AutoCodes – GMC – P101D 2015 GMC Sierra

P101D 2015 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 2015 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 260

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 2015 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 2015 GMC Sierra - Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage - AutoCodes.com — P101D 2015 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 2015 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 2015 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 2015 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 P101D 2015 GMC Sierra Code

1. What does the OBDII code P101D mean on a 2015 GMC Sierra?

P101D indicates a problem with the Glow Plug Control Module Temperature Sensor 3 Circuit, specifically that it is detecting a low voltage condition.

2. What are the common symptoms of code P101D on a 2015 GMC Sierra?

Symptoms may include difficulty starting the engine in cold weather, reduced engine performance, an illuminated check engine light, or increased exhaust emissions.

3. What causes code P101D to appear on a 2015 GMC Sierra?

Common causes include a faulty glow plug control module temperature sensor, damaged or corroded wiring or connectors in the circuit, or issues with the glow plug control module itself.

4. Can I drive my 2015 GMC Sierra with code P101D?

Driving with this code may be possible, but itâ€™s not recommended as it could lead to poor cold-start performance and potential long-term engine damage.

5. How do I diagnose code P101D on a 2015 GMC Sierra?

Start by inspecting the wiring and connectors for damage or corrosion. Using a multimeter, test the temperature sensor for proper resistance and check for proper voltage at the sensor circuit.

6. How can I fix code P101D on my 2015 GMC Sierra?

Repairs may include replacing the glow plug control module temperature sensor, repairing or replacing damaged wiring, or replacing the glow plug control module if necessary.

7. How much does it cost to repair code P101D on a 2015 GMC Sierra?

The cost depends on the root cause. Replacing a temperature sensor typically costs $50â€“$150 for parts, while a glow plug control module replacement may cost $300â€“$500, plus labor.

8. Can a low battery cause code P101D on a 2015 GMC Sierra?

A low or failing battery can cause voltage irregularities, which might trigger this code, so ensure the battery and charging system are in good condition.

9. Is a software update necessary to fix code P101D on a 2015 GMC Sierra?

In rare cases, a software update to the engine control module (ECM) or glow plug control module may be required. Check with a dealership to confirm if this applies to your vehicle.

10. How can I prevent code P101D from recurring on my 2015 GMC Sierra?

Regular maintenance, such as inspecting and cleaning electrical connections and ensuring the glow plug system is functioning properly, can help prevent this code from recurring.