AutoCodes – GMC – P0B9C GMC

P0B9C GMC Code - Hybrid/Electric Vehicle Battery 20 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: P0B9C GMC indicates Hybrid/Electric Vehicle Battery 20 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 1,061

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 P0B9C 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 P0B9C GMC - Hybrid/Electric Vehicle Battery 20 Circuit Low Voltage - AutoCodes.com — P0B9C GMC Code - Hybrid/Electric Vehicle Battery 20 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0B9C GMC?

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

How to Fix the DTC P0B9C 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 P0B9C 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 P0B9C GMC Code

1. What are the common symptoms of OBDII code P0B9C GMC (Hybrid/Electric Vehicle Battery 20 Circuit Low Voltage)?

The common symptoms include reduced hybrid system performance, difficulty starting the vehicle, and potential illumination of the hybrid system warning light.

2. What are some possible causes of OBDII code P0B9C GMC?

Possible causes include a malfunctioning hybrid battery, issues with the high voltage circuit, loose electrical connections, or a faulty battery management system.

3. How can I diagnose the root cause of OBDII code P0B9C GMC?

Diagnosing this code typically requires specialized diagnostic equipment to analyze the hybrid battery system, high voltage circuits, and related components. It is recommended to consult a professional technician for an accurate diagnosis.

4. Can I continue driving my vehicle with OBDII code P0B9C GMC?

It is not advisable to continue driving the vehicle with this code present, as it can lead to further damage to the hybrid/electric system. It is recommended to have the issue addressed promptly.

5. What are some repair tips for fixing OBDII code P0B9C GMC?

Repairing this code may involve inspecting and repairing any damaged wiring, replacing the hybrid battery if necessary, checking and resetting the battery management system, and ensuring proper connections in the high voltage circuit.

6. How much does it typically cost to repair OBDII code P0B9C GMC?

The cost of repairing this code can vary depending on the specific underlying issue, the extent of the damage, and the labor rates of the repair facility. It is recommended to obtain estimates from qualified technicians.

7. Can a DIY enthusiast attempt to fix OBDII code P0B9C GMC?

Due to the complexity of hybrid/electric vehicle systems and the high voltage components involved, it is not recommended for DIY enthusiasts to attempt repairs for this code. Professional expertise is advised.

8. How often does OBDII code P0B9C GMC occur in hybrid/electric vehicles?

This particular OBDII code related to the Hybrid/Electric Vehicle Battery 20 Circuit Low Voltage may occur infrequently, but it is crucial to address it promptly to prevent further complications in the vehicle's hybrid system.

9. Are there any preventive measures to avoid OBDII code P0B9C GMC?

Regular maintenance of the hybrid/electric vehicle system, including checking the battery health, monitoring high voltage components, and addressing any warning lights promptly, can help prevent issues leading to this OBDII code.

10. Is it safe to reset the OBDII code P0B9C GMC using a diagnostic tool?

Resetting the code using a diagnostic tool may clear the warning light temporarily, but it is essential to address the underlying issue causing the code to prevent further damage to the vehicle's hybrid system.