AutoCodes – Cadillac – P1E7C Cadillac

P1E7C Cadillac 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 Cadillac 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 831

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

What does this mean?

What are the Possible Causes of the DTC P1E7C Cadillac?

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

How to Fix the DTC P1E7C Cadillac?

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 Cadillac 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 Cadillac Code

1. What are the common symptoms of OBDII code P1E7C in a Cadillac Hybrid/Electric Vehicle?

- Common symptoms include reduced hybrid/electric powertrain performance, illuminated warning lights on the dashboard, and possible issues with battery charging.

2. What can cause the OBDII code P1E7C to trigger in a Cadillac Hybrid/Electric Vehicle?

- The code P1E7C typically triggers due to a malfunction or fault in the Hybrid/Electric Vehicle Battery 81 Circuit. This can be caused by issues with battery cell modules, wiring, connectors, or the battery management system.

3. How serious is the OBDII code P1E7C in a Cadillac Hybrid/Electric Vehicle?

- The code P1E7C should be addressed promptly as it can affect the performance and efficiency of the hybrid/electric powertrain. Ignoring the issue may lead to further damage to the battery system.

4. What are some DIY repair tips for addressing the OBDII code P1E7C in a Cadillac Hybrid/Electric Vehicle?

- DIY repair tips may include checking and cleaning battery terminals, inspecting wiring harnesses for damage, and resetting the battery management system. However, it is recommended to consult a professional for a thorough diagnosis and repair.

5. Can driving with the OBDII code P1E7C in a Cadillac Hybrid/Electric Vehicle cause further damage?

- Continuing to drive with the code P1E7C may worsen the condition of the Hybrid/Electric Vehicle Battery 81 Circuit and lead to decreased battery performance or potential safety risks. It is advisable to have the issue diagnosed and repaired promptly.

6. How can a professional diagnose the OBDII code P1E7C in a Cadillac Hybrid/Electric Vehicle?

- A professional technician can diagnose the code P1E7C using a scan tool to retrieve specific fault codes, conduct a visual inspection of the battery system components, and perform electrical tests to pinpoint the exact issue.

7. Is it safe to reset the OBDII code P1E7C in a Cadillac Hybrid/Electric Vehicle without addressing the underlying problem?

- While resetting the code may temporarily clear the warning light, it will not fix the root cause of the issue. It is important to address the underlying problem to ensure the proper functioning of the hybrid/electric system.

8. How much does it typically cost to repair the OBDII code P1E7C in a Cadillac Hybrid/Electric Vehicle?

- The cost of repairing the code P1E7C can vary depending on the extent of the issue and the specific repairs needed. Costs may include parts replacement, labor charges, and diagnostic fees.

9. Can the OBDII code P1E7C be prevented in a Cadillac Hybrid/Electric Vehicle?

- Regular maintenance and inspections of the hybrid/electric system, as well as keeping the battery system clean and well-maintained, can help prevent issues that may trigger the code P1E7C.

10. How long does it take to repair the OBDII code P1E7C in a Cadillac Hybrid/Electric Vehicle?

- The repair time for the code P1E7C can vary depending on the complexity of the issue and the availability of parts. It is recommended to consult with a professional technician for an accurate estimate of the repair duration.