AutoCodes – GMC – P1E74 GMC

P1E74 GMC 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 GMC 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 806

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

What does this mean?

What are the Possible Causes of the DTC P1E74 GMC?

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

How to Fix the DTC P1E74 GMC?

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 GMC 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 GMC Code

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

P1E74 indicates an issue with the Hybrid/Electric Vehicle Battery 73 Circuit, typically related to voltage inconsistencies or communication problems in the hybrid battery system.

2. What are common symptoms of the P1E74 code in a GMC vehicle?

Symptoms may include a check engine light, reduced power mode, decreased fuel efficiency, or a warning related to the hybrid system on the dashboard.

3. What causes the P1E74 code to appear?

Common causes include a malfunctioning hybrid battery module, damaged wiring or connectors in the battery circuit, or a fault in the battery energy control module.

4. Can I drive my GMC with the P1E74 code active?

While the vehicle may still be drivable, itâ€™s not recommended due to the potential for reduced performance or further damage to the hybrid system.

5. How is the P1E74 code diagnosed in a GMC?

A technician will use an advanced scan tool to check for related codes, inspect the hybrid battery system components, and test the wiring and connectors of the 73 circuit.

6. How do I fix the P1E74 code on my GMC vehicle?

Repairs may involve replacing a faulty hybrid battery module, repairing or replacing damaged wiring, or reprogramming the battery energy control module.

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

Repair costs vary widely but may range from $200 to $4,000, depending on whether the issue is a minor wiring repair or a hybrid battery replacement.

8. Can a weak 12-volt battery trigger the P1E74 code?

While unlikely, a weak or failing 12-volt battery can sometimes cause communication errors in the hybrid system, indirectly contributing to diagnostic trouble codes.

9. What tools are needed to troubleshoot the P1E74 code on a GMC?

Diagnosing this code typically requires an advanced OBDII scan tool capable of reading hybrid system codes and a multimeter for testing electrical circuits.

10. Is the P1E74 code specific to GMC vehicles?

While the code format is standardized, the P1E74 code and its exact meaning are specific to GMC and other General Motors hybrid vehicles.