AutoCodes – Cadillac – P1E79 Cadillac

P1E79 Cadillac Code - Hybrid/Electric Vehicle Battery 78 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: P1E79 Cadillac indicates Hybrid/Electric Vehicle Battery 78 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 983

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 P1E79 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 P1E79 Cadillac - Hybrid/Electric Vehicle Battery 78 Circuit - AutoCodes.com — P1E79 Cadillac Code - Hybrid/Electric Vehicle Battery 78 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E79 Cadillac?

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

How to Fix the DTC P1E79 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 P1E79 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 P1E79 Cadillac Code

1. What are common symptoms of OBDII code P1E79 in a Cadillac hybrid/electric vehicle?

- Common symptoms include a decrease in fuel efficiency, reduced power output, and a possible illuminated check engine light.

2. What does the OBDII code P1E79 indicate in a Cadillac hybrid/electric vehicle?

- The code P1E79 points to an issue with the Hybrid/Electric Vehicle Battery 78 Circuit in the vehicle.

3. What are some possible causes of the P1E79 trouble code in a Cadillac hybrid/electric vehicle?

- Possible causes include a faulty battery pack, damaged wiring or connectors, software issues, or issues with the battery management system.

4. How can I diagnose the cause of the P1E79 trouble code in my Cadillac hybrid/electric vehicle?

- Diagnosing the issue may involve conducting a visual inspection of the battery components, checking for loose connections, and using a diagnostic scanner to retrieve specific fault codes.

5. Can I continue driving my Cadillac with the P1E79 trouble code present?

- It is not recommended to drive the vehicle with the P1E79 code active, as it can lead to further damage to the hybrid/electric system.

6. What are some repair tips for addressing the P1E79 trouble code in a Cadillac hybrid/electric vehicle?

- Repair tips may include checking and tightening battery connections, inspecting for physical damage to the battery pack, and consulting a professional technician for further diagnosis and repair.

7. Is it safe to attempt DIY repairs for the P1E79 trouble code in a Cadillac hybrid/electric vehicle?

- Due to the complexity of hybrid/electric vehicle systems, it is recommended to seek professional assistance for diagnosing and repairing issues related to the P1E79 code.

8. How much does it typically cost to repair the Hybrid/Electric Vehicle Battery 78 Circuit issue in a Cadillac?

- The cost of repair can vary depending on the extent of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

9. Can resetting the trouble code with a diagnostic tool temporarily resolve the P1E79 issue in a Cadillac?

- Resetting the code may temporarily clear the check engine light, but it will not fix the underlying problem causing the P1E79 trouble code.

10. Are there any recalls or service bulletins related to the Hybrid/Electric Vehicle Battery 78 Circuit issue in Cadillac vehicles?

- It is advisable to check with a Cadillac dealership or the manufacturer's website for any relevant recalls or service bulletins related to the P1E79 trouble code.