AutoCodes – Buick – P1E56 Buick

P1E56 Buick Code - Hybrid/Electric Vehicle Battery 43 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: P1E56 Buick indicates Hybrid/Electric Vehicle Battery 43 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 1,135

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
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Code P1E56 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 P1E56 Buick - Hybrid/Electric Vehicle Battery 43 Circuit - AutoCodes.com — P1E56 Buick Code - Hybrid/Electric Vehicle Battery 43 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E56 Buick?

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

How to Fix the DTC P1E56 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 P1E56 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 P1E56 Buick Code

What does the OBDII code P1E56 mean for a Buick?

P1E56 indicates a problem with the Hybrid/Electric Vehicle Battery 43 Circuit, which can affect the performance and efficiency of the hybrid system.

What symptoms might indicate the P1E56 code is present?

Common symptoms include reduced hybrid system performance, warning lights on the dashboard, and potential issues with battery charging or discharging.

What are some potential causes of the P1E56 code?

Causes may include a faulty battery, damaged wiring in the battery circuit, poor connections, or issues with the battery management system.

How can I diagnose the P1E56 code effectively?

To diagnose the code, use an OBD-II scanner to confirm the code, visually inspect the battery and circuit connections, and check for any other related codes.

What repairs are typically needed to fix the P1E56 code?

Repairs may involve replacing a faulty hybrid battery, repairing damaged wiring, or addressing issues with the battery management system.

Can I drive my Buick with the P1E56 code?

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

How can I prevent the P1E56 code from occurring?

Regular maintenance, such as checking the hybrid battery connections and ensuring the battery is in good condition, can help prevent the occurrence of this code.

Is it safe to reset the P1E56 code without fixing the issue?

Resetting the code without addressing the underlying issue is not advisable, as it may result in further damage or a breakdown of the hybrid system.

What should I do if the P1E56 code keeps coming back after repairs?

If the code returns after repairs, it may indicate an underlying issue that wasn't fully resolved. Have a professional technician conduct a thorough diagnostic to identify any additional problems.