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Engine-Codes – Generic – P101B

P101B Code - Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage

Quick Answer

The diagnostic trouble code P101B refers to the Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage. Common causes include Faulty glow plug control module temperature sensor, Wiring or connection issues in the temperature sensor circuit, Corrosion or damage to the sensor or its wiring. 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
P101B indicates Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage.
Common causes
Common causes include Faulty glow plug control module temperature sensor, Wiring or connection issues in the temperature sensor circuit, Corrosion or damage to the sensor or its wiring.
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 09, 2024
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Code P101B Description

The diagnostic trouble code P101B refers to the Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage. This code indicates that the temperature sensor in the glow plug control module is reporting a lower voltage than expected. The glow plug control module is an essential component in diesel engines, as it helps to regulate the glow plugs' operation, which are crucial for cold starting. The temperature sensor in the module is responsible for monitoring the temperature of the module itself to ensure it is operating within the correct parameters.

OBDII Code P101B - Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage
P101B Code - Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage

Common Causes of P101B

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

Symptoms of P101B

  1. Difficulty starting the vehicle, especially in cold weather.
  2. Extended cranking times before the engine starts.
  3. Decreased fuel efficiency.
  4. Increased emissions.
  5. Engine misfires or rough idling.

How to Fix P101B

  1. Begin by diagnosing the specific cause of the low voltage reading in the glow plug control module temperature sensor circuit using a diagnostic scanner.
  2. Inspect the wiring and connections in the sensor circuit for any damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test the glow plug control module temperature sensor for proper function. Replace the sensor if it is found to be faulty.
  4. If the issue persists, inspect the glow plug control module for any faults or malfunctions. Replace the module if needed.
  5. Clear the diagnostic trouble codes from the vehicle's computer and test the vehicle to ensure the issue has been resolved.

Cost to Fix P101B

The cost of repairing a Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage issue can vary depending on the specific cause of the problem and the vehicle's make and model. Generally, the replacement sensor can cost between $50 and $150, while the glow plug control module itself can range from $100 to $300. Labor costs can add an additional $100 to $300, depending on the shop's hourly rates and the complexity of the repair. Overall, the total repair cost for this issue could range from $200 to $600, including parts and labor. It's recommended to obtain quotes from local auto repair shops for a more accurate estimate.

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Code P101B Information for Specific Makes

  • P101B Buick — Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage
  • P101B Cadillac — Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage
  • P101B Chevrolet — Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage
  • P101B GMC — Glow Plug Control Module Temperature Sensor 2 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 P101B Code

1. What are the common symptoms of OBDII code P101B (Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage)?

The common symptoms of code P101B may include hard starting, rough idling, reduced engine performance, and the illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P101B?

The possible causes of code P101B can include a faulty glow plug control module, a defective temperature sensor, damaged wiring or connectors, or an issue with the vehicle's electrical system.

3. How can I diagnose OBDII code P101B?

Diagnosing code P101B typically involves using a diagnostic scanner to retrieve the code, checking the glow plug control module and temperature sensor for faults, inspecting wiring and connectors for damage, and testing the electrical system for proper voltage and continuity.

4. Can I still drive my vehicle with OBDII code P101B present?

It is not recommended to drive your vehicle with code P101B present, as it can lead to poor engine performance and potential damage if left unresolved. It is best to address the issue promptly.

5. How can I repair OBDII code P101B?

Repairing code P101B may involve replacing the glow plug control module, replacing the temperature sensor, repairing damaged wiring or connectors, or addressing any underlying electrical issues causing the low voltage condition.

6. Will clearing the OBDII code P101B turn off the Check Engine Light?

Clearing the code may temporarily turn off the Check Engine Light, but if the underlying issue causing code P101B is not addressed, the light is likely to come back on once the problem is detected again by the vehicle's onboard diagnostics.

7. Is it safe to continue driving if the Check Engine Light is flashing due to OBDII code P101B?

If the Check Engine Light is flashing, it indicates a severe issue that requires immediate attention. It is not safe to continue driving in this condition, as it can lead to further damage to the vehicle. Pull over and have the vehicle towed to a repair facility.

8. Can a DIY enthusiast repair OBDII code P101B at home?

While some aspects of diagnosing and repairing code P101B may be within reach of a DIY enthusiast, dealing with electrical components and sensors may require specialized tools and knowledge. It is recommended to consult a professional mechanic for proper diagnosis and repair.

9. How much does it typically cost to repair OBDII code P101B?

The cost of repairing code P101B can vary depending on the underlying cause, the parts needed for repair, and labor costs. It is advisable to get a diagnosis from a mechanic to determine the exact cost of repairs for your specific situation.

10. Can OBDII code P101B cause damage to other engine components if not addressed promptly?

If left unresolved, code P101B can lead to decreased engine performance, increased fuel consumption, and potentially cause damage to other engine components over time. It is important to address the issue promptly to prevent further damage.

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