AutoCodes – GMC – P1B28 GMC

P1B28 GMC 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 GMC 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.

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Code Popularity 965

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

What does this mean?

What are the Possible Causes of the DTC P1B28 GMC?

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

How to Fix the DTC P1B28 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 P1B28 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 P1B28 GMC Code

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

- Common symptoms may include reduced electric vehicle range, difficulty starting the vehicle, and illuminated warning lights on the dashboard related to the hybrid/electric system.

2. What does OBDII code P1B28 in a GMC Hybrid/Electric Vehicle indicate?

- This code specifically relates to an issue with Hybrid/Electric Vehicle Battery 27 Circuit, indicating a problem with the electrical circuit associated with the 27th battery in the hybrid system.

3. What are possible causes of OBDII code P1B28 in a GMC Hybrid/Electric Vehicle?

- Causes can include a faulty battery cell, damaged wiring or connectors in the circuit, a malfunctioning battery management system, or issues with the hybrid control module.

4. How serious is OBDII code P1B28 in a GMC Hybrid/Electric Vehicle?

- This code should be addressed promptly to avoid potential damage to the hybrid/electric system and ensure the vehicle operates safely and efficiently.

5. Can I continue driving my GMC Hybrid/Electric Vehicle with OBDII code P1B28 present?

- It is not recommended to continue driving the vehicle with this code active, as it can lead to further damage and potential safety hazards.

6. How can I diagnose and repair OBDII code P1B28 in my GMC Hybrid/Electric Vehicle?

- Diagnosis typically involves inspecting the 27th battery circuit, testing the battery cells, checking wiring and connectors, and scanning the hybrid control module for fault codes. Repair may involve replacing a faulty component or addressing wiring issues.

7. Is it necessary to take my GMC Hybrid/Electric Vehicle to a dealership for OBDII code P1B28 diagnosis and repair?

- While a dealership may have specialized knowledge and equipment for hybrid/electric vehicle systems, an experienced automotive technician familiar with these systems can also diagnose and repair this code effectively.

8. Can a DIY enthusiast address OBDII code P1B28 in a GMC Hybrid/Electric Vehicle?

- Due to the complex nature of hybrid/electric vehicle systems, it is recommended to seek professional help for diagnosis and repair of this code to ensure proper handling of the high-voltage components involved.

9. How can I prevent OBDII code P1B28 from occurring in my GMC Hybrid/Electric Vehicle?

- Regular maintenance, including keeping the hybrid/electric system components in good condition, checking the battery health, and addressing any warning signs promptly, can help prevent this code from appearing.

10. Are there any recalls or technical service bulletins related to OBDII code P1B28 in GMC Hybrid/Electric Vehicles?

- It's advisable to check with a GMC dealership or visit the manufacturer's website to inquire about any recalls or technical service bulletins specifically addressing OBDII code P1B28 in their Hybrid/Electric Vehicles.