AutoCodes – GMC – P1B4D GMC

P1B4D GMC Code - Hybrid/Electric Vehicle Battery 35 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: P1B4D GMC indicates Hybrid/Electric Vehicle Battery 35 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 950

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 P1B4D 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 P1B4D GMC - Hybrid/Electric Vehicle Battery 35 Circuit High Voltage - AutoCodes.com — P1B4D GMC Code - Hybrid/Electric Vehicle Battery 35 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B4D GMC?

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

How to Fix the DTC P1B4D 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 P1B4D 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 P1B4D GMC Code

1. What are the common symptoms of OBDII code P1B4D in a GMC Hybrid/Electric Vehicle?

- Common symptoms include check engine light illuminated, reduced power mode, and potential issues with the vehicle's hybrid/electric drive system.

2. What does the OBDII code P1B4D GMC indicate about the Hybrid/Electric Vehicle Battery 35 Circuit High Voltage?

- The code indicates a high voltage condition in the Hybrid/Electric Vehicle Battery 35 Circuit, which can affect the vehicle's performance and safety.

3. What are the possible causes of the Hybrid/Electric Vehicle Battery 35 Circuit High Voltage code P1B4D in a GMC vehicle?

- Possible causes include a faulty high voltage battery, issues with the battery management system, damaged wiring, or a malfunctioning battery control module.

4. How can I diagnose the OBDII code P1B4D related to the Hybrid/Electric Vehicle Battery 35 Circuit High Voltage in my GMC vehicle?

- Diagnosing this code typically involves using a professional OBDII scanner to read the code, inspecting the high voltage battery components, and testing the relevant circuits for proper voltage levels.

5. Can I continue driving my GMC Hybrid/Electric vehicle with the OBDII code P1B4D present?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the high voltage system and potential safety hazards.

6. How can I reset the OBDII code P1B4D in my GMC Hybrid/Electric vehicle?

- While you can reset the code using an OBDII scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.

7. Is it safe to attempt repairs on the Hybrid/Electric Vehicle Battery 35 Circuit High Voltage issue myself?

- Due to the high voltage nature of the system, it is recommended to seek professional help or consult the vehicle's service manual before attempting any repairs on the high voltage components.

8. Will fixing the OBDII code P1B4D in my GMC vehicle be expensive?

- The cost of repairs can vary depending on the exact cause of the issue. It is advisable to get a diagnosis from a qualified mechanic to determine the extent of the problem and associated costs.

9. Are there any preventive maintenance tips to avoid encountering the OBDII code P1B4D in a GMC Hybrid/Electric vehicle?

- Regularly inspecting the high voltage components, following the manufacturer's maintenance schedule, and addressing any warning signs promptly can help prevent issues leading to this OBDII code.

10. Can the OBDII code P1B4D GMC affect the overall reliability of my Hybrid/Electric vehicle?

- Yes, unresolved issues related to this code can impact the vehicle's reliability, performance, and safety, making it essential to address the problem in a timely manner.