AutoCodes – Chevrolet – P0B9F Chevrolet

P0B9F Chevrolet Code - Hybrid/Electric Vehicle Battery 21 Circuit

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: P0B9F Chevrolet indicates Hybrid/Electric Vehicle Battery 21 Circuit.
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 916

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B9F 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 P0B9F Chevrolet - Hybrid/Electric Vehicle Battery 21 Circuit - AutoCodes.com — P0B9F Chevrolet Code - Hybrid/Electric Vehicle Battery 21 Circuit

What does this mean?

What are the Possible Causes of the DTC P0B9F Chevrolet?

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

How to Fix the DTC P0B9F 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 P0B9F 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 P0B9F Chevrolet Code

1. What does the OBDII code P0B9F mean on a Chevrolet?

P0B9F indicates an issue with the "Hybrid/Electric Vehicle Battery 21 Circuit," suggesting a problem with the specific circuit connected to the hybrid battery.

2. What are the common symptoms of code P0B9F in a Chevrolet?

Symptoms may include reduced fuel efficiency, limited hybrid system performance, warning lights on the dashboard, and potential loss of electric drive functionality.

3. What causes the P0B9F code to appear on a Chevrolet?

Common causes include a faulty battery sensor, damaged wiring or connectors in the circuit, or internal issues within the hybrid battery module.

4. Can I continue driving with the P0B9F code active?

It is not recommended to continue driving for long periods, as it may lead to further damage to the battery system or reduced vehicle performance.

5. How is the P0B9F code diagnosed on a Chevrolet?

A technician will use a scan tool to confirm the code, inspect the battery 21 circuit wiring and connections, and test the voltage and resistance of the affected components.

6. What repairs are needed to fix the P0B9F code on a Chevrolet?

Repairs may include replacing a faulty battery sensor, repairing or replacing damaged wiring, or addressing any internal battery module issues.

7. How much does it cost to fix the P0B9F code on a Chevrolet?

Repair costs can vary depending on the exact issue but may range from $100 for minor wiring repairs to over $1,000 for hybrid battery repairs or replacements.

8. Can a low hybrid battery charge trigger the P0B9F code?

No, this code typically points to a circuit or sensor issue rather than the battery's state of charge.

9. Will clearing the P0B9F code fix the problem?

Clearing the code without addressing the underlying issue will only temporarily remove the warning, and the code is likely to return.

10. Is the P0B9F code covered under warranty for Chevrolet hybrid vehicles?

Depending on the age and mileage of your vehicle, the hybrid battery and related components may still be under warranty. Check your warranty terms for coverage details.