AutoCodes – Chevrolet – P1B74 Chevrolet

P1B74 Chevrolet Code - Hybrid/Electric Vehicle Battery 48 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: P1B74 Chevrolet indicates Hybrid/Electric Vehicle Battery 48 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 898

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 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B74 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 P1B74 Chevrolet - Hybrid/Electric Vehicle Battery 48 Circuit High Voltage - AutoCodes.com — P1B74 Chevrolet Code - Hybrid/Electric Vehicle Battery 48 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B74 Chevrolet?

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

How to Fix the DTC P1B74 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 P1B74 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 P1B74 Chevrolet Code

1. What are the common symptoms of OBDII code P1B74 in a Chevrolet hybrid/electric vehicle?

- Common symptoms include the check engine light illuminating, reduced hybrid/electric vehicle performance, and potential issues with the high voltage battery system.

2. What does the OBDII code P1B74 Chevrolet indicate?

- This code specifically points to a high voltage circuit issue within the hybrid/electric vehicle battery system, possibly related to an overvoltage condition.

3. What are the possible causes of the P1B74 code in a Chevrolet hybrid/electric vehicle?

- Potential causes include a faulty high voltage battery pack, damaged wiring or connectors in the battery circuit, or issues with the battery management system.

4. Can driving with the P1B74 code present cause further damage to the vehicle?

- Continuing to drive with this code present can potentially lead to further damage to the high voltage battery system and may compromise the safety and performance of the vehicle.

5. How can I diagnose and repair the P1B74 code in my Chevrolet hybrid/electric vehicle?

- Diagnosis typically involves inspecting the high voltage battery system, checking for any visible damage or loose connections, and using specialized diagnostic tools to pinpoint the exact issue for repair.

6. Is it safe to attempt DIY repairs for the P1B74 code in a Chevrolet hybrid/electric vehicle?

- Due to the high voltage nature of the system involved, it is recommended to seek professional assistance for diagnosing and repairing the P1B74 code to ensure safety and proper handling of the high voltage components.

7. How much does it typically cost to repair the P1B74 code in a Chevrolet hybrid/electric vehicle?

- Repair costs can vary depending on the extent of the issue and the specific components needing replacement, but it is advisable to budget for potentially higher repair expenses due to the specialized nature of the high voltage battery system.

8. Can resetting the OBDII code P1B74 in a Chevrolet hybrid/electric vehicle make the issue go away?

- Resetting the code may temporarily clear the check engine light, but the underlying issue causing the P1B74 code will likely persist and should be properly diagnosed and repaired to prevent further problems.

9. Are there any preventative maintenance tips to avoid encountering the P1B74 code in a Chevrolet hybrid/electric vehicle?

- Regularly inspecting the high voltage battery system, following manufacturer recommendations for maintenance, and addressing any warning signs promptly can help prevent issues leading to the P1B74 code.