AutoCodes – GMC – P101D GMC

P101D GMC 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 GMC 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 408

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 Oct 01, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P101D GMC 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 GMC - Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage - AutoCodes.com — P101D GMC Code - Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P101D GMC?

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 GMC?

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 GMC 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 GMC code?

Need more information on how to fix the P101D GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific GMC Models

P101D 2014 GMC Sierra — Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage
P101D 2015 GMC Sierra — Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage
P101D 2016 GMC Sierra — Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage
P101D 2017 GMC Sierra — Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage
P101D 2018 GMC Sierra — Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage

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 GMC Code

1. What are the common symptoms of OBDII code P101D in a GMC vehicle?

- Common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and difficulty starting the engine.

2. What does the OBDII code P101D GMC indicate?

- The code P101D indicates a low voltage condition in the Glow Plug Control Module Temperature Sensor 3 Circuit.

3. What are the possible causes of OBDII code P101D in a GMC vehicle?

- The code P101D can be triggered by issues such as a faulty glow plug control module, damaged wiring or connectors, or a malfunctioning temperature sensor.

4. How can I diagnose the cause of OBDII code P101D in my GMC vehicle?

- A thorough inspection of the glow plug control module, temperature sensor, and related wiring is recommended. Using a multimeter to test for voltage and continuity can help pinpoint the issue.

5. Can I still drive my GMC vehicle with the OBDII code P101D present?

- It is not recommended to drive your vehicle with the code P101D present, as it can lead to further damage to the engine and emissions system.

6. How can I repair OBDII code P101D in my GMC vehicle?

- Repairing the code P101D typically involves replacing the faulty glow plug control module, repairing damaged wiring or connectors, or replacing the malfunctioning temperature sensor.

7. Is it safe to reset the OBDII code P101D without addressing the underlying issue?

- Resetting the code without fixing the underlying issue may temporarily turn off the check engine light, but the problem will likely recur, affecting engine performance and emissions.

8. Can extreme weather conditions affect the triggering of OBDII code P101D in a GMC vehicle?

- Yes, extreme cold temperatures can put additional strain on the glow plug control module and temperature sensor, potentially leading to the code P101D being triggered.

9. How long does it typically take to repair OBDII code P101D in a GMC vehicle?

- The repair time for the code P101D can vary depending on the exact cause of the issue, but it generally takes a few hours to diagnose and fix the problem.

10. Are there any preventive maintenance tips to avoid OBDII code P101D in a GMC vehicle?

- Regularly inspecting and maintaining the glow plug control module, temperature sensor, and related components can help prevent the occurrence of the code P101D.