AutoCodes – GMC – P1B4C GMC

P1B4C GMC Code - Hybrid/Electric Vehicle Battery 35 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: P1B4C GMC indicates Hybrid/Electric Vehicle Battery 35 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 832

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 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B4C 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 P1B4C GMC - Hybrid/Electric Vehicle Battery 35 Circuit Low Voltage - AutoCodes.com — P1B4C GMC Code - Hybrid/Electric Vehicle Battery 35 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B4C GMC?

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

How to Fix the DTC P1B4C 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 P1B4C 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 P1B4C GMC Code

1. What are common symptoms of OBDII code P1B4C GMC (Hybrid/Electric Vehicle Battery 35 Circuit Low Voltage)?

- Common symptoms include reduced electric vehicle range, difficulty starting the vehicle, and warning lights illuminated on the dashboard related to the hybrid/electric system.

2. What are the possible causes of OBDII code P1B4C GMC?

- The code P1B4C GMC can be triggered by issues such as a weak or failing hybrid/electric vehicle battery, a malfunctioning battery management system, poor electrical connections, or a faulty high-voltage circuit.

3. How can I diagnose the cause of OBDII code P1B4C GMC?

- A thorough diagnostic scan using an OBDII scanner is recommended to pinpoint the exact cause of the code. Additionally, a visual inspection of the high-voltage circuit components and the battery connections can help identify any visible issues.

4. Can I continue driving my vehicle with OBDII code P1B4C GMC present?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the hybrid/electric system components and potentially leave you stranded if the battery voltage drops too low.

5. How can I repair OBDII code P1B4C GMC?

- Repairing this code typically involves addressing the underlying cause, which may include replacing the hybrid/electric vehicle battery, repairing faulty connections, or recalibrating the battery management system. It is recommended to consult a qualified technician for accurate diagnosis and repair.

6. Are there any DIY tips for troubleshooting OBDII code P1B4C GMC?

- While basic visual inspections and checking for loose connections can be done by DIY enthusiasts, diagnosing and repairing complex hybrid/electric system issues associated with this code may require specialized knowledge and equipment best handled by professionals.

7. Can weather conditions affect OBDII code P1B4C GMC?

- Extreme temperatures, especially cold weather, can impact the performance and voltage levels of hybrid/electric vehicle batteries, potentially leading to the triggering of code P1B4C GMC. Ensuring proper battery maintenance and insulation can help mitigate weather-related issues.

8. How often should I have my hybrid/electric vehicle battery inspected to prevent OBDII code P1B4C GMC?

- It is recommended to have your hybrid/electric vehicle battery inspected as part of routine maintenance, typically every 1-2 years or according to the manufacturer's guidelines. Regular inspections can help detect potential issues early and prevent codes like P1B4C GMC from occurring.

9. Is OBDII code P1B4C GMC covered under any warranties?

- Depending on the vehicle's warranty coverage, issues related to the hybrid/electric system and associated codes like P1B4C GMC may be covered. It is advisable to check your vehicle's warranty documentation or consult with the manufacturer for specific details.

10. Can a low 12-volt battery cause OBDII code P1B4C GMC to appear?

- Yes, a weak or failing 12-volt battery in a hybrid/electric vehicle can sometimes trigger code P1B4C GMC due to insufficient power supply to the hybrid/electric system components. Ensuring the 12-volt battery is in good condition is important for overall system performance.