AutoCodes – GMC – P1B4B GMC

P1B4B GMC Code - Hybrid/Electric Vehicle Battery 35 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: P1B4B GMC indicates Hybrid/Electric Vehicle Battery 35 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 867

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 P1B4B 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 P1B4B GMC - Hybrid/Electric Vehicle Battery 35 Circuit Performance - AutoCodes.com — P1B4B GMC Code - Hybrid/Electric Vehicle Battery 35 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B4B GMC?

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

How to Fix the DTC P1B4B 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 P1B4B 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 P1B4B GMC Code

1. What are the common symptoms of OBDII code P1B4B GMC related to Hybrid/Electric Vehicle Battery 35 Circuit Performance?

- Common symptoms include reduced driving range, poor battery performance, and potential warning lights on the dashboard.

2. What are the possible causes of OBDII code P1B4B GMC indicating Hybrid/Electric Vehicle Battery 35 Circuit Performance issues?

- Possible causes include a faulty battery pack, damaged wiring in the battery circuit, or issues with the battery management system.

3. How can I diagnose the OBDII code P1B4B GMC for Hybrid/Electric Vehicle Battery 35 Circuit Performance problems?

- Diagnosis typically involves using a scan tool to retrieve the code, conducting a visual inspection of the battery and circuit components, and performing voltage tests.

4. Can I continue driving my vehicle with the OBDII code P1B4B GMC related to Hybrid/Electric Vehicle Battery 35 Circuit Performance?

- It is not recommended to continue driving the vehicle with this code, as it can lead to further damage to the hybrid/electric system.

5. What are some repair tips for fixing OBDII code P1B4B GMC issues with Hybrid/Electric Vehicle Battery 35 Circuit Performance?

- Repair tips may include repairing or replacing damaged wiring, replacing the battery pack if necessary, and resetting the battery management system.

6. Is it possible to reset the OBDII code P1B4B GMC related to Hybrid/Electric Vehicle Battery 35 Circuit Performance without professional help?

- While some codes can be cleared with a scan tool, it is recommended to have a professional diagnose and address the underlying issue to prevent future problems.

7. How much does it typically cost to repair OBDII code P1B4B GMC problems associated with Hybrid/Electric Vehicle Battery 35 Circuit Performance?

- The cost of repair can vary depending on the specific issue, but it may range from a few hundred to a few thousand dollars, especially if the battery pack needs replacement.

8. Can a DIY enthusiast repair OBDII code P1B4B GMC issues related to Hybrid/Electric Vehicle Battery 35 Circuit Performance?

- While some basic troubleshooting and repairs can be done by DIY enthusiasts, complex issues with the hybrid/electric system should be addressed by a trained professional.

9. How often should I have my hybrid/electric vehicle checked for potential OBDII code P1B4B GMC problems?

- It is recommended to have your vehicle regularly serviced and checked by a qualified technician to prevent and address any potential issues with the hybrid/electric system.

10. Are there any recalls or technical service bulletins related to OBDII code P1B4B GMC and Hybrid/Electric Vehicle Battery 35 Circuit Performance?

- It is advisable to check with the vehicle manufacturer or authorized dealerships for any recalls or technical bulletins related to this specific OBDII code to stay informed about potential issues and solutions.