AutoCodes – Buick – P1E4C Buick

P1E4C Buick Code - Hybrid/Electric Vehicle Battery 33 Circuit

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: P1E4C Buick indicates Hybrid/Electric Vehicle Battery 33 Circuit.
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 818

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 23, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1E4C Buick 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 P1E4C Buick - Hybrid/Electric Vehicle Battery 33 Circuit - AutoCodes.com — P1E4C Buick Code - Hybrid/Electric Vehicle Battery 33 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E4C Buick?

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

How to Fix the DTC P1E4C 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 P1E4C 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 P1E4C Buick Code

1. What does the OBDII code P1E4C mean on a Buick?

The P1E4C code indicates a problem with the Hybrid/Electric Vehicle Battery 33 Circuit, typically involving a fault in the battery's monitoring or control system.

2. What are common symptoms of a P1E4C code in a Buick?

Symptoms may include the check engine light turning on, reduced fuel efficiency, limited EV mode functionality, or the vehicle entering limp mode.

3. What causes the P1E4C code to appear in a Buick?

Common causes include a faulty battery sensor, damaged wiring or connectors in the battery circuit, or an issue with the hybrid battery control module.

4. Can I drive my Buick with the P1E4C code?

It is not recommended to drive with this code, as it may indicate a serious issue with the hybrid battery system that could affect performance and safety.

5. How do I diagnose a P1E4C code on a Buick?

Use a diagnostic scanner to verify the code and inspect the battery circuit wiring, connectors, and sensors for damage or loose connections.

6. How do I fix the P1E4C code on a Buick?

Repairs may include replacing damaged wires, securing loose connectors, or replacing a faulty hybrid battery control module or sensor.

7. Is the P1E4C code specific to Buick hybrid or electric vehicles?

Yes, this code is specific to hybrid or electric Buick models and pertains to the battery circuit functionality.

8. Can a weak 12V battery cause the P1E4C code?

While unlikely, a failing 12V battery can sometimes trigger hybrid system issues. Itâ€™s worth checking the 12V battery's condition as part of the diagnosis.

9. How much does it cost to fix the P1E4C code on a Buick?

Repair costs vary depending on the issue, ranging from $100 for wiring repairs to $1,000 or more if the hybrid battery control module needs replacement.

10. Do I need a professional to fix the P1E4C code on my Buick?

Due to the complexity of hybrid systems, itâ€™s recommended to have a qualified technician diagnose and repair the issue to ensure safety and accuracy.