AutoCodes – Buick – P1BA1 Buick

P1BA1 Buick Code - Hybrid/Electric Vehicle Battery 63 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: P1BA1 Buick indicates Hybrid/Electric Vehicle Battery 63 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 853

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 P1BA1 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 P1BA1 Buick - Hybrid/Electric Vehicle Battery 63 Circuit High Voltage - AutoCodes.com — P1BA1 Buick Code - Hybrid/Electric Vehicle Battery 63 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1BA1 Buick?

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

How to Fix the DTC P1BA1 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 P1BA1 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 P1BA1 Buick Code

1. What does the OBDII code P1BA1 mean for a Buick?

P1BA1 indicates an issue with the Hybrid/Electric Vehicle Battery 63 Circuit, where the system has detected abnormally high voltage.

2. What are common symptoms of the P1BA1 code in a Buick?

Symptoms may include illuminated check engine or hybrid system warning lights, reduced fuel efficiency, limited hybrid system performance, or difficulty in starting the vehicle.

3. What causes the P1BA1 code to appear in a Buick?

The code can be caused by damaged battery cells, loose or corroded electrical connections, a faulty battery sensor module, or issues with the battery control module.

4. Can I drive my Buick with the P1BA1 code?

It is not recommended to drive with this code, as it may lead to further damage to the hybrid battery system or reduced vehicle performance.

5. How is the P1BA1 code diagnosed?

A technician will use a scan tool to read the code and inspect the high-voltage battery system, including wiring, connectors, and the battery control module.

6. What repairs can fix the P1BA1 code in a Buick?

Repairs may include replacing damaged battery cells, repairing or replacing wiring and connectors, or replacing the battery sensor or control module.

7. How much does it cost to fix the P1BA1 code in a Buick?

Repair costs vary depending on the issue, but fixing a hybrid battery problem can range from a few hundred to several thousand dollars if the battery needs replacement.

8. Can a weak 12V battery cause the P1BA1 code?

While unlikely, a weak 12V battery can sometimes cause communication errors, so it should be tested as part of the diagnosis.

9. Is the P1BA1 code specific to Buick hybrid vehicles?

Yes, this code is specific to Buick hybrid or electric vehicles equipped with a high-voltage battery system.

10. How can I prevent the P1BA1 code from occurring?

Regular maintenance, ensuring proper battery cooling, and addressing any warning lights promptly can help prevent issues with the high-voltage battery system.