AutoCodes – GMC – P1BC4 GMC

P1BC4 GMC Code - Hybrid/Electric Vehicle Battery 75 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: P1BC4 GMC indicates Hybrid/Electric Vehicle Battery 75 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 895

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 P1BC4 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 P1BC4 GMC - Hybrid/Electric Vehicle Battery 75 Circuit Low Voltage - AutoCodes.com — P1BC4 GMC Code - Hybrid/Electric Vehicle Battery 75 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1BC4 GMC?

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

How to Fix the DTC P1BC4 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 P1BC4 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 P1BC4 GMC Code

1. What are the common symptoms of OBDII code P1BC4 GMC related to the Hybrid/Electric Vehicle Battery 75 Circuit Low Voltage?

- Common symptoms include poor performance, reduced fuel efficiency, difficulty starting the vehicle, and dashboard warning lights related to the hybrid/electric system.

2. What are the potential causes of OBDII code P1BC4 GMC indicating Hybrid/Electric Vehicle Battery 75 Circuit Low Voltage?

- Causes can include a faulty hybrid/electric vehicle battery, issues with the battery management system, loose or corroded connections, or a problem with the charging system.

3. How serious is OBDII code P1BC4 GMC associated with Hybrid/Electric Vehicle Battery 75 Circuit Low Voltage?

- This code should be addressed promptly as it can affect the performance and drivability of the vehicle, potentially leading to further damage to the hybrid/electric system.

4. Can I continue driving my vehicle with OBDII code P1BC4 GMC indicating Hybrid/Electric Vehicle Battery 75 Circuit Low Voltage?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further issues and potential safety hazards.

5. How can I diagnose and repair OBDII code P1BC4 GMC related to Hybrid/Electric Vehicle Battery 75 Circuit Low Voltage?

- Diagnosing and repairing this code typically requires a professional scan tool to assess the hybrid/electric system, checking the battery and its connections, and testing the charging system components.

6. Are there any DIY tips for addressing OBDII code P1BC4 GMC for Hybrid/Electric Vehicle Battery 75 Circuit Low Voltage?

- DIY tips may include visually inspecting battery connections for corrosion or damage, ensuring the battery is securely connected, and checking for any visible signs of battery deterioration.

7. How much does it cost to fix OBDII code P1BC4 GMC regarding Hybrid/Electric Vehicle Battery 75 Circuit Low Voltage?

- The cost of fixing this code can vary depending on the underlying issue, but it may involve battery replacement, repairs to the charging system, or addressing other related components.

8. Can a regular mechanic repair OBDII code P1BC4 GMC for Hybrid/Electric Vehicle Battery 75 Circuit Low Voltage?

- It is recommended to consult a mechanic or technician with experience in hybrid/electric vehicle systems to properly diagnose and repair issues related to this specific code.

9. Will resetting the OBDII code P1BC4 GMC related to Hybrid/Electric Vehicle Battery 75 Circuit Low Voltage make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to return as the system detects the ongoing problem.

10. Is it possible to prevent OBDII code P1BC4 GMC indicating Hybrid/Electric Vehicle Battery 75 Circuit Low Voltage from occurring in the future?

- Regular maintenance of the hybrid/electric system, including battery checks and ensuring proper charging, can help prevent issues that lead to this code.