AutoCodes – Cadillac – P1E4C Cadillac

P1E4C Cadillac Code - Hybrid/Electric Vehicle Battery 33 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: P1E4C Cadillac indicates Hybrid/Electric Vehicle Battery 33 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 749

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 P1E4C 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 P1E4C Cadillac - Hybrid/Electric Vehicle Battery 33 Circuit - AutoCodes.com — P1E4C Cadillac Code - Hybrid/Electric Vehicle Battery 33 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E4C Cadillac?

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

How to Fix the DTC P1E4C 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 P1E4C 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 P1E4C Cadillac Code

What does the OBDII code P1E4C mean on a Cadillac?

The P1E4C code indicates an issue with the Hybrid/Electric Vehicle Battery 33 Circuit, specifically related to the voltage, communication, or performance of a specific battery module or circuit.

What are the common symptoms of the P1E4C code?

Symptoms may include an illuminated check engine light, reduced hybrid or electric performance, decreased fuel efficiency, or the vehicle entering a limp mode.

What causes the P1E4C code to appear?

The code can be triggered by faulty battery sensors, damaged wiring or connectors in the battery circuit, a failed battery module, or issues with the battery control module.

Can I drive my Cadillac with the P1E4C code?

Driving with this code is not recommended as it can lead to reduced vehicle performance, potential battery damage, or failure of hybrid/electric functions.

How can I diagnose the P1E4C code?

Start by scanning the vehicle with an OBDII scanner to confirm the code, inspect the battery circuit wiring and connectors, and test the voltage and resistance of the affected module.

What tools are needed to repair the P1E4C code?

Tools may include an OBDII scanner, a multimeter for testing voltage and continuity, and possibly specialized tools for accessing the battery pack.

How is the P1E4C code fixed?

Repairs may involve replacing damaged wiring or connectors, repairing or replacing the battery module, or updating/reprogramming the battery control module.

Can a weak 12V battery cause the P1E4C code?

Yes, a weak or failing 12V auxiliary battery can sometimes cause communication errors or voltage inconsistencies, leading to this code.

Does the P1E4C code mean the entire battery needs replacement?

Not necessarily. The issue may be isolated to a single module or circuit within the battery pack, which can often be repaired without replacing the entire battery.

How much does it cost to fix the P1E4C code on a Cadillac?

Repair costs vary but may range from $200 for wiring repairs to over $1,000 if a battery module or control unit requires replacement.