AutoCodes – Buick – P1E4D Buick

P1E4D Buick Code - Hybrid/Electric Vehicle Battery 34 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: P1E4D Buick indicates Hybrid/Electric Vehicle Battery 34 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 943

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 P1E4D 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 P1E4D Buick - Hybrid/Electric Vehicle Battery 34 Circuit - AutoCodes.com — P1E4D Buick Code - Hybrid/Electric Vehicle Battery 34 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E4D Buick?

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

How to Fix the DTC P1E4D 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 P1E4D 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 P1E4D Buick Code

1. What does the OBDII code P1E4D mean on a Buick?

P1E4D indicates an issue with the Hybrid/Electric Vehicle Battery 34 Circuit, which monitors the voltage or performance of a specific part of the hybrid battery system.

2. What are the common symptoms of the P1E4D code in a Buick?

Common symptoms include a check engine light, reduced hybrid system performance, limited acceleration, or a warning about the hybrid battery system on the dashboard.

3. What causes the P1E4D code to appear in a Buick?

This code can be caused by a faulty battery cell, a wiring issue, a damaged battery control module, or poor electrical connections within the battery circuit.

4. Can I drive my Buick with the P1E4D code active?

While the vehicle may still be drivable, it is not recommended as it could lead to further damage to the hybrid battery system or reduced performance.

5. How do you diagnose the P1E4D code on a Buick?

A mechanic will use a scan tool to read the code, inspect battery connections, test the circuit for voltage or resistance discrepancies, and check for any damaged components.

6. How is the P1E4D code fixed in a Buick?

Repairs may include replacing faulty battery cells, repairing wiring or connectors, updating software, or replacing the hybrid battery control module if necessary.

7. How much does it cost to fix the P1E4D code on a Buick?

The repair cost depends on the issue. Minor wiring repairs may cost a few hundred dollars, while hybrid battery replacements can cost several thousand dollars.

8. Can a dead 12V battery cause the P1E4D code in a Buick?

A weak or dead 12V battery can sometimes trigger hybrid system errors, but the P1E4D code specifically relates to the high-voltage hybrid battery circuit.

9. Does the P1E4D code mean my hybrid battery needs replacement?

Not necessarily. The code indicates a circuit issue, which could be caused by wiring, connectors, or a specific battery cell, not necessarily the entire battery pack.

10. Will clearing the P1E4D code solve the issue in my Buick?

Clearing the code will reset the warning temporarily, but if the underlying issue isnâ€™t fixed, the code will likely reappear.