AutoCodes – GMC – P101D 2017 GMC Sierra

P101D 2017 GMC Sierra Code - Glow Plug Control Module Temperature Sensor 3 Circuit Low 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: P101D 2017 GMC Sierra indicates Glow Plug Control Module Temperature Sensor 3 Circuit Low 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 500

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 P101D 2017 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 P101D 2017 GMC Sierra - Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage - AutoCodes.com — P101D 2017 GMC Sierra Code - Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P101D 2017 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 P101D 2017 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 P101D 2017 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 P101D 2017 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 P101D 2017 GMC Sierra Code

What does the OBDII code P101D mean for a 2017 GMC Sierra?

P101D indicates a low voltage issue in the Glow Plug Control Module Temperature Sensor 3 Circuit, which is responsible for monitoring engine temperature for proper glow plug operation.

What are common symptoms of the P101D code?

Symptoms may include difficulty starting the engine in cold weather, reduced fuel efficiency, a check engine light, and potentially rough idling.

What causes the P101D code to be triggered?

Common causes include a faulty temperature sensor, damaged or corroded wiring, a poor connection in the circuit, or a malfunctioning glow plug control module.

Can I continue driving my 2017 GMC Sierra with the P101D code?

While the vehicle may still be drivable, itâ€™s not recommended to ignore the issue, as it can cause starting problems, especially in cold weather, and may lead to higher emissions.

How can I diagnose the P101D code on my GMC Sierra?

Use an OBDII scanner to confirm the code, then visually inspect the wiring and connectors for damage or corrosion. Test the temperature sensor and circuit with a multimeter to identify any faults.

How do I fix the P101D code?

Repairs may involve replacing the faulty temperature sensor, repairing or replacing damaged wiring, cleaning corroded connections, or replacing the glow plug control module if itâ€™s defective.

How much does it cost to repair the P101D code?

The cost can vary depending on the specific repair but typically ranges from $100 to $300, factoring in parts and labor for sensor or wiring repairs.

Can a weak battery cause the P101D code?

Yes, a weak or failing battery can contribute to voltage issues in the circuit, potentially triggering the P101D code. Ensure the battery is in good condition.

Does the P101D code affect emissions?

Yes, the P101D code can lead to improper glow plug operation, which may cause incomplete combustion and increased emissions.

Can I clear the P101D code without making repairs?

Clearing the code without addressing the root cause may temporarily turn off the check engine light but is not a permanent fix. The code will likely return if the issue isnâ€™t resolved.