AutoCodes – Cadillac – P1B4B Cadillac

P1B4B Cadillac Code - Hybrid/Electric Vehicle Battery 35 Circuit Performance

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: P1B4B Cadillac indicates Hybrid/Electric Vehicle Battery 35 Circuit Performance.
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 813

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 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B4B 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 P1B4B Cadillac - Hybrid/Electric Vehicle Battery 35 Circuit Performance - AutoCodes.com — P1B4B Cadillac Code - Hybrid/Electric Vehicle Battery 35 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B4B Cadillac?

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

How to Fix the DTC P1B4B 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 P1B4B 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 P1B4B Cadillac Code

1. What are common symptoms of OBDII code P1B4B in a Cadillac hybrid/electric vehicle?

- Common symptoms include reduced fuel efficiency, loss of power, and potential issues with the vehicle's hybrid/electric battery.

2. What can cause the OBDII code P1B4B in a Cadillac hybrid/electric vehicle?

- The code P1B4B can be triggered by a variety of issues such as a faulty hybrid/electric battery, damaged wiring, or a failing battery control module.

3. How can I diagnose the OBDII code P1B4B in my Cadillac hybrid/electric vehicle?

- Diagnosing the code requires using a professional OBDII scanner to retrieve the specific fault code and then conducting further testing on the hybrid/electric battery system components.

4. What are the repair options for fixing OBDII code P1B4B in a Cadillac hybrid/electric vehicle?

- Repair options can include replacing the hybrid/electric battery, repairing damaged wiring, reprogramming the battery control module, or addressing any other underlying issues identified during diagnosis.

5. Can I drive my Cadillac with the OBDII code P1B4B present?

- It is not recommended to continue driving the vehicle with the code present, as it can lead to further damage to the hybrid/electric system and potentially compromise the vehicle's performance and safety.

6. How much does it typically cost to repair the OBDII code P1B4B in a Cadillac hybrid/electric vehicle?

- Repair costs can vary depending on the specific issue causing the code, but they can range from a few hundred dollars for minor repairs to over a thousand dollars for more extensive battery replacements or module reprogramming.

7. Are there any preventive maintenance tips to avoid triggering the OBDII code P1B4B in a Cadillac hybrid/electric vehicle?

- Regularly checking the hybrid/electric battery system, keeping up with maintenance schedules, and addressing any warning signs promptly can help prevent issues that may trigger the code.

8. Can a DIY enthusiast attempt to fix the OBDII code P1B4B issue in a Cadillac hybrid/electric vehicle?

- While some basic troubleshooting steps can be taken, diagnosing and repairing the code P1B4B in a hybrid/electric vehicle typically requires specialized knowledge and equipment, so it is recommended to seek professional help.

9. How long does it take to repair the OBDII code P1B4B in a Cadillac hybrid/electric vehicle?

- The repair time can vary depending on the complexity of the issue and the availability of parts, but it can range from a few hours to a couple of days for more involved repairs.

10. Is the OBDII code P1B4B a common issue in Cadillac hybrid/electric vehicles?

- While not extremely common, the OBDII code P1B4B related to Hybrid/Electric Vehicle Battery 35 Circuit Performance can occur in Cadillac hybrid/electric vehicles, especially as they age or if maintenance is neglected.