AutoCodes – Buick – P1BA9 Buick

P1BA9 Buick Code - Hybrid/Electric Vehicle Battery 66 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: P1BA9 Buick indicates Hybrid/Electric Vehicle Battery 66 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 1,045

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 P1BA9 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 P1BA9 Buick - Hybrid/Electric Vehicle Battery 66 Circuit Low Voltage - AutoCodes.com — P1BA9 Buick Code - Hybrid/Electric Vehicle Battery 66 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1BA9 Buick?

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

How to Fix the DTC P1BA9 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 P1BA9 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 P1BA9 Buick Code

1. What are the common symptoms of OBDII code P1BA9 in a Buick Hybrid/Electric Vehicle?

- Common symptoms include loss of power, reduced fuel efficiency, and potential battery-related warning lights on the dashboard.

2. What can cause the Hybrid/Electric Vehicle Battery 66 Circuit Low Voltage code (P1BA9) in a Buick?

- The code can be triggered by issues such as a faulty battery pack, damaged wiring, poor battery connections, or a failing battery management system.

3. How serious is the P1BA9 code in a Buick Hybrid/Electric Vehicle?

- The code indicates a low voltage issue in the hybrid/electric vehicle battery circuit, which can impact the vehicle's performance and efficiency. It is important to address this issue promptly.

4. Can I continue driving my Buick with the P1BA9 error code?

- It is not recommended to drive the vehicle with the P1BA9 code present, as it can lead to further damage to the battery system and potentially leave you stranded.

5. How can I diagnose and repair the P1BA9 code in my Buick Hybrid/Electric Vehicle?

- Diagnosis typically involves inspecting the battery pack, checking the wiring and connections, and testing the battery management system with specialized tools. Repair may involve replacing damaged components or addressing wiring issues.

6. Is it possible to reset the P1BA9 code in a Buick without fixing the underlying issue?

- While clearing the code temporarily may be possible, it is crucial to address the root cause of the low voltage issue to prevent further problems and ensure the vehicle's proper operation.

7. Are there any DIY tips for troubleshooting the P1BA9 code in a Buick Hybrid/Electric Vehicle?

- DIY enthusiasts can start by inspecting the battery connections for tightness, checking for visible damage to wiring, and ensuring the battery pack is securely in place. However, complex diagnosis and repair may require professional assistance.

8. How much does it typically cost to fix the P1BA9 code in a Buick Hybrid/Electric Vehicle?

- The cost of fixing the P1BA9 code can vary depending on the underlying issue, parts needed for repair, and labor rates. It is advisable to obtain quotes from reputable auto repair shops for an accurate estimate.

9. Can a regular mechanic repair the P1BA9 code in a Buick Hybrid/Electric Vehicle, or is specialized expertise required?

- Due to the complex nature of hybrid/electric vehicle systems, it is recommended to seek assistance from a mechanic with experience in servicing these types of vehicles to diagnose and repair the P1BA9 code accurately.

10. How often does the P1BA9 code occur in Buick Hybrid/Electric Vehicles, and is it a common issue?

- While the P1BA9 code specifically relates to a low voltage condition in the Hybrid/Electric Vehicle Battery 66 Circuit, occurrences can vary. Proper maintenance and timely diagnosis can help prevent this issue from arising frequently.