AutoCodes – GMC – P1E56 GMC

P1E56 GMC 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 GMC 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 764

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

What does this mean?

What are the Possible Causes of the DTC P1E56 GMC?

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

How to Fix the DTC P1E56 GMC?

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 GMC 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 GMC Code

What does the P1E56 code mean on a GMC vehicle?

The P1E56 code indicates an issue with the Hybrid/Electric Vehicle Battery 43 Circuit, which relates to a specific cell or module in the high-voltage battery system.

What are the common symptoms of the P1E56 code?

Symptoms may include an illuminated check engine light, reduced hybrid or EV performance, limited driving range, or the vehicle entering limp mode.

What causes the P1E56 code to appear?

Common causes include a faulty battery module, damaged wiring or connectors in the battery circuit, or a malfunctioning battery control module.

Can I drive my GMC vehicle with the P1E56 code?

While the vehicle may still be drivable, continuing to drive with this code can lead to further damage. Reduced performance or safety risks may occur, so itâ€™s best to address the issue promptly.

How is the P1E56 code diagnosed?

A technician will use a scan tool to retrieve the code, then inspect the battery circuit, wiring, and connectors. They may also test the voltage and resistance of the affected battery module.

What repairs can fix the P1E56 code?

Repairs may include replacing a defective battery module, repairing or replacing damaged wiring or connectors, or reprogramming the battery control module if needed.

Is the P1E56 code covered under warranty?

Depending on your vehicleâ€™s warranty, issues related to the hybrid or EV battery may be covered. Check with your GMC dealer for warranty details.

Can a weak 12-volt battery trigger the P1E56 code?

While unlikely, a weak 12-volt battery can occasionally cause communication issues between control modules, which might indirectly contribute to this code. Testing the 12-volt battery is recommended.

What tools are needed to diagnose the P1E56 code?

A professional-grade OBDII scan tool capable of reading hybrid or EV-specific codes and live data is essential, along with a multimeter for electrical testing.

How much does it cost to repair the P1E56 code?

Repair costs vary widely depending on the specific issue. Replacing a battery module can cost several hundred to a few thousand dollars, while minor wiring repairs may be less expensive.