AutoCodes – Cadillac – P1B28 Cadillac

P1B28 Cadillac 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 Cadillac 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 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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B28 Cadillac 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 Cadillac - Hybrid/Electric Vehicle Battery 27 Circuit - AutoCodes.com — P1B28 Cadillac Code - Hybrid/Electric Vehicle Battery 27 Circuit

What does this mean?

What are the Possible Causes of the DTC P1B28 Cadillac?

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

How to Fix the DTC P1B28 Cadillac?

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 Cadillac 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 Cadillac Code

1. What are the common symptoms of OBDII code P1B28 in a Cadillac hybrid/electric vehicle?

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

2. What could be causing the OBDII code P1B28 in a Cadillac hybrid/electric vehicle?

- Possible causes include a faulty battery pack, issues with the battery management system, or problems with the battery circuit.

3. How can I diagnose the OBDII code P1B28 in my Cadillac hybrid/electric vehicle?

- Diagnostic steps may include checking the battery voltage, inspecting the battery connections, and using a professional diagnostic scanner to read the code.

4. Can I drive my Cadillac with the OBDII code P1B28 present?

- It is not recommended to drive the vehicle with this code active, as it could lead to further damage to the battery system or affect the vehicle's performance.

5. How serious is the OBDII code P1B28 in a Cadillac hybrid/electric vehicle?

- This code indicates a problem with the hybrid/electric vehicle battery circuit, which can impact the vehicle's overall performance and efficiency.

6. What should I do if I encounter the OBDII code P1B28 in my Cadillac hybrid/electric vehicle?

- It is advised to have the vehicle inspected by a qualified technician to determine the exact cause of the issue and perform necessary repairs.

7. Are there any common repair tips for fixing the OBDII code P1B28 in a Cadillac hybrid/electric vehicle?

- Repair tips may include checking and cleaning the battery terminals, testing the battery cells, and ensuring proper connection of the battery components.

8. How much does it cost to repair the OBDII code P1B28 in a Cadillac hybrid/electric vehicle?

- Repair costs can vary depending on the exact cause of the issue, but it is recommended to obtain a diagnosis from a professional technician to get an accurate estimate.

9. Can I reset the OBDII code P1B28 in my Cadillac hybrid/electric vehicle myself?

- While you may be able to clear the code using a diagnostic scanner, it is crucial to address the underlying issue causing the code to prevent further issues.

10. How can I prevent the OBDII code P1B28 from appearing in my Cadillac hybrid/electric vehicle?

- Regular maintenance, such as checking the battery health, monitoring charging habits, and following the manufacturer's guidelines, can help prevent this code from appearing.