AutoCodes – Buick – P1E7C Buick

P1E7C Buick 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 Buick 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.

Save to My Repairs My Repairs

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

Code Popularity 694

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

What does this mean?

What are the Possible Causes of the DTC P1E7C Buick?

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

How to Fix the DTC P1E7C 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 P1E7C 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.

Need more information about the P1E7C Buick code?

Need more information on how to fix the P1E7C Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

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

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 Buick Code

1. What are the common symptoms of OBDII code P1E7C Buick related to the Hybrid/Electric Vehicle Battery 81 Circuit?

- Common symptoms include poor battery performance, reduced electric range, and potential issues with hybrid system functionality.

2. What are the possible causes of OBDII code P1E7C Buick indicating an issue with the Hybrid/Electric Vehicle Battery 81 Circuit?

- Possible causes include damaged wiring, faulty battery connections, issues with battery temperature sensors, or a malfunctioning battery control module.

3. How can I diagnose the Hybrid/Electric Vehicle Battery 81 Circuit issue triggering OBDII code P1E7C Buick?

- Diagnosis typically involves using a scan tool to read the code, checking battery connections, inspecting wiring for damage, and testing battery temperature sensors.

4. Can a DIY enthusiast repair OBDII code P1E7C Buick related to the Hybrid/Electric Vehicle Battery 81 Circuit?

- Repairing this issue may require advanced knowledge and tools, so it is recommended to seek assistance from a qualified technician familiar with hybrid/electric vehicles.

5. What are some tips for preventing the recurrence of OBDII code P1E7C Buick linked to the Hybrid/Electric Vehicle Battery 81 Circuit?

- Regularly inspecting battery connections, ensuring proper maintenance of the hybrid system, and addressing any warning signs promptly can help prevent this code from reoccurring.

6. Is it safe to continue driving my Buick with OBDII code P1E7C indicating a problem with the Hybrid/Electric Vehicle Battery 81 Circuit?

- It is recommended to avoid driving the vehicle if you notice significant issues with battery performance or the hybrid system, as continued driving may worsen the problem.

7. How much does it typically cost to repair OBDII code P1E7C Buick associated with the Hybrid/Electric Vehicle Battery 81 Circuit?

- Repair costs can vary depending on the exact cause of the issue, but it is advisable to budget for potentially significant expenses related to diagnosing and fixing this problem.

8. Can a weak or failing battery be the root cause of OBDII code P1E7C Buick in a Buick hybrid/electric vehicle?

- Yes, a weak or failing battery can contribute to triggering this code, especially if it affects the overall performance of the Hybrid/Electric Vehicle Battery 81 Circuit.

9. Are there any recalls or technical service bulletins related to OBDII code P1E7C Buick concerning the Hybrid/Electric Vehicle Battery 81 Circuit?

- It is advisable to check with Buick or authorized service centers for any recalls or technical service bulletins specifically addressing issues related to this OBDII code in hybrid/electric vehicles.

10. How long does it typically take to repair OBDII code P1E7C Buick associated with the Hybrid/Electric Vehicle Battery 81 Circuit?

- The repair time can vary based on the complexity of the issue and the availability of parts, but it is recommended to consult with a technician for a more accurate estimate.