AutoCodes – GMC – P0B9A GMC

P0B9A GMC Code - Hybrid/Electric Vehicle Battery 20 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: P0B9A GMC indicates Hybrid/Electric Vehicle Battery 20 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 826

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 P0B9A GMC 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 P0B9A GMC - Hybrid/Electric Vehicle Battery 20 Circuit - AutoCodes.com — P0B9A GMC Code - Hybrid/Electric Vehicle Battery 20 Circuit

What does this mean?

What are the Possible Causes of the DTC P0B9A GMC?

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

How to Fix the DTC P0B9A GMC?

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 P0B9A GMC 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 P0B9A GMC Code

1. What does the OBDII code P0B9A mean on a GMC vehicle?

P0B9A indicates an issue with the Hybrid/Electric Vehicle Battery 20 Circuit, which refers to a malfunction in the battery's voltage sensor or related wiring for cell group 20.

2. What are the symptoms of code P0B9A in a GMC vehicle?

Common symptoms include the illumination of the check engine light or hybrid system warning light, reduced hybrid performance, decreased fuel efficiency, or the vehicle entering a "limp" mode.

3. What causes the P0B9A code to appear on a GMC vehicle?

Possible causes include a faulty battery voltage sensor, damaged or corroded wiring or connectors in the circuit, or an internal issue within the hybrid battery pack.

4. Can code P0B9A damage my GMC hybrid or electric vehicle?

While it may not immediately cause severe damage, ignoring the code can lead to decreased vehicle performance or stress on other hybrid system components.

5. How is the P0B9A code diagnosed in a GMC vehicle?

A technician will use a scan tool to confirm the code, inspect the battery voltage sensor, and check for damaged wiring, loose connections, or irregular voltage readings in the affected cell group.

6. Can I drive my GMC vehicle with the P0B9A code?

It is not recommended to drive for extended periods with this code active, as it can lead to reduced performance or additional issues with the hybrid system.

7. How do you fix the P0B9A code on a GMC vehicle?

Repairs may include replacing a faulty battery voltage sensor, repairing or replacing damaged wiring or connectors, or addressing internal issues in the hybrid battery pack.

8. Is the P0B9A code covered under warranty for GMC vehicles?

If your vehicle is still under the hybrid system or battery warranty, this issue may be covered. Check with your dealership for specific warranty details.

9. How much does it cost to fix the P0B9A code on a GMC vehicle?

Repair costs can vary, ranging from $200 to $1,500 or more, depending on whether the issue is a simple wiring repair or a more complex battery pack replacement.

10. Can a low auxiliary battery cause the P0B9A code on my GMC?

While unlikely, a weak or malfunctioning auxiliary battery can sometimes create voltage irregularities that contribute to hybrid system fault codes.