AutoCodes – Buick – P1E55 Buick

P1E55 Buick Code - Hybrid/Electric Vehicle Battery 42 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: P1E55 Buick indicates Hybrid/Electric Vehicle Battery 42 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 802

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 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1E55 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 P1E55 Buick - Hybrid/Electric Vehicle Battery 42 Circuit - AutoCodes.com — P1E55 Buick Code - Hybrid/Electric Vehicle Battery 42 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E55 Buick?

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

How to Fix the DTC P1E55 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 P1E55 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 P1E55 Buick Code

What does the OBDII code P1E55 on a Buick mean?

P1E55 indicates a problem with the Hybrid/Electric Vehicle Battery 42 Circuit, which refers to a specific cell or voltage section within the high-voltage battery system.

What are the common symptoms of a P1E55 code in a Buick?

Symptoms may include a check engine light, reduced hybrid or electric performance, limited driving range, or the vehicle entering a "limp mode."

What causes the P1E55 code to appear on a Buick?

Common causes include a faulty battery cell, damaged wiring or connectors in the battery circuit, a malfunctioning battery control module, or degraded battery performance over time.

Can I drive my Buick with a P1E55 code?

Itâ€™s not recommended to drive the vehicle extensively with this code, as it may result in reduced performance or further damage to the hybrid/electric battery system.

How is the P1E55 code diagnosed?

A technician will use a diagnostic scanner to read the code, inspect the specific battery circuit, check for damaged wiring or connectors, and test the affected battery cells or module.

What repairs are needed to fix the P1E55 code?

Repairs may include replacing a faulty battery cell, repairing damaged wiring or connectors, reprogramming or replacing the battery control module, or replacing the entire battery pack in severe cases.

Can a weak 12-volt battery cause a P1E55 code?

While the 12-volt battery doesnâ€™t directly cause this code, a weak 12-volt battery can lead to communication issues or misdiagnosed problems within the high-voltage system.

How much does it cost to fix a P1E55 code on a Buick?

Repair costs vary depending on the issue but can range from $200â€“$500 for minor repairs like wiring fixes to over $1,000 for battery cell or module replacement, and significantly more for full battery replacement.

Is the P1E55 code covered under warranty on a Buick?

High-voltage battery components often have extended warranties, so check with your dealer to see if the repair is covered under your carâ€™s hybrid or electric system warranty.

Can clearing the P1E55 code with a scanner fix the problem?

Clearing the code may turn off the warning temporarily, but the underlying issue must be resolved to prevent the code from returning and causing further damage.