AutoCodes – GMC – P101D 2014 GMC Sierra

P101D 2014 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 2014 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 346

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 2014 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 2014 GMC Sierra - Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage - AutoCodes.com — P101D 2014 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 2014 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 2014 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 2014 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 2014 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 2014 GMC Sierra Code

1. What does the OBDII code P101D mean on a 2014 GMC Sierra?

P101D indicates that the Glow Plug Control Module (GPCM) has detected a low voltage issue in the Temperature Sensor 3 Circuit.

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

Common symptoms include difficulty starting the engine, reduced fuel efficiency, poor engine performance, and the Check Engine Light being illuminated.

3. What causes the P101D code to appear?

Potential causes include a faulty temperature sensor, damaged or corroded wiring, loose electrical connections, or a malfunctioning Glow Plug Control Module.

4. Can I drive my 2014 GMC Sierra with a P101D code?

Driving with this code is not recommended, as it can lead to rough starts and potential damage to the engine's glow plug system if left unaddressed.

5. How do I diagnose the P101D error code?

Start by inspecting the wiring and connectors for the temperature sensor, testing the sensor itself for proper functionality, and checking for proper voltage at the Glow Plug Control Module.

6. What parts may need to be replaced to fix the P101D code?

The temperature sensor, related wiring, or the Glow Plug Control Module may need replacement, depending on the root cause.

7. How much does it cost to fix the P101D code on a GMC Sierra?

Repair costs vary but typically range from $100 to $300 for parts and labor, depending on whether the sensor or module needs replacement.

8. Can a dead battery cause the P101D code?

While unlikely, a weak or dead battery can impact voltage levels in the system and potentially contribute to this issue.

9. How can I prevent the P101D code from recurring?

Regular maintenance, including inspecting the glow plug system wiring and ensuring all connections are secure, can help prevent this code.

10. Do I need a professional mechanic to clear the P101D code?

If you can diagnose and repair the issue yourself, you can clear the code with an OBDII scanner. However, consulting a professional mechanic is recommended for accurate diagnosis and repair.