AutoCodes – Generic – P1BA9

P1BA9 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 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 2,595

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

What does this mean?

What are the Possible Causes of the DTC P1BA9?

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

How to Fix the DTC P1BA9?

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 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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Need Help with the Code?

Get the P1BA9 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1BA9 Buick — Hybrid/Electric Vehicle Battery 66 Circuit Low Voltage
P1BA9 Cadillac — Hybrid/Electric Vehicle Battery 66 Circuit Low Voltage
P1BA9 Chevrolet — Hybrid/Electric Vehicle Battery 66 Circuit Low Voltage
P1BA9 GMC — Hybrid/Electric Vehicle Battery 66 Circuit Low Voltage
P1BA9 Saturn — Hybrid/Electric Vehicle Battery 66 Circuit Low Voltage

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 Code

1. What are the common symptoms of OBDII code P1BA9 (Hybrid/Electric Vehicle Battery 66 Circuit Low Voltage)?

- Common symptoms include reduced hybrid system performance, decreased fuel efficiency, and potential issues with the vehicle's battery charging.

2. What are some possible causes of OBDII code P1BA9?

- Possible causes include a faulty hybrid/electric vehicle battery, issues with the battery management system, wiring problems, or a malfunctioning battery control module.

3. How can I diagnose the cause of OBDII code P1BA9?

- Diagnosing the cause of this code typically involves conducting a thorough inspection of the hybrid/electric vehicle battery, checking for any visible damage to wiring or connections, and using a diagnostic scan tool to analyze system data.

4. Can I continue driving my vehicle with OBDII code P1BA9 present?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the hybrid/electric vehicle system and potentially affect the vehicle's performance and safety.

5. What are some repair tips for addressing OBDII code P1BA9?

- Repair tips may include checking and repairing any damaged wiring or connections, replacing the hybrid/electric vehicle battery if necessary, resetting the battery control module, and ensuring proper charging system operation.

6. How much does it typically cost to repair OBDII code P1BA9?

- The cost of repairing this code can vary depending on the specific cause of the issue, the extent of the repairs needed, and whether any parts need to be replaced. It is recommended to consult with a qualified mechanic for an accurate cost estimate.

7. Can OBDII code P1BA9 be triggered by a temporary issue?

- Yes, in some cases, this code may be triggered by a temporary issue such as a momentary drop in voltage. However, it is important to address the underlying cause to prevent further issues.

8. What should I do if OBDII code P1BA9 keeps coming back after repairs?

- If this code keeps coming back after repairs, it may indicate an ongoing issue with the hybrid/electric vehicle system. It is recommended to have the vehicle thoroughly inspected by a professional to determine the root cause.

9. Are there any preventive measures to avoid OBDII code P1BA9 in the future?

- Regular maintenance of the hybrid/electric vehicle system, including checking the battery and charging system, can help prevent issues that may lead to OBDII code P1BA9. Following manufacturer recommendations for maintenance is crucial.

10. Can OBDII code P1BA9 cause permanent damage to the vehicle?

- If left unaddressed, OBDII code P1BA9 can potentially cause permanent damage to the hybrid/electric vehicle system, leading to more extensive and costly repairs. It is important to address this code promptly to prevent further damage.