AutoCodes – Generic – P1E7C

P1E7C 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 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 1,104

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

What does this mean?

What are the Possible Causes of the DTC P1E7C?

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

How to Fix the DTC P1E7C?

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 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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Need Help with the Code?

Get the P1E7C code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1E7C Buick — Hybrid/Electric Vehicle Battery 81 Circuit
P1E7C Cadillac — Hybrid/Electric Vehicle Battery 81 Circuit
P1E7C Chevrolet — Hybrid/Electric Vehicle Battery 81 Circuit
P1E7C GMC — Hybrid/Electric Vehicle Battery 81 Circuit
P1E7C Saturn — Hybrid/Electric Vehicle Battery 81 Circuit

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 Code

1. What does the OBDII code P1E7C mean?

The P1E7C code refers to a fault in the Hybrid/Electric Vehicle Battery 81 Circuit, which typically involves an issue with monitoring or communication in the battery system.

2. What are the common symptoms of the P1E7C code?

Symptoms may include reduced vehicle performance, warning lights on the dashboard (such as the check engine light or hybrid system warning), and limited electric-only driving range.

3. What causes the P1E7C code to appear?

Possible causes include a malfunctioning battery sensor, damaged wiring or connectors in the battery circuit, or a fault in the hybrid battery control module.

4. Can I continue driving with the P1E7C code?

Driving with this code is not recommended, as it may lead to further damage to the battery system or reduced hybrid functionality. Seek professional diagnosis and repair promptly.

5. How is the P1E7C code diagnosed?

A technician will use a scan tool to retrieve the code, inspect the hybrid battery system, check for damaged wiring or connectors, and test the battery control module for proper operation.

6. What repairs are needed to fix the P1E7C code?

Repairs may include replacing a faulty battery sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the hybrid battery control module.

7. How much does it cost to fix the P1E7C code?

Repair costs vary depending on the issue but can range from $200 for minor wiring repairs to over $1,000 if the hybrid battery control module needs replacement.

8. Can a weak hybrid battery trigger the P1E7C code?

Yes, a degraded or failing hybrid battery can contribute to circuit faults and may trigger this code.

9. Will resetting the code fix the problem?

Clearing the code without addressing the underlying issue will not resolve the problem, and the code is likely to return.

10. Is the P1E7C code specific to certain vehicles?

This code is generally associated with hybrid or electric vehicles and may be found in models from manufacturers like Chevrolet, Toyota, and others that use hybrid systems.