AutoCodes – Chevrolet – P1BA9 Chevrolet

P1BA9 Chevrolet 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 Chevrolet 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 1,214

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

What does this mean?

What are the Possible Causes of the DTC P1BA9 Chevrolet?

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

How to Fix the DTC P1BA9 Chevrolet?

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 Chevrolet 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 Chevrolet Code

1. What are common symptoms of OBDII code P1BA9 in a Chevrolet hybrid/electric vehicle?

- Common symptoms include poor fuel economy, loss of power, and a noticeable decrease in overall performance.

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

- Possible causes include a faulty battery pack, damaged battery cells, issues with the battery management system, or a wiring problem.

3. How serious is the P1BA9 code in a Chevrolet hybrid/electric vehicle?

- This code indicates a low voltage issue with the hybrid/electric vehicle battery, which can affect the vehicle's performance and overall driveability. It is important to address this issue promptly.

4. Can driving with the P1BA9 code present cause further damage to the vehicle?

- Continuing to drive with the P1BA9 code present can potentially lead to further damage to the battery system and other related components. It is recommended to address the issue as soon as possible.

5. What are some DIY repair tips for resolving the P1BA9 code in a Chevrolet hybrid/electric vehicle?

- DIY repair tips include checking the battery connections, inspecting for any visible damage to the battery pack, and ensuring proper charging of the hybrid/electric vehicle battery.

6. Is it safe to reset the OBDII code P1BA9 in a Chevrolet without addressing the underlying issue?

- It is not recommended to simply reset the code without investigating and resolving the root cause, as the issue may persist and potentially lead to more severe problems in the future.

7. How can a professional mechanic diagnose the P1BA9 code in a Chevrolet hybrid/electric vehicle?

- A professional mechanic can use specialized diagnostic equipment to analyze the hybrid/electric vehicle battery system, check for voltage irregularities, and perform a thorough inspection of the components.

8. What is the typical cost to repair the Hybrid/Electric Vehicle Battery 66 Circuit Low Voltage code (P1BA9) in a Chevrolet?

- The cost of repair can vary depending on the specific cause of the issue, but it may involve replacing damaged battery components, addressing wiring issues, or reprogramming the battery management system. Costs can range from a few hundred to several thousand dollars.

9. Are there any recalls or technical service bulletins related to the P1BA9 code in Chevrolet hybrid/electric vehicles?

- It is recommended to check with Chevrolet dealerships or online resources for any recalls or technical service bulletins related to the P1BA9 code in specific Chevrolet hybrid/electric vehicle models.