AutoCodes – Chevrolet – P0B74 Chevrolet

P0B74 Chevrolet 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 Chevrolet 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 1,284

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

What does this mean?

What are the Possible Causes of the DTC P0B74 Chevrolet?

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

How to Fix the DTC P0B74 Chevrolet?

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 Chevrolet 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 Chevrolet Code

1. What are the common symptoms of OBDII code P0B74 in a Chevrolet hybrid/electric vehicle?

- Common symptoms include a Check Engine light on the dashboard, reduced power or drivability issues, and potentially decreased fuel efficiency.

2. What does the OBDII code P0B74 Chevrolet Hybrid/Electric Vehicle Battery 12 Circuit Low Voltage indicate?

- This code specifically points to a low voltage condition in the 12-volt circuit of the hybrid/electric vehicle battery system.

3. What are the possible causes of the P0B74 code in a Chevrolet hybrid/electric vehicle?

- The code can be triggered by a weak or failing 12-volt battery, loose or corroded battery connections, issues with the battery management system, or a faulty sensor.

4. How can I diagnose the underlying issue causing the P0B74 code in my Chevrolet hybrid/electric vehicle?

- A thorough inspection of the 12-volt battery, checking for corrosion or loose connections, testing the battery voltage, and scanning for any related trouble codes can help diagnose the problem.

5. Can I continue driving my Chevrolet hybrid/electric vehicle with the P0B74 code present?

- It is not recommended to continue driving the vehicle with the P0B74 code active, as it can lead to further damage to the battery system and potentially unsafe driving conditions.

6. What are some repair tips for addressing the P0B74 code in a Chevrolet hybrid/electric vehicle?

- Start by checking and cleaning the battery terminals, testing the 12-volt battery, inspecting the battery management system components, and consulting a professional if needed.

7. Is it possible to reset the P0B74 code in a Chevrolet hybrid/electric vehicle by disconnecting the battery?

- Disconnecting the battery may temporarily clear the code, but it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. How much does it typically cost to repair the P0B74 code in a Chevrolet hybrid/electric vehicle?

- The cost of repair can vary depending on the specific cause of the code, but it may involve replacing the 12-volt battery, repairing connections, or addressing issues with the battery management system.

9. Are there any preventive maintenance measures to help avoid the P0B74 code in a Chevrolet hybrid/electric vehicle?

- Regularly checking the 12-volt battery, keeping connections clean and secure, and following the manufacturer's recommended maintenance schedule can help prevent the occurrence of the P0B74 code.

10. Can I use a generic OBDII scanner to read and clear the P0B74 code in my Chevrolet hybrid/electric vehicle?

- While a generic OBDII scanner can read and clear some codes, it may not provide detailed information specific to the hybrid/electric vehicle system. It is recommended to use a scanner compatible with the vehicle's system for accurate diagnosis and repair.