AutoCodes – Buick – P1B9D Buick

P1B9D Buick Code - Hybrid/Electric Vehicle Battery 62 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: P1B9D Buick indicates Hybrid/Electric Vehicle Battery 62 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 927

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 P1B9D 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 P1B9D Buick - Hybrid/Electric Vehicle Battery 62 Circuit Low Voltage - AutoCodes.com — P1B9D Buick Code - Hybrid/Electric Vehicle Battery 62 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B9D Buick?

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

How to Fix the DTC P1B9D 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 P1B9D 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 P1B9D Buick Code

1. What are common symptoms of OBDII code P1B9D in a Buick hybrid/electric vehicle?

- Common symptoms include reduced battery performance, difficulty starting the vehicle, and potential warning lights on the dashboard related to the hybrid/electric system.

2. What are possible causes of OBDII code P1B9D in a Buick hybrid/electric vehicle?

- Possible causes include a malfunctioning hybrid/electric vehicle battery, issues with the battery management system, faulty wiring or connections, or a defective battery temperature sensor.

3. How can I diagnose the OBDII code P1B9D in my Buick hybrid/electric vehicle?

- Diagnosis typically involves using a professional OBDII scanner to retrieve the specific code, checking the battery voltage levels, inspecting the battery connections, and testing the battery management system components.

4. Is it safe to continue driving with OBDII code P1B9D present in my Buick hybrid/electric vehicle?

- It is not recommended to continue driving with this code present, as it can lead to further damage to the hybrid/electric system and potentially leave you stranded if the battery fails completely.

5. Can I repair OBDII code P1B9D in my Buick hybrid/electric vehicle myself?

- While some basic troubleshooting and checks can be done by a DIY enthusiast, it is recommended to seek professional help for diagnosing and repairing issues related to the hybrid/electric system to ensure proper safety and functionality.

6. What are some general repair tips for addressing OBDII code P1B9D in a Buick hybrid/electric vehicle?

- Repair tips may include checking and cleaning battery terminals, inspecting for any visible wiring damage, testing the battery for proper voltage levels, and consulting with a certified technician for further diagnosis and repair.

7. How much does it typically cost to repair OBDII code P1B9D in a Buick hybrid/electric vehicle?

- Repair costs can vary depending on the exact cause of the issue, but they may range from a few hundred to a few thousand dollars, especially if components like the battery need to be replaced.

8. Are there any recalls or technical service bulletins related to OBDII code P1B9D in Buick hybrid/electric vehicles?

- It is advisable to check with the manufacturer or a certified dealership for any existing recalls or technical service bulletins related to this specific OBDII code to see if your vehicle may be eligible for free repairs or assistance.

9. How can I prevent OBDII code P1B9D from recurring in my Buick hybrid/electric vehicle?

- Regular maintenance of the hybrid/electric system, including checking battery health, keeping connections clean and secure, and addressing any warning lights promptly, can help prevent the recurrence of this code.

10. Can OBDII code P1B9D in a Buick hybrid/electric vehicle affect the overall performance and efficiency of the vehicle?

- Yes, this code can impact the overall performance and efficiency of the vehicle by causing issues with the hybrid/electric system, potentially leading to decreased fuel economy and drivability problems.