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

Quick Answer

The P101D diagnostic trouble code (DTC) specifically pertains to the Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage in a 2014 GMC Sierra. Common causes include Faulty temperature sensor, Wiring issues or a short circuit in the sensor circuit, Malfunctioning glow plug 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 2014 GMC Sierra indicates Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage.
Common causes
Common causes include Faulty temperature sensor, Wiring issues or a short circuit in the sensor circuit, Malfunctioning glow plug 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 11, 2024
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Code P101D 2014 GMC Sierra Description

The P101D diagnostic trouble code (DTC) specifically pertains to the Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage in a 2014 GMC Sierra. This code indicates that there is a problem with the temperature sensor circuit associated with the glow plug control module. The glow plug control module is an essential component in diesel engines, as it helps to heat the glow plugs to ensure a smooth start, especially in cold weather conditions. The temperature sensor is responsible for monitoring the temperature of the glow plug control module to ensure it operates within the optimal range.

OBDII Code P101D 2014 GMC Sierra - Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage
P101D 2014 GMC Sierra Code - Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage

Common Causes of P101D 2014 GMC Sierra

  1. Faulty temperature sensor.
  2. Wiring issues or a short circuit in the sensor circuit.
  3. Malfunctioning glow plug control module.
  4. Corrosion or poor connections in the sensor circuit.
  5. Electrical issues within the vehicle's system.

Symptoms of P101D 2014 GMC Sierra

  1. Difficulty starting the vehicle, especially in cold weather.
  2. Rough idling or misfires when the engine is running.
  3. Decreased fuel efficiency.
  4. Illumination of the check engine light on the dashboard.
  5. Increased emissions output.

How to Fix P101D 2014 GMC Sierra

  1. Begin by diagnosing the issue using a diagnostic scanner to confirm the P101D DTC.
  2. Inspect the temperature sensor and its wiring for any visible damage or corrosion. Replace the sensor if necessary.
  3. Check the glow plug control module for any faults or malfunctions. Replace the module if needed.
  4. Clear the DTC from the vehicle's computer and test the system to ensure the issue has been resolved.
  5. Perform a test drive to verify that the vehicle starts smoothly and operates without any issues.

Cost to Fix P101D 2014 GMC Sierra

The typical repair costs for addressing the Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage code can range from $200 to $500, depending on the extent of the damage and the parts required. This estimate includes the cost of a new temperature sensor, potential labor charges, and diagnostic fees. It is essential to note that labor rates at auto repair shops can vary, and additional costs may apply if other components need to be replaced or repaired. It is advisable to consult with a professional mechanic for a more accurate estimate based on the specific circumstances of the vehicle.

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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.

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