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Engine-Codes – GMC – P101C GMC

P101C GMC Code - Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage

Quick Answer

The P101C diagnostic trouble code for GMC vehicles indicates an issue with the Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage. Common causes include Faulty temperature sensor: The sensor may be malfunctioning and sending incorrect voltage readings, Wiring issues: Damaged or corroded wiring can lead to high voltage in the circuit, Glow plug control module malfunction: A problem with the control module can cause voltage spikes. 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
P101C GMC indicates Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage.
Common causes
Common causes include Faulty temperature sensor: The sensor may be malfunctioning and sending incorrect voltage readings, Wiring issues: Damaged or corroded wiring can lead to high voltage in the circuit, Glow plug control module malfunction: A problem with the control module can cause voltage spikes.
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 08, 2024
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Code P101C GMC Description

The P101C diagnostic trouble code for GMC vehicles indicates an issue with the Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage. In diesel engines, glow plugs are used to preheat the combustion chamber for easier cold starts. The glow plug control module is responsible for monitoring and controlling the operation of the glow plugs. The temperature sensor 2 is a component that measures the temperature of the glow plug module.

OBDII Code P101C GMC - Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage
P101C GMC Code - Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage

Common Causes of P101C GMC

  1. Faulty temperature sensor: The sensor may be malfunctioning and sending incorrect voltage readings.
  2. Wiring issues: Damaged or corroded wiring can lead to high voltage in the circuit.
  3. Glow plug control module malfunction: A problem with the control module can cause voltage spikes.
  4. Electrical system issues: Problems with the vehicle's electrical system can also trigger this code.
  5. Environmental factors: Extreme temperatures or moisture can affect the sensor's performance.

Symptoms of P101C GMC

  1. Hard starting: Difficulty starting the vehicle, especially in cold weather.
  2. Rough idling: The engine may shake or vibrate while idling.
  3. Decreased fuel efficiency: The vehicle may consume more fuel than usual.
  4. Engine misfires: The engine may sputter or hesitate during acceleration.
  5. Check Engine Light: The illuminated Check Engine Light on the dashboard is a common indicator of this issue.

How to Fix P101C GMC

  1. Diagnose the issue: Use a diagnostic scanner to retrieve the trouble codes and pinpoint the exact cause of the problem.
  2. Inspect the temperature sensor: Check the sensor for any signs of damage or wear and replace if necessary.
  3. Check the wiring: Inspect the wiring harness for any damage or corrosion and repair or replace as needed.
  4. Test the glow plug control module: Verify the functionality of the control module and replace if it is faulty.
  5. Clear the codes: After completing the repairs, clear the trouble codes and test the vehicle to ensure the issue has been resolved.

Cost to Fix P101C GMC

The cost of repairing a P101C code can vary depending on the specific cause of the issue and the labor rates in your area. Typically, the cost of replacing a temperature sensor can range from $50 to $150, while repairing or replacing a control module may cost between $200 and $500. Additional costs for labor and diagnostic time should be factored in, with total repair costs potentially ranging from $200 to $800. It's recommended to get a detailed quote from a reputable auto repair shop to determine the exact cost for your specific vehicle.

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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 P101C GMC Code

1. What are the common symptoms of OBDII code P101C GMC?

- Common symptoms include check engine light illumination, rough engine idling, decreased fuel efficiency, and difficulty starting the vehicle.

2. What does the OBDII code P101C GMC indicate?

- The code indicates a high voltage condition in the Glow Plug Control Module Temperature Sensor 2 circuit.

3. What are the possible causes of OBDII code P101C GMC?

- Possible causes include a faulty glow plug control module, damaged wiring or connectors, a defective temperature sensor, or a malfunctioning powertrain control module (PCM).

4. How can I diagnose the cause of OBDII code P101C GMC?

- Diagnosing the cause may involve visually inspecting wiring and connectors, testing the glow plug control module and temperature sensor, and using a scan tool to gather data from the PCM.

5. Can I still drive my vehicle with OBDII code P101C GMC present?

- It is not recommended to drive the vehicle with this code present, as it can lead to poor engine performance and potential damage if left unresolved.

6. How do I repair OBDII code P101C GMC?

- Repairing the issue may involve replacing the glow plug control module, repairing or replacing damaged wiring, replacing the temperature sensor, or reprogramming the PCM.

7. Is it safe to reset the check engine light after resolving OBDII code P101C GMC?

- Yes, it is safe to reset the check engine light after resolving the issue. However, if the problem persists, the light may illuminate again.

8. Can extreme weather conditions affect the Glow Plug Control Module Temperature Sensor 2 circuit?

- Yes, extreme weather conditions can affect the sensor's performance, leading to potential high voltage readings and triggering OBDII code P101C GMC.

9. How important is it to address OBDII code P101C GMC promptly?

- It is important to address the code promptly to prevent further damage to the vehicle's engine and ensure optimal performance.

10. Are there any preventive maintenance tips to avoid OBDII code P101C GMC in the future?

- Regularly inspecting and maintaining the glow plug control module, temperature sensor, and related components can help prevent the recurrence of OBDII code P101C GMC.

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