AutoCodes – GMC – P1BC1 GMC

P1BC1 GMC Code - Hybrid/Electric Vehicle Battery 74 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: P1BC1 GMC indicates Hybrid/Electric Vehicle Battery 74 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 888

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 P1BC1 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 P1BC1 GMC - Hybrid/Electric Vehicle Battery 74 Circuit Low Voltage - AutoCodes.com — P1BC1 GMC Code - Hybrid/Electric Vehicle Battery 74 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1BC1 GMC?

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

How to Fix the DTC P1BC1 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 P1BC1 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 P1BC1 GMC Code

1. What are the common symptoms of OBDII code P1BC1 GMC (Hybrid/Electric Vehicle Battery 74 Circuit Low Voltage)?

- Common symptoms include reduced vehicle performance, difficulty starting the vehicle, and warning lights illuminated on the dashboard related to the battery system.

2. What can cause the OBDII code P1BC1 GMC to trigger?

- This code can be triggered by issues such as a weak or failing hybrid/electric vehicle battery, faulty battery management system, loose connections, or corrosion on the battery terminals.

3. How can I diagnose the cause of OBDII code P1BC1 GMC?

- Diagnosing the code involves using a scan tool to retrieve the specific fault codes, testing the hybrid/electric vehicle battery voltage levels, inspecting battery connections for corrosion or damage, and checking the battery management system for faults.

4. Can driving with the OBDII code P1BC1 GMC present cause further damage to the vehicle?

- Continuing to drive with this code present can potentially cause damage to other electrical components or result in complete battery failure, leading to a loss of power and drivability.

5. How can I reset the OBDII code P1BC1 GMC after making repairs?

- After addressing the underlying issue causing the code, the code can be reset using an OBDII scan tool capable of clearing fault codes, or by disconnecting the vehicle's battery for a few minutes.

6. Are there any DIY repair tips for fixing OBDII code P1BC1 GMC?

- DIY repair tips include checking and cleaning battery terminals, ensuring secure connections, testing the battery voltage, and inspecting the battery management system wiring for any visible damage.

7. Is it safe to drive a vehicle with the OBDII code P1BC1 GMC temporarily until repairs can be made?

- It is not recommended to drive the vehicle with this code present for an extended period, as it can lead to further damage and potential safety risks. It is best to address the issue promptly.

8. How much does it typically cost to repair OBDII code P1BC1 GMC at a professional auto repair shop?

- Repair costs can vary depending on the underlying issue, but expect to pay anywhere from $200 to $800 or more for repairs related to the hybrid/electric vehicle battery system.

9. Can extreme weather conditions affect the likelihood of triggering OBDII code P1BC1 GMC?

- Yes, extreme hot or cold weather can impact the performance of the hybrid/electric vehicle battery, potentially leading to low voltage issues and triggering the OBDII code.

10. Will OBDII code P1BC1 GMC cause the vehicle to fail an emissions test?

- Yes, this code may cause the vehicle to fail an emissions test due to the impact on the battery system and its related emissions control functions.