AutoCodes – Cadillac – P1B1A Cadillac

P1B1A Cadillac Code - Hybrid/Electric Vehicle Battery 28 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: P1B1A Cadillac indicates Hybrid/Electric Vehicle Battery 28 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 827

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 P1B1A 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 P1B1A Cadillac - Hybrid/Electric Vehicle Battery 28 Circuit Low Voltage - AutoCodes.com — P1B1A Cadillac Code - Hybrid/Electric Vehicle Battery 28 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B1A Cadillac?

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

How to Fix the DTC P1B1A 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 P1B1A 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.

Need more information about the P1B1A Cadillac code?

Need more information on how to fix the P1B1A Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1B1A Cadillac 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 P1B1A Cadillac Code

1. What are the common symptoms of OBDII code P1B1A in a Cadillac Hybrid/Electric Vehicle?

- Common symptoms include reduced power or acceleration, decreased fuel efficiency, and potentially the vehicle going into a reduced power mode or failing to start.

2. What are some possible causes of the Hybrid/Electric Vehicle Battery 28 Circuit Low Voltage code (P1B1A) in a Cadillac?

- Causes can include a faulty hybrid/electric vehicle battery, issues with the battery management system, damaged wiring or connectors related to the battery circuit, or a malfunctioning battery control module.

3. How can I diagnose the OBDII code P1B1A in my Cadillac Hybrid/Electric Vehicle?

- Diagnosis typically involves using a professional OBDII scanner to read the specific fault code and then conducting a thorough inspection of the hybrid/electric vehicle battery system, including checking the battery voltage levels and inspecting for any visible damage.

4. Is it safe to continue driving my Cadillac with the P1B1A code present?

- It is not recommended to continue driving the vehicle with the P1B1A code present, as it can lead to further damage to the hybrid/electric vehicle system and potentially result in a complete failure of the battery system.

5. Can I reset the OBDII code P1B1A in my Cadillac Hybrid/Electric Vehicle on my own?

- While you can clear the fault code with an OBDII scanner, it is crucial to address the underlying issue causing the code to prevent it from reoccurring. Simply clearing the code without addressing the root cause may lead to more severe problems.

6. What are some repair tips for fixing the Hybrid/Electric Vehicle Battery 28 Circuit Low Voltage code in a Cadillac?

- Repair tips may include checking and replacing damaged wiring or connectors, testing and potentially replacing the hybrid/electric vehicle battery, and ensuring the battery management system is functioning correctly.

7. How much does it typically cost to repair the P1B1A code in a Cadillac Hybrid/Electric Vehicle?

- Repair costs can vary depending on the specific cause of the issue, but it may involve expenses for parts replacement, diagnostic testing, and labor. It is advisable to consult with a professional mechanic for an accurate estimate.

8. Are there any recalls or technical service bulletins related to the OBDII code P1B1A in Cadillac Hybrid/Electric Vehicles?

- It is recommended to check with the manufacturer or authorized Cadillac service center for any recalls or technical service bulletins related to the P1B1A code to see if there are any known issues or solutions provided by the manufacturer.