AutoCodes – GMC – P1B4F GMC

P1B4F GMC Code - Hybrid/Electric Vehicle Battery 36 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: P1B4F GMC indicates Hybrid/Electric Vehicle Battery 36 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 812

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 P1B4F 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 P1B4F GMC - Hybrid/Electric Vehicle Battery 36 Circuit Low Voltage - AutoCodes.com — P1B4F GMC Code - Hybrid/Electric Vehicle Battery 36 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B4F GMC?

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

How to Fix the DTC P1B4F 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 P1B4F 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 P1B4F GMC Code

1. What are common symptoms of OBDII code P1B4F GMC (Hybrid/Electric Vehicle Battery 36 Circuit Low Voltage)?

- Common symptoms include reduced electric vehicle range, poor hybrid system performance, and potential warning lights on the dashboard.

2. What can cause OBDII code P1B4F GMC to trigger?

- This code is typically triggered by a low voltage condition in the hybrid/electric vehicle battery 36 circuit, which can be caused by battery failure, wiring issues, or a faulty battery management system.

3. How can I diagnose the cause of OBDII code P1B4F GMC?

- Diagnosing the cause of this code usually involves checking the hybrid/electric vehicle battery voltage, inspecting the battery connections and wiring, and using a scan tool to gather additional diagnostic information.

4. Can I still drive my vehicle with OBDII code P1B4F GMC present?

- It is not recommended to drive the vehicle with this code present, as it may lead to further damage to the hybrid/electric system and potentially leave you stranded due to a depleted battery.

5. What are some repair tips for resolving OBDII code P1B4F GMC?

- Repair tips may include checking and cleaning battery connections, testing the battery voltage and cells, inspecting the wiring harness for damage, and resetting the fault code after repairs are made.

6. Is it safe to attempt repairs for OBDII code P1B4F GMC on my own?

- Unless you have experience working on hybrid/electric vehicle systems, it is recommended to seek professional assistance for diagnosing and repairing this code to avoid the risk of electric shock or damage to the vehicle.

7. How serious is OBDII code P1B4F GMC?

- This code should be addressed promptly, as a low voltage condition in the hybrid/electric vehicle battery 36 circuit can impact the performance and reliability of the vehicle's hybrid system.

8. Can a weak hybrid/electric vehicle battery cause OBDII code P1B4F GMC to appear?

- Yes, a weak or failing hybrid/electric vehicle battery can lead to a low voltage condition in the battery 36 circuit, triggering OBDII code P1B4F GMC.

9. Are there any recalls or technical service bulletins related to OBDII code P1B4F GMC?

- It is recommended to check with the vehicle manufacturer or authorized dealerships for any recalls or technical service bulletins related to this specific OBDII code to determine if there are known issues or solutions.

10. How can I prevent OBDII code P1B4F GMC from reoccurring in the future?

- Regular maintenance of the hybrid/electric vehicle battery, including monitoring voltage levels, keeping connections clean and secure, and addressing any issues promptly, can help prevent the recurrence of OBDII code P1B4F GMC.