AutoCodes – Cadillac – P1E03 Cadillac

P1E03 Cadillac Code - Hybrid/Electric Vehicle Battery 95 Circuit High Voltage

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: P1E03 Cadillac indicates Hybrid/Electric Vehicle Battery 95 Circuit High Voltage.
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 863

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 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1E03 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 P1E03 Cadillac - Hybrid/Electric Vehicle Battery 95 Circuit High Voltage - AutoCodes.com — P1E03 Cadillac Code - Hybrid/Electric Vehicle Battery 95 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1E03 Cadillac?

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

How to Fix the DTC P1E03 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 P1E03 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 P1E03 Cadillac Code

What does the OBDII code P1E03 mean for my Cadillac?

P1E03 indicates that there is a high voltage issue in the Hybrid/Electric Vehicle Battery 95 circuit, which could affect the vehicle's hybrid system performance.

What symptoms might I notice if my vehicle has the P1E03 code?

Common symptoms include warning lights on the dashboard, reduced engine power, poor fuel efficiency, and the vehicle may enter limp mode to protect the battery.

What could cause the P1E03 code to trigger in my Cadillac?

Possible causes include damaged wiring or connectors in the battery circuit, a failing battery management system, or a malfunctioning battery pack.

How can I diagnose the issue related to the P1E03 code?

You can start by inspecting the battery connections and wiring for any visible damage, then use an OBDII scanner to check for additional codes or freeze frame data that might help pinpoint the issue.

Is it safe to drive my Cadillac if the P1E03 code is present?

While it may be safe for short distances, it is recommended to avoid driving the vehicle too much until the issue is diagnosed and resolved, as it may affect the vehicle's hybrid performance.

What repairs might be necessary if I get the P1E03 code?

Repairs may range from repairing or replacing damaged wiring or connectors to servicing or replacing the battery pack or battery management system.

Can I reset the P1E03 code myself, or do I need a mechanic?

You can reset the code with an OBDII scanner, but if the underlying issue isn't resolved, the code will likely return, so it's best to have a professional diagnose the problem.

How much might it cost to fix the P1E03 code in my Cadillac?

Repair costs can vary widely depending on the specific issue, but diagnosing and repairing hybrid battery systems can range from a few hundred to several thousand dollars.

Will clearing the P1E03 code fix the underlying problem?

No, clearing the code will not fix the underlying issue. It only temporarily removes the warning, and the code will likely reappear if the problem persists.