AutoCodes – Chevrolet – P1BB9 Chevrolet

P1BB9 Chevrolet Code - Hybrid/Electric Vehicle Battery 71 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: P1BB9 Chevrolet indicates Hybrid/Electric Vehicle Battery 71 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 947

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 P1BB9 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 P1BB9 Chevrolet - Hybrid/Electric Vehicle Battery 71 Circuit High Voltage - AutoCodes.com — P1BB9 Chevrolet Code - Hybrid/Electric Vehicle Battery 71 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1BB9 Chevrolet?

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

How to Fix the DTC P1BB9 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 P1BB9 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 P1BB9 Chevrolet Code

1. What are common symptoms of OBDII code P1BB9 in a Chevrolet hybrid/electric vehicle?

- Common symptoms include the check engine light illuminating, reduced power or acceleration, and potential drivability issues.

2. What does the OBDII code P1BB9 Chevrolet indicate about the Hybrid/Electric Vehicle Battery 71 Circuit High Voltage?

- This code indicates that there is a high voltage condition detected in the Hybrid/Electric Vehicle Battery 71 circuit.

3. What are possible causes of the OBDII code P1BB9 in a Chevrolet hybrid/electric vehicle?

- Possible causes include a faulty high voltage battery module, issues with the battery management system, and wiring or connection problems.

4. How can I diagnose the OBDII code P1BB9 in a Chevrolet hybrid/electric vehicle?

- Diagnosing this code typically involves using a professional OBDII scanner to retrieve the code and inspecting the high voltage battery components for any visible damage or issues.

5. Can I continue driving my Chevrolet hybrid/electric vehicle with the OBDII code P1BB9 present?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the high voltage battery system.

6. How can I repair the OBDII code P1BB9 in my Chevrolet hybrid/electric vehicle?

- Repairing this code may involve replacing the faulty high voltage battery module, addressing any issues with the battery management system, and ensuring all wiring connections are secure.

7. Should I attempt to repair the OBDII code P1BB9 in my Chevrolet hybrid/electric vehicle myself?

- Due to the high voltage nature of the components involved, it is recommended to have this code diagnosed and repaired by a qualified technician or electric vehicle specialist.

8. How much does it typically cost to repair the OBDII code P1BB9 in a Chevrolet hybrid/electric vehicle?

- The cost of repairing this code can vary depending on the extent of the issue, but it may involve a few hundred to a few thousand dollars in parts and labor.

9. Are there any preventive maintenance tips to avoid the OBDII code P1BB9 in a Chevrolet hybrid/electric vehicle?

- To help prevent this code, it is advisable to follow the manufacturer's recommended maintenance schedule for the high voltage battery system and have it inspected regularly by a professional.

10. Can the OBDII code P1BB9 in a Chevrolet hybrid/electric vehicle cause any safety concerns?

- Yes, this code can lead to safety concerns due to the high voltage nature of the hybrid/electric vehicle system, so it is important to address the issue promptly to avoid any potential hazards.