AutoCodes – GMC – P101E 2018 GMC Sierra

P101E 2018 GMC Sierra Code - Glow Plug Control Module Temperature Sensor 3 Circuit High Voltage

Quick Answer

The Glow Plug Control Module (GPCM) has the ability to perform internal diagnostics for the temperature sensor circuit. Common causes include Faulty Glow Plug Control Module (GPCM), Glow Plug Control Module harness is open or shorted, Glow Plug Control 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: P101E 2018 GMC Sierra indicates Glow Plug Control Module Temperature Sensor 3 Circuit High Voltage.
Common causes: Common causes include Faulty Glow Plug Control Module (GPCM), Glow Plug Control Module harness is open or shorted, Glow Plug Control 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 251

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Oct 01, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P101E 2018 GMC Sierra Description

The Glow Plug Control Module (GPCM) has the ability to perform internal diagnostics for the temperature sensor circuit. The GPCM monitors the internal temperature sensor voltage and if the voltage is less than 0.21 V or greater than 4.94 V. The GPCM will send a message to the Engine Control Module (ECM) to set the appropriate Diagnostic Trouble Code (DTC). A DTC is detected when one of the GPCM temperature sensors voltage falls outside the calibrated threshold for greater than 1.3 s.

OBDII Code P101E 2018 GMC Sierra - Glow Plug Control Module Temperature Sensor 3 Circuit High Voltage - AutoCodes.com — P101E 2018 GMC Sierra Code - Glow Plug Control Module Temperature Sensor 3 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P101E 2018 GMC Sierra?

Faulty Glow Plug Control Module (GPCM)
Glow Plug Control Module harness is open or shorted
Glow Plug Control Module circuit poor electrical connection

How to Fix the DTC P101E 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 P101E 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.

Need more information about the P101E 2018 GMC Sierra code?

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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 P101E 2018 GMC Sierra Code

What does the OBDII code P101E mean on a 2018 GMC Sierra?

P101E indicates an issue with the Glow Plug Control Module Temperature Sensor 3 Circuit, specifically detecting high voltage beyond the expected range.

What are the common symptoms of code P101E on a 2018 GMC Sierra?

Symptoms may include difficulty starting the engine in cold weather, poor engine performance, an illuminated check engine light, or reduced fuel efficiency.

What causes the P101E code to appear?

Potential causes include a faulty temperature sensor, damaged wiring or connectors in the Glow Plug Control Module circuit, or a malfunctioning Glow Plug Control Module itself.

Can I still drive my GMC Sierra with the P101E code?

While the vehicle may still be drivable, it could experience performance issues, particularly in cold weather. Itâ€™s best to address the issue promptly to avoid further complications.

How do I diagnose the P101E code?

Diagnosis involves inspecting the wiring and connectors for damage, testing the temperature sensor with a multimeter, and verifying the Glow Plug Control Module's functionality using a scan tool.

How can I fix the P101E code on my GMC Sierra?

Repairs may include replacing a faulty temperature sensor, repairing damaged wiring or connectors, or replacing the Glow Plug Control Module if itâ€™s defective.

What tools are needed to troubleshoot the P101E code?

Common tools include a diagnostic scan tool, a multimeter for testing voltage and resistance, and possibly wiring repair supplies like connectors or heat shrink tubing.

How much does it cost to fix the P101E code?

The cost varies depending on the root cause. Replacing a temperature sensor typically costs $50-$150, while Glow Plug Control Module replacement could range from $200-$500, plus labor.

Could a dead battery cause the P101E code?

A dead or weak battery is unlikely to directly cause P101E but could exacerbate electrical issues, making it harder to diagnose or resolve the problem.

Is the P101E code covered under warranty for a 2018 GMC Sierra?

It depends on your warranty coverage. If the vehicle is still under the powertrain or emissions warranty, the repair may be covered. Check with your dealer for details.