AutoCodes – Chevrolet – P1B28 Chevrolet

P1B28 Chevrolet Code - Hybrid/Electric Vehicle Battery 27 Circuit

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: P1B28 Chevrolet indicates Hybrid/Electric Vehicle Battery 27 Circuit.
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 1,051

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 P1B28 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 P1B28 Chevrolet - Hybrid/Electric Vehicle Battery 27 Circuit - AutoCodes.com — P1B28 Chevrolet Code - Hybrid/Electric Vehicle Battery 27 Circuit

What does this mean?

What are the Possible Causes of the DTC P1B28 Chevrolet?

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

How to Fix the DTC P1B28 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 P1B28 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.

Need more information about the P1B28 Chevrolet code?

Need more information on how to fix the P1B28 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1B28 Chevrolet 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 P1B28 Chevrolet Code

1. What are the common symptoms of OBDII code P1B28 in a Chevrolet Hybrid/Electric Vehicle?

- Common symptoms include reduced hybrid system performance, decreased fuel efficiency, and potential problems with the battery charging system.

2. What are some possible causes of the OBDII code P1B28 in a Chevrolet Hybrid/Electric Vehicle?

- Possible causes include a fault in the hybrid/electric vehicle battery pack, issues with the battery management system, or wiring/connectivity problems in the battery 27 circuit.

3. How can I diagnose the OBDII code P1B28 in my Chevrolet Hybrid/Electric Vehicle?

- Diagnosing this code typically requires using a professional OBDII scanner to retrieve the specific trouble code and then conducting further testing to pinpoint the exact cause within the battery 27 circuit.

4. Is it safe to continue driving my Chevrolet Hybrid/Electric Vehicle with the OBDII code P1B28 present?

- It is not recommended to drive the vehicle with this code active, as it may lead to further damage to the hybrid/electric system and compromise the vehicle's performance and safety.

5. How can I repair the OBDII code P1B28 in my Chevrolet Hybrid/Electric Vehicle?

- Repairing this code usually involves addressing the underlying issue within the battery 27 circuit, which may require replacing damaged components, repairing wiring faults, or recalibrating the battery management system.

6. Can I reset the OBDII code P1B28 in my Chevrolet Hybrid/Electric Vehicle by disconnecting the battery?

- While disconnecting the battery may clear the code temporarily, it is not a recommended long-term solution as the underlying issue causing the code will likely persist and trigger the code again.

7. How much does it typically cost to repair the OBDII code P1B28 in a Chevrolet Hybrid/Electric Vehicle?

- Repair costs can vary depending on the exact cause of the code and the specific components that need to be repaired or replaced, but it is advisable to consult with a professional mechanic for an accurate estimate.

8. Are there any preventive maintenance measures I can take to avoid the OBDII code P1B28 in my Chevrolet Hybrid/Electric Vehicle?

- Regularly servicing the hybrid/electric system, monitoring battery health, and addressing any warning signs promptly can help prevent issues that may trigger the P1B28 trouble code.

9. Can I drive my Chevrolet Hybrid/Electric Vehicle in gasoline mode if the OBDII code P1B28 is detected?

- It is generally safe to operate the vehicle in gasoline mode if the code is detected, but it is still recommended to have the issue diagnosed and repaired as soon as possible to restore full hybrid functionality.

10. Will the OBDII code P1B28 affect the overall reliability of my Chevrolet Hybrid/Electric Vehicle?

- While the code itself may not directly impact the vehicle's reliability, ignoring the underlying issue that triggered the code could lead to more severe problems with the hybrid/electric system over time.