AutoCodes – Cadillac – P1E72 Cadillac

P1E72 Cadillac Code - Hybrid/Electric Vehicle Battery 71 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: P1E72 Cadillac indicates Hybrid/Electric Vehicle Battery 71 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 888

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 P1E72 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 P1E72 Cadillac - Hybrid/Electric Vehicle Battery 71 Circuit - AutoCodes.com — P1E72 Cadillac Code - Hybrid/Electric Vehicle Battery 71 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E72 Cadillac?

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

How to Fix the DTC P1E72 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 P1E72 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 P1E72 Cadillac Code

1. What are the common symptoms of OBDII code P1E72 in a Cadillac Hybrid/Electric Vehicle related to the Hybrid/Electric Vehicle Battery 71 Circuit?

- Common symptoms include reduced electric range, poor acceleration, and a warning light on the dashboard indicating an issue with the hybrid/electric battery system.

2. What are the possible causes of OBDII code P1E72 in a Cadillac Hybrid/Electric Vehicle?

- The code P1E72 can be triggered by issues such as a faulty battery cell, damaged wiring in the Hybrid/Electric Vehicle Battery 71 Circuit, or a malfunctioning battery management system.

3. How can I diagnose the Hybrid/Electric Vehicle Battery 71 Circuit issue causing OBDII code P1E72 in my Cadillac?

- Diagnosing the problem may require a professional scan tool to read the specific fault codes, as well as testing the battery cells, checking the wiring for damage, and inspecting the battery management system.

4. Can I continue driving my Cadillac with OBDII code P1E72 present?

- It is not recommended to continue driving the vehicle with the code P1E72 active, as it indicates a potential issue with the hybrid/electric battery system that could lead to further damage or safety concerns.

5. How can I reset OBDII code P1E72 in my Cadillac Hybrid/Electric Vehicle?

- Simply resetting the code without addressing the underlying issue will not solve the problem. It is important to diagnose and repair the root cause of the code to prevent it from reoccurring.

6. Is it safe to attempt DIY repairs for OBDII code P1E72 in a Cadillac Hybrid/Electric Vehicle?

- Due to the complexity of hybrid/electric vehicle systems and the high voltage present in the battery, it is recommended to seek professional assistance for diagnosing and repairing issues related to code P1E72.

7. What repair options are available for resolving OBDII code P1E72 in a Cadillac Hybrid/Electric Vehicle?

- Repair options may include replacing faulty battery cells, repairing damaged wiring in the Hybrid/Electric Vehicle Battery 71 Circuit, or recalibrating the battery management system to resolve the issue.

8. How much does it typically cost to repair OBDII code P1E72 in a Cadillac Hybrid/Electric Vehicle?

- The cost of repairs for code P1E72 can vary depending on the extent of the issue, the parts needed for repair, and the labor rates of the service provider. It is advisable to obtain quotes from different shops for comparison.

9. Will fixing OBDII code P1E72 improve the overall performance and efficiency of my Cadillac Hybrid/Electric Vehicle?

- Resolving code P1E72 and ensuring the proper functioning of the Hybrid/Electric Vehicle Battery 71 Circuit can help restore the performance and efficiency of the vehicle's hybrid/electric system.

10. How often should I have the hybrid/electric battery system in my Cadillac inspected to prevent issues like OBDII code P1E72?

- Regular maintenance and inspections of the hybrid/electric battery system, including checking for any fault codes, should be performed according to the manufacturer's recommended schedule to prevent issues like code P1E72 from occurring.