteries, it is recommended to have repairs and maintenance performed by qualified professionals with experience in handling such systems.

8. How much does it typically cost to repair OBDII code P1B9A in a Buick hybrid/electric vehicle?

- The cost of repairs can vary depending on the specific issue causing the low voltage fault, but it's important to budget for potential battery replacements or system recalibrations.

9. Will resetting the OBDII code P1B9A on my Buick make it go away permanently?

- Resetting the code may clear it temporarily, but if the underlying issue causing the low voltage fault is not addressed, the code is likely to reappear.

10. Can OBDII code P1B9A in a Buick hybrid/electric vehicle affect the vehicle's overall performance?

- Yes, the low voltage issue indicated by the code can impact the vehicle's performance, fuel efficiency, and overall driving experience, making it important to address promptly.