AutoCodes – Buick – P1EA4 Buick

P1EA4 Buick Code - Hybrid/EV Battery Interface Control Module 4 Cell Balancing Circuit

Quick Answer

To maintain a similar state of charge on the cell groups, the hybrid/EV powertrain control module 2 looks at the cell group voltages and determines which cell groups need energy removed in order to maintain the battery groups at a similar state of charge. Common causes include Faulty Hybrid/EV Battery Interface Control Module, Hybrid/EV Battery Interface Control Module harness is open or shorted, Hybrid/EV Battery Interface Control Module circuit poor electrical connection. 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: P1EA4 Buick indicates Hybrid/EV Battery Interface Control Module 4 Cell Balancing Circuit.
Common causes: Common causes include Faulty Hybrid/EV Battery Interface Control Module, Hybrid/EV Battery Interface Control Module harness is open or shorted, Hybrid/EV Battery Interface Control Module circuit poor electrical connection.
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 747

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 Apr 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1EA4 Buick Description

To maintain a similar state of charge on the cell groups, the hybrid/EV powertrain control module 2 looks at the cell group voltages and determines which cell groups need energy removed in order to maintain the battery groups at a similar state of charge. This is known as cell balancing. There is a resistor wired in parallel with the cell group and a transistor switch in series with the resistor internal to the hybrid/EV battery interface control module. The hybrid/EV powertrain control module 2 sends a command to the hybrid/EV battery energy control module to begin cell balancing through the hybrid/EV battery interface control modules.

OBDII Code P1EA4 Buick - Hybrid/EV Battery Interface Control Module 4 Cell Balancing Circuit - AutoCodes.com — P1EA4 Buick Code - Hybrid/EV Battery Interface Control Module 4 Cell Balancing Circuit

What does this mean?

What are the Possible Causes of the DTC P1EA4 Buick?

Faulty Hybrid/EV Battery Interface Control Module
Hybrid/EV Battery Interface Control Module harness is open or shorted
Hybrid/EV Battery Interface Control Module circuit poor electrical connection

How to Fix the DTC P1EA4 Buick?

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 P1EA4 Buick 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 P1EA4 Buick Code

1. What does the OBDII code P1EA4 mean on a Buick?

P1EA4 indicates an issue with the Hybrid/EV Battery Interface Control Module 4 Cell Balancing Circuit, which monitors and balances the voltage across the hybrid or EV battery cells.

2. What are the common symptoms of code P1EA4?

Symptoms may include reduced fuel economy, illuminated check engine light, limited hybrid or EV functionality, and potential loss of vehicle performance.

3. What causes the P1EA4 code to appear?

The code can be triggered by a malfunctioning battery cell, a faulty battery interface control module, wiring issues, or poor connections in the battery balancing circuit.

4. Can I drive my Buick with a P1EA4 code?

While the vehicle may still be drivable, ignoring the code can lead to reduced performance or damage to the hybrid/EV battery system. Prompt diagnosis and repair are recommended.

5. How is the P1EA4 code diagnosed?

A technician will typically use a scan tool to verify the code, inspect the battery management system, check for faulty wiring, and test the cell balancing circuit.

6. What are the repair options for the P1EA4 code?

Repairs may involve replacing the faulty battery cell, repairing damaged wiring or connectors, or replacing the battery interface control module.

7. How much does it cost to fix the P1EA4 code on a Buick?

Repair costs vary depending on the exact issue but can range from $200 for minor wiring repairs to over $1,000 if a module or battery replacement is needed.

8. Can the P1EA4 code be cleared without repairing the issue?

Clearing the code without addressing the underlying problem will likely result in the code returning and could lead to further damage.

9. Is the P1EA4 code covered under warranty for my Buick?

If your vehicle's hybrid or EV components are still under warranty, this issue may be covered. Check with your dealership for details.

10. What maintenance can prevent the P1EA4 code?

Regular inspections of the hybrid/EV battery system, ensuring proper cooling, and addressing electrical issues promptly can help prevent this code from appearing.