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Engine-Codes – GMC – P101D GMC

P101D GMC Code - Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage

Quick Answer

The P101D GMC code indicates a problem with the Glow Plug Control Module Temperature Sensor 3 Circuit, specifically detecting low voltage. Common causes include Faulty glow plug control module temperature sensor, Wiring or connection issues in the temperature sensor 3 circuit, Malfunctioning engine control module. 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 temperature sensor, Wiring or connection issues in the temperature sensor 3 circuit, Malfunctioning engine control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P101D GMC Description

The P101D GMC code indicates a problem with the Glow Plug Control Module Temperature Sensor 3 Circuit, specifically detecting low voltage. The glow plug control module is responsible for managing the glow plugs in a diesel engine, which are used to preheat the combustion chamber for easier cold starts. The temperature sensor 3 circuit is designed to monitor the temperature of the glow plug control module to ensure it operates within the proper range.

OBDII Code P101D GMC - Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage
P101D GMC Code - Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage

Common Causes of P101D GMC

  1. Faulty glow plug control module temperature sensor.
  2. Wiring or connection issues in the temperature sensor 3 circuit.
  3. Malfunctioning engine control module.
  4. Corrosion or damage to the sensor or module.
  5. Electrical system problems affecting voltage supply to the sensor.

Symptoms of P101D GMC

  1. Difficulty starting the vehicle, especially in cold weather.
  2. Reduced engine performance and power.
  3. Increased emissions and black smoke from the exhaust.
  4. Illumination of the Check Engine Light.
  5. Rough idling or engine misfires.

How to Fix P101D GMC

  1. Begin by diagnosing the specific cause of the low voltage in the temperature sensor 3 circuit using a diagnostic scanner.
  2. Inspect the wiring and connections related to the temperature sensor for any signs of damage, corrosion, or loose connections.
  3. Test the glow plug control module temperature sensor for proper functionality and voltage readings.
  4. Replace the faulty sensor or glow plug control module if necessary.
  5. Clear the diagnostic trouble codes and test the vehicle to ensure the issue has been resolved.

Cost to Fix P101D GMC

The typical repair costs for addressing a P101D GMC code can range from $150 to $400, including parts and labor. This estimate may vary depending on the specific components that need to be replaced and the labor rates at the auto repair shop. It's important to consider additional diagnosis time and potential fees for further testing or repairs that may be required. As always, it's recommended to obtain quotes from multiple repair shops to compare costs and ensure a fair price for the necessary repairs.

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Information for Specific GMC Models

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.

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