AutoCodes – Cadillac – P0B4B Cadillac

P0B4B Cadillac Code - Hybrid/Electric Vehicle Battery 4 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: P0B4B Cadillac indicates Hybrid/Electric Vehicle Battery 4 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 946

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 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0B4B 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 P0B4B Cadillac - Hybrid/Electric Vehicle Battery 4 Circuit Performance - AutoCodes.com — P0B4B Cadillac Code - Hybrid/Electric Vehicle Battery 4 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P0B4B Cadillac?

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

How to Fix the DTC P0B4B 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 P0B4B 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 P0B4B Cadillac Code

1. What does the OBDII code P0B4B mean on a Cadillac?

P0B4B indicates an issue with the performance of the Hybrid/Electric Vehicle Battery 4 Circuit, suggesting a problem with a specific module or sensor within the hybrid battery system.

2. What are the common symptoms of code P0B4B on a Cadillac?

Common symptoms include reduced fuel efficiency, limited hybrid system performance, warning lights on the dashboard, and possible drivability issues.

3. What causes the P0B4B code on a Cadillac?

Potential causes include a faulty hybrid battery cell, wiring or connection issues, a malfunctioning battery control module, or degraded battery performance.

4. Can I drive my Cadillac with the P0B4B code active?

While the vehicle may still be drivable, it's not recommended to ignore the code as it could lead to further damage or reduced hybrid system functionality.

5. How is the P0B4B code diagnosed on a Cadillac?

Diagnosis typically involves scanning the vehicle with an advanced OBDII tool, checking the hybrid battery voltage and resistance, inspecting wiring and connections, and testing the battery control module.

6. How do I fix the P0B4B code on my Cadillac?

Repairs may include replacing the faulty hybrid battery module, repairing or replacing damaged wiring, or reprogramming/updating the battery control module.

7. How much does it cost to repair a P0B4B code on a Cadillac?

Repair costs can vary widely, ranging from $100 for minor wiring fixes to over $1,000 if the hybrid battery or control module needs replacement.

8. Can a low 12-volt battery cause the P0B4B code on a Cadillac?

A weak 12-volt battery can sometimes affect hybrid system diagnostics, but the code typically points to a problem in the high-voltage hybrid battery system.

9. Is the P0B4B code covered under warranty on a Cadillac?

Hybrid system components, including the battery, may be covered under a specific hybrid or emissions warranty. Check your vehicleâ€™s warranty terms for details.

10. Can I reset the P0B4B code without fixing the problem?

You can clear the code temporarily with an OBDII scanner, but it will likely return if the underlying issue is not resolved.