AutoCodes – Cadillac – P1E74 Cadillac

P1E74 Cadillac Code - Hybrid/Electric Vehicle Battery 73 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: P1E74 Cadillac indicates Hybrid/Electric Vehicle Battery 73 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 688

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 P1E74 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 P1E74 Cadillac - Hybrid/Electric Vehicle Battery 73 Circuit - AutoCodes.com — P1E74 Cadillac Code - Hybrid/Electric Vehicle Battery 73 Circuit

What does this mean?

What are the Possible Causes of the DTC P1E74 Cadillac?

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

How to Fix the DTC P1E74 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 P1E74 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 P1E74 Cadillac Code

1. What does the OBDII code P1E74 mean on a Cadillac?

Code P1E74 indicates an issue with the Hybrid/Electric Vehicle (HEV) Battery 73 Circuit, which typically relates to a fault in the battery management system or a specific battery cell's circuit.

2. What are common symptoms of code P1E74 in a Cadillac?

Symptoms may include an illuminated check engine light, reduced hybrid or electric driving performance, limited power mode, or warnings related to the battery system on the instrument cluster.

3. What causes the P1E74 code to appear?

The code can be triggered by a faulty battery cell, damaged wiring or connectors in the battery circuit, a malfunctioning battery management module, or issues with voltage sensing.

4. Can I drive my Cadillac with a P1E74 code?

While the vehicle may still be drivable, it is not recommended as the code indicates an issue with the hybrid/electric battery system, which could lead to further damage or reduced performance.

5. How do technicians diagnose a P1E74 code?

Technicians use a scan tool to retrieve the code, inspect the battery system for physical damage, test the battery voltage and circuitry, and check for additional related codes.

6. What repairs can fix the P1E74 code?

Repairs may include replacing a faulty battery cell, repairing or replacing damaged wiring or connectors, updating or reprogramming the battery control module, or replacing the module if necessary.

7. How much does it cost to fix a P1E74 code on a Cadillac?

Repair costs vary widely depending on the exact issue but can range from $200 for wiring repairs to several thousand dollars if the battery pack or control module requires replacement.

8. Can a P1E74 code clear itself?

No, this code typically does not clear itself. The underlying issue must be resolved, and the system may need to be reset with a scan tool.

9. Is the P1E74 code common for all Cadillacs?

No, this code is specific to Cadillac hybrid or electric models equipped with battery management systems. It is not applicable to traditional gasoline-only vehicles.

10. Can a dead 12V battery cause a P1E74 code?

A weak or dead 12V battery may not directly cause this code but can lead to related electrical issues that may affect the battery control system. Always ensure the 12V battery is in good condition.