AutoCodes – Cadillac – P1E4F Cadillac

P1E4F Cadillac Code - Hybrid/Electric Vehicle Battery 36 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: P1E4F Cadillac indicates Hybrid/Electric Vehicle Battery 36 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 1,312

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 Apr 23, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1E4F 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 P1E4F Cadillac - Hybrid/Electric Vehicle Battery 36 Circuit - AutoCodes.com — P1E4F Cadillac Code - Hybrid/Electric Vehicle Battery 36 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E4F Cadillac?

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

How to Fix the DTC P1E4F 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 P1E4F 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 P1E4F Cadillac Code

1. What does the OBDII code P1E4F mean on a Cadillac?

P1E4F indicates an issue with the Hybrid/Electric Vehicle Battery 36 Circuit, which may involve a fault in the high-voltage battery or its associated wiring and sensors.

2. What are the common symptoms of code P1E4F on a Cadillac?

Symptoms may include reduced performance, warning lights like the check engine light or hybrid system warning, difficulty starting, or limited electric drive functionality.

3. What causes the P1E4F code to appear on a Cadillac?

Common causes include a wiring issue, a failed battery module, a defective voltage sensor, or a problem with the vehicle's hybrid control module.

4. Can I drive my Cadillac with a P1E4F code?

Driving with this code is not recommended, as it may lead to further damage to the hybrid system and could result in reduced functionality or a complete breakdown.

5. How is the P1E4F code diagnosed on a Cadillac?

A technician will use a scan tool to pull the code, inspect the high-voltage battery components, check for wiring damage or loose connections, and test the hybrid system for voltage irregularities.

6. What repairs are necessary to fix code P1E4F on a Cadillac?

Repairs may include fixing or replacing damaged wiring, replacing a faulty battery module, recalibrating the hybrid control module, or replacing a defective voltage sensor.

7. How much does it cost to repair a P1E4F code on a Cadillac?

Costs vary based on the issue but can range from $200 for wiring repairs to over $2,000 for battery module replacement, depending on the severity of the problem.

8. Can a dead 12V battery cause the P1E4F code on a Cadillac?

While unlikely, a weak or dead 12V battery can sometimes trigger hybrid system errors, so itâ€™s worth checking its condition as part of the diagnosis.

9. Is the P1E4F code covered under warranty for a Cadillac?

Hybrid system components, including the high-voltage battery, are often covered under extended warranties, but coverage varies by model and year. Check with your dealer for details.

10. Can I reset the P1E4F code without repairs?

Clearing the code without addressing the underlying issue may temporarily turn off the warning, but the problem will likely return and could worsen over time.