AutoCodes – GMC – P1BC9 GMC

P1BC9 GMC Code - Hybrid/Electric Vehicle Battery 77 Circuit Performance

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: P1BC9 GMC indicates Hybrid/Electric Vehicle Battery 77 Circuit Performance.
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 714

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 P1BC9 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 P1BC9 GMC - Hybrid/Electric Vehicle Battery 77 Circuit Performance - AutoCodes.com — P1BC9 GMC Code - Hybrid/Electric Vehicle Battery 77 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1BC9 GMC?

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

How to Fix the DTC P1BC9 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 P1BC9 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 P1BC9 GMC Code

1. What are the common symptoms of OBDII code P1BC9 GMC related to Hybrid/Electric Vehicle Battery 77 Circuit Performance?

The common symptoms include reduced electric vehicle range, difficulty starting the vehicle, and a noticeable decrease in hybrid system performance.

2. What are the possible causes of OBDII code P1BC9 GMC indicating Hybrid/Electric Vehicle Battery 77 Circuit Performance?

Possible causes include a faulty hybrid/electric vehicle battery, damaged battery cables or wiring, software glitches, or issues with the battery management system.

3. How can I diagnose the issue related to OBDII code P1BC9 GMC for Hybrid/Electric Vehicle Battery 77 Circuit Performance?

Diagnosing the issue may involve conducting a thorough inspection of the hybrid/electric vehicle battery, checking the battery connections, using a scan tool to monitor battery performance data, and performing a battery load test.

4. Can I continue driving my vehicle with OBDII code P1BC9 GMC indicating Hybrid/Electric Vehicle Battery 77 Circuit Performance?

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

5. How can I repair OBDII code P1BC9 GMC for Hybrid/Electric Vehicle Battery 77 Circuit Performance?

Repairing this code may involve replacing the faulty hybrid/electric vehicle battery, repairing or replacing damaged wiring or connections, updating software as needed, and resetting the battery management system.

6. Is it safe to attempt repairs related to OBDII code P1BC9 GMC for Hybrid/Electric Vehicle Battery 77 Circuit Performance on my own?

Repairing issues related to hybrid/electric vehicle batteries can be complex and dangerous due to high voltage systems. It is recommended to seek professional assistance or consult a certified technician for repairs.

7. Can a low battery state of charge trigger OBDII code P1BC9 GMC for Hybrid/Electric Vehicle Battery 77 Circuit Performance?

Yes, a low battery state of charge can trigger this code as it may indicate a problem with the battery's ability to maintain a sufficient charge or deliver power effectively.

8. How often should I have the hybrid/electric vehicle battery system inspected to prevent OBDII code P1BC9 GMC related issues?

Regular inspections of the hybrid/electric vehicle battery system are recommended as part of routine maintenance, typically during scheduled service intervals or whenever any symptoms of battery-related issues arise.

9. Are there any specific driving habits or practices that can help prevent OBDII code P1BC9 GMC for Hybrid/Electric Vehicle Battery 77 Circuit Performance?

Maintaining proper charging habits, avoiding deep discharges of the battery, driving the vehicle regularly, and following manufacturer-recommended maintenance schedules can help prevent issues related to this OBDII code.

10. How can I reset the OBDII code P1BC9 GMC for Hybrid/Electric Vehicle Battery 77 Circuit Performance after repairs have been made?

After repairing the underlying issue, the OBDII code can be reset using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes to clear the error code from the system.