AutoCodes – Buick – P0B74 Buick

P0B74 Buick 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 Buick 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 988

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC P0B74 Buick?

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

How to Fix the DTC P0B74 Buick?

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 Buick 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.

Need more information about the P0B74 Buick code?

Need more information on how to fix the P0B74 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0B74 Buick code diagnosed by a professional: Find a repair shop in your area

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 Buick Code

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

- Common symptoms include reduced battery performance, difficulty starting the vehicle, and illuminated warning lights on the dashboard.

2. What are the possible causes of the Hybrid/Electric Vehicle Battery 12 Circuit Low Voltage code (P0B74) in a Buick?

- The code P0B74 can be triggered by issues such as a faulty battery pack, damaged wiring, a malfunctioning battery management system, or a weak hybrid/electric vehicle battery.

3. How can I diagnose the Hybrid/Electric Vehicle Battery 12 Circuit Low Voltage code (P0B74) in my Buick?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific fault code, conducting a visual inspection of the battery and related components, and testing the battery voltage and connections.

4. Can driving with the OBDII code P0B74 present cause further damage to my Buick's hybrid/electric system?

- Continuing to drive with the code P0B74 present may lead to further battery degradation, reduced performance, and potential failure of the hybrid/electric system components.

5. How can I reset the OBDII code P0B74 in my Buick hybrid/electric vehicle?

- Resetting the code can be done using an OBDII scanner that has the capability to clear fault codes. However, it is important to address the underlying issue causing the code before resetting it.

6. Are there any DIY repair tips for fixing the Hybrid/Electric Vehicle Battery 12 Circuit Low Voltage code (P0B74) in a Buick?

- DIY repair tips may include checking and cleaning battery terminals, inspecting for any visible wiring damage, and ensuring proper battery cooling and ventilation.

7. Can a faulty hybrid/electric vehicle battery be repaired, or does it need to be replaced when dealing with code P0B74 in a Buick?

- In many cases, a faulty hybrid/electric vehicle battery will need to be replaced rather than repaired to resolve the P0B74 fault code and restore proper functionality.

8. How much does it typically cost to repair the Hybrid/Electric Vehicle Battery 12 Circuit Low Voltage code (P0B74) in a Buick?

- Repair costs can vary depending on the specific issue causing the code, but repairs related to the hybrid/electric system can be significant. It's recommended to consult with a professional for an accurate estimate.

9. Is it safe to drive my Buick with the OBDII code P0B74 Buick active?

- It is not recommended to drive the vehicle with the P0B74 code active, as it can lead to further damage to the hybrid/electric system. It's best to address the issue promptly to avoid potential safety hazards.

10. Can a regular mechanic repair the Hybrid/Electric Vehicle Battery 12 Circuit Low Voltage code (P0B74) in my Buick, or should I seek out a specialized technician?

- Due to the complexity of hybrid/electric vehicle systems, it is advisable to seek out a mechanic or technician with experience in diagnosing and repairing such systems to effectively address the P0B74 fault code in your Buick.