AutoCodes – Buick – P1E7E Buick

P1E7E Buick Code - Hybrid/Electric Vehicle Battery 83 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: P1E7E Buick indicates Hybrid/Electric Vehicle Battery 83 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 1,301

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 P1E7E 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 P1E7E Buick - Hybrid/Electric Vehicle Battery 83 Circuit - AutoCodes.com — P1E7E Buick Code - Hybrid/Electric Vehicle Battery 83 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E7E Buick?

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

How to Fix the DTC P1E7E 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 P1E7E 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 P1E7E Buick Code

1. What does the OBD-II code P1E7E mean on a Buick?

The code P1E7E indicates an issue with the Hybrid/Electric Vehicle Battery 83 Circuit, often related to a communication or performance fault in the specific battery cell or module.

2. What are the common symptoms of the P1E7E code?

Symptoms may include an illuminated check engine light, reduced hybrid system performance, decreased fuel efficiency, or the vehicle entering a limp mode.

3. What causes the P1E7E code to appear?

Common causes include a faulty battery module, damaged wiring or connectors in the battery circuit, a failed battery management system, or software-related issues.

4. Can I drive my Buick with the P1E7E code active?

While the vehicle may still be drivable, it is not recommended as the hybrid system's performance could be compromised, and it may lead to further damage.

5. How do you diagnose a P1E7E code?

A technician will use a scan tool to check for related codes, inspect the battery circuit wiring and connectors, test the affected battery module, and verify the operation of the battery management system.

6. Is the P1E7E code specific to Buick vehicles?

While the code is most commonly associated with Buick hybrid or electric models, other GM vehicles using similar battery systems might also display this code.

7. How much does it cost to fix the P1E7E code?

Repair costs can vary widely, ranging from $200 for minor wiring repairs to over $1,000 if the battery module or control unit needs replacement.

8. Can a low-voltage accessory battery cause the P1E7E code?

Itâ€™s uncommon, but a weak or failing 12V battery can sometimes contribute to communication errors that trigger this code. Testing the 12V battery is part of the diagnostic process.

9. Can the P1E7E code be fixed with a software update?

In some cases, a software update for the battery management system may resolve the issue, but this depends on the root cause of the problem.

10. What preventative measures can I take to avoid the P1E7E code?

Regular maintenance of the battery system, such as inspecting wiring for damage and ensuring proper battery cooling, can help prevent issues leading to this code.