AutoCodes – GMC – P0B74 GMC

P0B74 GMC Code - Hybrid/Electric Vehicle Battery 12 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: P0B74 GMC indicates Hybrid/Electric Vehicle Battery 12 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 844

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 P0B74 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 P0B74 GMC - Hybrid/Electric Vehicle Battery 12 Circuit Low Voltage - AutoCodes.com — P0B74 GMC Code - Hybrid/Electric Vehicle Battery 12 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0B74 GMC?

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

How to Fix the DTC P0B74 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 P0B74 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 P0B74 GMC Code

1. What are common symptoms of OBDII code P0B74 in a GMC Hybrid/Electric Vehicle?

- Common symptoms include a decrease in fuel efficiency, reduced power output, and potential issues with starting the vehicle.

2. What can cause the OBDII code P0B74 in a GMC Hybrid/Electric Vehicle?

- The code P0B74 indicates a Hybrid/Electric Vehicle Battery 12 Circuit Low Voltage, which can be caused by a weak or failing hybrid battery, poor electrical connections, or a malfunctioning battery management system.

3. How can I diagnose the OBDII code P0B74 in my GMC Hybrid/Electric Vehicle?

- Diagnosing the code P0B74 typically involves using a diagnostic scanner to retrieve the specific error code, checking the hybrid battery voltage levels, inspecting electrical connections, and testing the battery management system.

4. Can I continue driving my GMC Hybrid/Electric Vehicle with the OBDII code P0B74?

- It is not recommended to continue driving your vehicle with the code P0B74, as it can lead to further damage to the hybrid battery system and potentially leave you stranded.

5. How can I repair the OBDII code P0B74 in my GMC Hybrid/Electric Vehicle?

- Repairing the code P0B74 may involve replacing the hybrid battery, repairing any faulty electrical connections, or reprogramming the battery management system. It is recommended to consult a professional mechanic for proper diagnosis and repair.

6. Are there any specific maintenance tips to prevent the OBDII code P0B74 in a GMC Hybrid/Electric Vehicle?

- To prevent the code P0B74, it is important to regularly maintain your hybrid battery system, ensure all electrical connections are secure, and follow the manufacturer's recommended maintenance schedule for your vehicle.

7. Can a DIY enthusiast fix the OBDII code P0B74 in a GMC Hybrid/Electric Vehicle?

- While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing the code P0B74 in a Hybrid/Electric Vehicle often requires specialized tools and expertise. It is best to consult a professional mechanic for proper diagnosis and repair.

8. How much does it cost to repair the OBDII code P0B74 in a GMC Hybrid/Electric Vehicle?

- The cost of repairing the code P0B74 can vary depending on the underlying cause, the extent of the damage, and the specific repairs needed. It is recommended to obtain quotes from reputable mechanics or dealerships for an accurate estimate.

9. Is the OBDII code P0B74 a common issue in GMC Hybrid/Electric Vehicles?

- The code P0B74 indicating a Hybrid/Electric Vehicle Battery 12 Circuit Low Voltage is not uncommon in GMC Hybrid/Electric Vehicles, especially as the vehicles age and the hybrid battery system experiences wear and tear.

10. Can the OBDII code P0B74 in a GMC Hybrid/Electric Vehicle be reset without repairs?

- While you can reset the code P0B74 using a diagnostic scanner, it is important to address the underlying issue causing the fault code to prevent further damage to the hybrid battery system. Resetting the code without repairs may lead to recurring issues and potential safety hazards.