AutoCodes – GMC – P1E7C GMC

P1E7C GMC Code - Hybrid/Electric Vehicle Battery 81 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: P1E7C GMC indicates Hybrid/Electric Vehicle Battery 81 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 982

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 P1E7C 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 P1E7C GMC - Hybrid/Electric Vehicle Battery 81 Circuit - AutoCodes.com — P1E7C GMC Code - Hybrid/Electric Vehicle Battery 81 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E7C GMC?

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

How to Fix the DTC P1E7C 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 P1E7C 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 P1E7C GMC Code

What does the OBDII code P1E7C GMC mean?

Code P1E7C indicates an issue with the Hybrid/Electric Vehicle Battery 81 Circuit, which typically relates to a malfunction in the battery's electrical or communication system.

What are the common symptoms of code P1E7C on a GMC vehicle?

Symptoms may include reduced performance of the hybrid system, warning lights on the dashboard, decreased fuel efficiency, or limited electric driving range.

What causes the P1E7C code on a GMC hybrid or electric vehicle?

This code can be caused by wiring or connector issues, a malfunctioning battery module, faulty sensors, or problems with the battery control module.

Can I continue driving my GMC with the P1E7C code?

While the vehicle may still operate, driving with this code could lead to further damage to the hybrid or electric system. It's best to have it diagnosed and repaired promptly.

How is the P1E7C code diagnosed in GMC vehicles?

A technician will use a scan tool to confirm the code, inspect the battery circuit, check for faulty wiring or connections, and test the affected components.

What repairs are typically needed for code P1E7C on GMC vehicles?

Repairs may include fixing damaged wiring, replacing connectors, repairing or replacing the battery module, or reprogramming the battery control module.

Is the P1E7C code specific to GMC hybrid and electric vehicles?

Yes, this code is specific to GMC hybrid and electric vehicles and relates to their battery management system.

How much does it cost to repair the P1E7C code on a GMC vehicle?

Repair costs can vary widely depending on the specific issue, ranging from $100 for simple wiring fixes to over $1,000 for battery module replacement.

Can a dead 12V battery cause the P1E7C code in GMC vehicles?

While unlikely, a weak or dead 12V battery can sometimes affect the communication system, which might trigger related codes. A full diagnostic is necessary to confirm the cause.

How can I prevent the P1E7C code from appearing on my GMC vehicle?

Regular maintenance of the battery system, checking for corrosion or damage to wiring, and addressing warning signs early can help prevent this code from appearing.