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Engine-Codes – Generic – P101C

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

Quick Answer

The diagnostic trouble code P101C refers to the Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage. Common causes include Faulty temperature sensor, Wiring or connection issues in the temperature sensor circuit, Corrosion or damage to the temperature sensor connector. 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 indicates Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage.
Common causes
Common causes include Faulty temperature sensor, Wiring or connection issues in the temperature sensor circuit, Corrosion or damage to the temperature sensor connector.
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 12, 2024
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Code P101C Description

The diagnostic trouble code P101C refers to the Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage. This code indicates that there is a high voltage condition detected in the temperature sensor circuit of the glow plug control module. The glow plug control module is responsible for controlling the operation of the glow plugs in a diesel engine. The temperature sensor plays a crucial role in monitoring the temperature of the glow plug system. When the temperature sensor detects a high voltage condition, it can lead to various issues with the glow plug system, affecting the vehicle's performance.

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

Common Causes of P101C

  1. Faulty temperature sensor.
  2. Wiring or connection issues in the temperature sensor circuit.
  3. Corrosion or damage to the temperature sensor connector.
  4. Issues with the glow plug control module.
  5. Electrical problems in the vehicle's system.

Symptoms of P101C

  1. Difficulty starting the engine, especially in cold weather.
  2. Rough or uneven idling.
  3. Decreased fuel efficiency.
  4. Increased emissions.
  5. Check Engine Light illuminated on the dashboard.

How to Fix P101C

  1. Diagnose the issue by using a scan tool to read the trouble codes and perform voltage tests on the temperature sensor.
  2. Inspect the wiring and connections in the temperature sensor circuit for any signs of damage or corrosion.
  3. Test the temperature sensor for proper function and replace if necessary.
  4. Check the glow plug control module for any faults and replace if needed.
  5. Clear the trouble codes and test the vehicle to ensure the issue has been resolved.

Cost to Fix P101C

The cost of repairing the Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage issue can vary depending on the extent of the problem and the specific components that need to be replaced. Generally, the cost of replacing a temperature sensor can range from $50 to $150, while a glow plug control module replacement can cost between $200 and $500. Labor costs can add an additional $80 to $150 per hour. It's advisable to consult a certified mechanic or auto repair shop for a more accurate cost estimate based on your vehicle's make and model.

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Code P101C Information for Specific Makes

  • P101C Buick — Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage
  • P101C Cadillac — Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage
  • P101C Chevrolet — Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage
  • P101C GMC — Glow Plug Control Module Temperature Sensor 2 Circuit High 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 P101C Code

1. What are the common symptoms of OBDII code P101C (Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage)?

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

2. What can cause the OBDII code P101C to trigger?

- The code P101C may be triggered by a faulty glow plug control module temperature sensor, a wiring issue, or a problem with the glow plug control module itself.

3. How serious is the OBDII code P101C (Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage)?

- While the code may not cause immediate harm to the vehicle, it can lead to poor engine performance, increased emissions, and potential difficulties starting the engine in cold weather.

4. How can I diagnose the OBDII code P101C?

- Diagnosing the code typically involves using a scan tool to read the code, checking the glow plug control module temperature sensor and related wiring for any visible issues, and testing the sensor's resistance.

5. Can I continue driving with the OBDII code P101C illuminated?

- It is generally not recommended to drive with the check engine light on, as the underlying issue causing the code could worsen over time and potentially lead to more severe problems.

6. What are some repair tips for fixing the OBDII code P101C?

- Repair tips may include replacing the faulty glow plug control module temperature sensor, checking and repairing any damaged wiring, or replacing the glow plug control module if necessary.

7. How much does it typically cost to repair the OBDII code P101C?

- The cost of repairing the code can vary depending on the extent of the issue and the specific parts that need to be replaced. It is recommended to consult a mechanic for an accurate estimate.

8. Can I reset the OBDII code P101C without fixing the underlying issue?

- While you can clear the code with a scan tool, it is important to address the root cause of the problem to prevent further issues with your vehicle's performance.

9. Are there any preventive measures to avoid the OBDII code P101C in the future?

- Regular maintenance of the glow plug system, including checking and replacing faulty components, can help prevent the occurrence of the code P101C and other related issues.

10. How long does it typically take to repair the OBDII code P101C?

- The repair time can vary depending on the specific cause of the code and the complexity of the repair process. It is advisable to consult with a professional mechanic for a more accurate estimate of the repair duration.

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