AutoCodes – GMC – P1E1A 2018 GMC Sierra

P1E1A 2018 GMC Sierra Code - Auxiliary Transmission Fluid Pump Control Module System Voltage High

Quick Answer

The power inverter module, often referred to as the drive motor generator power inverter module, contains three motor control modules and the hybrid powertrain control module. Common causes include Faulty Power Inverter Module, Power Inverter Module harness is open or shorted, Power Inverter Module circuit poor electrical connection. 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: P1E1A 2018 GMC Sierra indicates Auxiliary Transmission Fluid Pump Control Module System Voltage High.
Common causes: Common causes include Faulty Power Inverter Module, Power Inverter Module harness is open or shorted, Power Inverter Module circuit poor electrical connection.
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 241

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 Jul 04, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1E1A 2018 GMC Sierra Description

The power inverter module, often referred to as the drive motor generator power inverter module, contains three motor control modules and the hybrid powertrain control module. Two of the motor control modules operate their respective drive motor generator based upon power inverter module commands. The third motor control module controls the auxiliary transmission fluid pump motor. The hybrid powertrain control module and the motor control modules share the power inverter module ignition voltage circuit, battery voltage circuits and chassis earth.

OBDII Code P1E1A 2018 GMC Sierra - Auxiliary Transmission Fluid Pump Control Module System Voltage High - AutoCodes.com — P1E1A 2018 GMC Sierra Code - Auxiliary Transmission Fluid Pump Control Module System Voltage High

What does this mean?

What are the Possible Causes of the DTC P1E1A 2018 GMC Sierra?

Faulty Power Inverter Module
Power Inverter Module harness is open or shorted
Power Inverter Module circuit poor electrical connection

How to Fix the DTC P1E1A 2018 GMC Sierra?

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 P1E1A 2018 GMC Sierra 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 P1E1A 2018 GMC Sierra Code

What does the OBDII code P1E1A mean for a 2018 GMC Sierra?

The P1E1A code indicates a high voltage issue in the Auxiliary Transmission Fluid Pump Control Module System.

What are the common symptoms of code P1E1A in a 2018 GMC Sierra?

Symptoms may include erratic shifting, overheating transmission, warning lights on the dashboard, or reduced vehicle performance.

What causes the P1E1A code to appear?

This code can be caused by a faulty auxiliary transmission fluid pump, damaged wiring, poor electrical connections, or a malfunctioning control module.

Can driving with code P1E1A damage my GMC Sierra?

Yes, continuing to drive with this code can lead to transmission overheating and long-term damage if the issue isn’t resolved.

How can I diagnose the P1E1A code on my GMC Sierra?

Start by inspecting the wiring and connectors for damage, test the auxiliary transmission fluid pump, and check the voltage levels in the control module circuit.

What tools are needed to troubleshoot P1E1A?

You’ll need an OBDII scanner, a multimeter, and possibly wiring diagrams to check the electrical system and pinpoint the issue.

How do I fix the P1E1A code on a 2018 GMC Sierra?

Repair or replace any damaged wiring, connectors, or the auxiliary transmission fluid pump. If the issue persists, the control module may need replacement.

Is the P1E1A code specific to transmission performance?

Yes, this code is directly related to the auxiliary transmission fluid pump system, which helps regulate transmission temperature and performance.

How much does it cost to repair the P1E1A code on a GMC Sierra?

Repair costs vary, but replacing the auxiliary transmission fluid pump could cost $300-$600, while control module replacement may exceed $500, depending on labor and parts.

Can a software update resolve the P1E1A code?

In some cases, a software update for the transmission control module may fix voltage-related issues, but this depends on the vehicle’s diagnostic findings.