AutoCodes – Cadillac – P1B4A Cadillac

P1B4A Cadillac Code - Hybrid/Electric Vehicle Battery 34 Circuit High 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: P1B4A Cadillac indicates Hybrid/Electric Vehicle Battery 34 Circuit High 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.

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Code Popularity 791

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 P1B4A 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 P1B4A Cadillac - Hybrid/Electric Vehicle Battery 34 Circuit High Voltage - AutoCodes.com — P1B4A Cadillac Code - Hybrid/Electric Vehicle Battery 34 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1B4A Cadillac?

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

How to Fix the DTC P1B4A 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 P1B4A 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 P1B4A Cadillac Code

1. What are the common symptoms of OBDII code P1B4A in a Cadillac Hybrid/Electric Vehicle?

- Common symptoms include illuminated check engine light, reduced hybrid system performance, and potential issues with the high voltage circuit.

2. What can cause the OBDII code P1B4A in a Cadillac Hybrid/Electric Vehicle?

- This code is typically triggered by a high voltage condition detected in the hybrid/electric vehicle battery 34 circuit, which can be caused by wiring faults, faulty components, or malfunctioning sensors.

3. How serious is the OBDII code P1B4A in a Cadillac Hybrid/Electric Vehicle?

- This code should be addressed promptly, as it indicates a potential issue with the high voltage circuit in the battery system, which can impact the vehicle's performance and safety.

4. Can I continue driving my Cadillac Hybrid/Electric Vehicle with the P1B4A fault code?

- It is not recommended to drive the vehicle with this fault code present, as it can lead to further damage to the hybrid/electric system and potentially unsafe driving conditions.

5. How can I diagnose and repair the OBDII code P1B4A in my Cadillac Hybrid/Electric Vehicle?

- Diagnosis typically involves checking the high voltage circuit for any faults, inspecting wiring and connectors, and testing components like sensors and modules. Repair may involve replacing damaged parts or repairing wiring issues.

6. Are there any DIY tips for addressing the P1B4A fault code in a Cadillac Hybrid/Electric Vehicle?

- While some basic troubleshooting like checking for loose connections or damaged wiring can be done by DIY enthusiasts, diagnosing and repairing high voltage circuit issues should be left to experienced professionals due to the safety risks involved.

7. How much does it cost to fix the OBDII code P1B4A in a Cadillac Hybrid/Electric Vehicle?

- The cost of repair can vary depending on the exact cause of the fault, parts needed for replacement, and labor charges. It is recommended to get a diagnostic and repair estimate from a trusted automotive service center.

8. Can the OBDII code P1B4A be a false alarm in a Cadillac Hybrid/Electric Vehicle?

- While false alarms are possible, it is crucial to investigate the root cause of the fault code thoroughly to ensure the hybrid/electric system's proper functioning and safety.

9. What are the potential risks of ignoring the OBDII code P1B4A in a Cadillac Hybrid/Electric Vehicle?

- Ignoring this fault code can lead to further damage to the high voltage circuit, potential safety hazards, and decreased performance of the hybrid/electric system.

10. How often should I have the high voltage system in my Cadillac Hybrid/Electric Vehicle inspected to prevent OBDII code P1B4A issues?

- Regular maintenance and inspections of the high voltage system, as recommended by the manufacturer, can help prevent issues like the P1B4A fault code and ensure the vehicle's overall health and performance.