AutoCodes – Buick – P1E4E Buick

P1E4E Buick Code - Hybrid/Electric Vehicle Battery 35 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: P1E4E Buick indicates Hybrid/Electric Vehicle Battery 35 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 849

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 P1E4E 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 P1E4E Buick - Hybrid/Electric Vehicle Battery 35 Circuit - AutoCodes.com — P1E4E Buick Code - Hybrid/Electric Vehicle Battery 35 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E4E Buick?

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

How to Fix the DTC P1E4E 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 P1E4E 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 P1E4E Buick Code

1. What does the OBDII code P1E4E mean on a Buick?

The P1E4E code indicates an issue with the Hybrid/Electric Vehicle Battery 35 Circuit, which typically relates to a fault in the high-voltage battery system or its associated wiring.

2. What are common symptoms of the P1E4E code on a Buick?

Symptoms may include a check engine light, reduced hybrid/electric vehicle performance, limited electric range, or the vehicle operating in a fail-safe or "limp" mode.

3. What causes the P1E4E code on a Buick?

Common causes include damaged or corroded wiring in the battery circuit, a faulty battery sensor, a malfunctioning battery control module, or an internal fault in the high-voltage battery.

4. Can I drive my Buick with the P1E4E code?

Driving with this code is not recommended, as it may lead to reduced performance, further damage to the hybrid system, or safety risks associated with the high-voltage battery.

5. How is the P1E4E code diagnosed on a Buick?

A technician will use a scan tool to retrieve the code, inspect the battery circuit wiring and connectors, and test the battery control module and related components for faults.

6. What repairs are needed to fix the P1E4E code?

Repairs may include replacing damaged wiring or connectors, replacing the battery control module, or repairing or replacing the high-voltage battery if it has an internal fault.

7. How much does it cost to fix the P1E4E code on a Buick?

Repair costs vary depending on the issue, ranging from $100â€“$300 for wiring repairs to several thousand dollars if the high-voltage battery needs to be replaced.

8. Can a dead 12-volt battery cause the P1E4E code?

While unlikely, a weak or dead 12-volt battery can sometimes cause issues with the hybrid system, so it's worth checking and replacing if necessary.

9. Is the P1E4E code covered under warranty?

High-voltage battery components may be covered under the hybrid/electric vehicle warranty, which is typically longer than the standard warranty. Check with your dealer for specific coverage details.

10. Can I clear the P1E4E code without repairs?

Clearing the code without addressing the underlying issue is not recommended, as the problem will likely return and could cause further damage or safety concerns.