AutoCodes – Buick – P1BAA Buick

P1BAA Buick Code - Hybrid/Electric Vehicle Battery 66 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: P1BAA Buick indicates Hybrid/Electric Vehicle Battery 66 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 834

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 P1BAA 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 P1BAA Buick - Hybrid/Electric Vehicle Battery 66 Circuit High Voltage - AutoCodes.com — P1BAA Buick Code - Hybrid/Electric Vehicle Battery 66 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1BAA Buick?

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

How to Fix the DTC P1BAA 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 P1BAA 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 P1BAA Buick Code

1. What does the OBDII code P1BAA mean on a Buick?

Code P1BAA indicates a problem with the Hybrid/Electric Vehicle Battery 66 Circuit High Voltage, typically related to the voltage sensor or wiring within the hybrid battery system.

2. What are the common symptoms of a P1BAA code in a Buick?

Symptoms may include the check engine light turning on, reduced fuel efficiency, limited hybrid system performance, or a warning message related to the hybrid battery system.

3. What causes the P1BAA code to trigger in a Buick?

The code is often caused by a faulty voltage sensor, damaged wiring or connectors, corrosion in the high-voltage circuit, or an issue with the hybrid battery control module.

4. Can I drive my Buick with a P1BAA code?

While the vehicle may still be drivable, it is not recommended, as the code indicates an issue in the hybrid battery system that could worsen or lead to further damage.

5. How is the P1BAA code diagnosed in a Buick?

A technician will use a diagnostic scanner to confirm the code, inspect the hybrid battery wiring and connections, test the voltage sensor, and check for other related codes.

6. What is the typical repair for a P1BAA code in a Buick?

Repairs may include replacing a faulty voltage sensor, repairing damaged wiring, cleaning corroded connections, or reprogramming or replacing the hybrid battery control module.

7. How much does it cost to fix a P1BAA code on a Buick?

Repair costs can vary widely but typically range from $200 to $1,500, depending on whether wiring repairs, sensor replacement, or hybrid battery module service is needed.

8. Can a P1BAA code clear itself on a Buick?

The code is unlikely to clear itself unless the underlying issue is resolved. A manual reset may be needed after repairs are completed.

9. What tools are needed to troubleshoot a P1BAA code in a Buick?

A diagnostic scanner capable of reading hybrid system codes, a multimeter for testing voltage, and access to the vehicleâ€™s wiring diagram are essential for troubleshooting.

10. Is the P1BAA code specific to Buick vehicles?

No, the P1BAA code can appear on other vehicles with hybrid or electric systems, but its meaning and diagnostic steps may vary by manufacturer.