AutoCodes – GMC – P1B4A GMC

P1B4A GMC Code - Hybrid/Electric Vehicle Battery 34 Circuit High 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: P1B4A GMC indicates Hybrid/Electric Vehicle Battery 34 Circuit High 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 775

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B4A 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 P1B4A GMC - Hybrid/Electric Vehicle Battery 34 Circuit High Voltage - AutoCodes.com — P1B4A GMC Code - Hybrid/Electric Vehicle Battery 34 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B4A GMC?

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

How to Fix the DTC P1B4A 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 P1B4A 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 P1B4A GMC Code

1. What are common symptoms of OBDII code P1B4A GMC related to the Hybrid/Electric Vehicle Battery 34 Circuit High Voltage?

- Common symptoms include reduced electric vehicle range, poor battery performance, and illuminated warning lights on the dashboard.

2. What are possible causes of OBDII code P1B4A GMC indicating Hybrid/Electric Vehicle Battery 34 Circuit High Voltage?

- Possible causes include high voltage circuit faults, issues with battery temperature sensors, or problems with the battery management system.

3. How can I diagnose the OBDII code P1B4A GMC for Hybrid/Electric Vehicle Battery 34 Circuit High Voltage?

- Diagnosis involves using a diagnostic scanner to retrieve the code, checking the high voltage circuits, inspecting temperature sensors, and testing the battery management system.

4. Can I continue driving with OBDII code P1B4A GMC related to Hybrid/Electric Vehicle Battery 34 Circuit High Voltage?

- It is not recommended to continue driving with this code present, as it can lead to further damage to the battery system and potentially unsafe driving conditions.

5. How can I reset the OBDII code P1B4A GMC for Hybrid/Electric Vehicle Battery 34 Circuit High Voltage?

- Resetting the code involves using a diagnostic scanner to clear the code after any necessary repairs have been made to address the underlying issue.

6. Are there any DIY repair tips for addressing OBDII code P1B4A GMC on a GMC Hybrid/Electric Vehicle?

- DIY repair tips include checking for loose connections, inspecting wiring harnesses for damage, and ensuring proper battery maintenance according to manufacturer guidelines.

7. How much does it typically cost to repair OBDII code P1B4A GMC related to Hybrid/Electric Vehicle Battery 34 Circuit High Voltage?

- Repair costs can vary depending on the specific issue, but they may range from a few hundred to over a thousand dollars, especially if components need to be replaced.

8. Can OBDII code P1B4A GMC be triggered by environmental factors or extreme weather conditions?

- Yes, extreme temperatures or environmental factors can sometimes trigger this code due to their impact on the battery system's performance and sensors.

9. Is it safe to attempt to clear the OBDII code P1B4A GMC without addressing the underlying issue?

- It is not recommended to clear the code without addressing the underlying problem, as it may lead to recurring issues and potential safety hazards associated with the battery system.

10. How can regular maintenance help prevent OBDII code P1B4A GMC on a GMC Hybrid/Electric Vehicle?

- Regular maintenance, such as checking and maintaining the battery system, monitoring for any warning signs, and following manufacturer recommendations, can help prevent issues leading to this code.