AutoCodes – Generic – P1E7A

P1E7A Code - Hybrid/Electric Vehicle Battery 79 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: P1E7A indicates Hybrid/Electric Vehicle Battery 79 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 859

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1E7A 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 P1E7A - Hybrid/Electric Vehicle Battery 79 Circuit - AutoCodes.com — P1E7A Code - Hybrid/Electric Vehicle Battery 79 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E7A?

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

How to Fix the DTC P1E7A?

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 P1E7A 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.

Need more information about the P1E7A code?

Need more information on how to fix the P1E7A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1E7A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1E7A Buick — Hybrid/Electric Vehicle Battery 79 Circuit
P1E7A Cadillac — Hybrid/Electric Vehicle Battery 79 Circuit
P1E7A Chevrolet — Hybrid/Electric Vehicle Battery 79 Circuit
P1E7A GMC — Hybrid/Electric Vehicle Battery 79 Circuit
P1E7A Saturn — Hybrid/Electric Vehicle Battery 79 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 P1E7A Code

1. What does OBDII code P1E7A mean?

Code P1E7A refers to a fault in the Hybrid/Electric Vehicle Battery 79 Circuit, which monitors and manages the battery module's performance in a hybrid or electric vehicle.

2. What are the symptoms of code P1E7A?

Common symptoms include warning lights on the dashboard (such as the check engine light or hybrid system warning), reduced power, poor battery performance, or the vehicle failing to start.

3. What causes code P1E7A to appear?

Potential causes include a faulty battery module, damaged wiring or connectors in the Battery 79 Circuit, a defective battery management system (BMS), or software issues.

4. How is the P1E7A code diagnosed?

A technician will use a scan tool to confirm the code and inspect the wiring, connectors, and battery module for damage or irregularities. They may also test the battery management system and perform software updates if needed.

5. Can code P1E7A cause long-term damage?

If left unresolved, the issue could lead to further damage to the battery or other hybrid system components, potentially resulting in higher repair costs.

6. Is it safe to drive with code P1E7A?

Driving with this code is not recommended, as it may cause reduced vehicle performance or leave you stranded if the battery system fails completely.

7. How do you fix code P1E7A?

Repairs may involve replacing the faulty battery module, repairing damaged wiring or connectors, updating software, or reprogramming the battery management system.

8. Does the P1E7A code require battery replacement?

Not always. In some cases, the issue may be resolved by repairing the wiring or connectors, or addressing the BMS, without replacing the entire battery.

9. What tools are needed to diagnose code P1E7A?

A professional OBDII scan tool, multimeter for testing electrical circuits, and access to the vehicle's service manual are typically needed for diagnosis.

10. Can a software update fix code P1E7A?

Yes, if the issue is related to outdated or corrupted battery management software, a software update may resolve the problem.