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Engine-Codes – GMC – P101B GMC

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

Quick Answer

The P101B diagnostic trouble code for GMC vehicles refers to the Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage. Common causes include Faulty temperature sensor, Wiring issues or poor connections 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
P101B GMC indicates Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage.
Common causes
Common causes include Faulty temperature sensor, Wiring issues or poor connections 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 13, 2024
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Code P101B GMC Description

The P101B diagnostic trouble code for GMC vehicles refers to the Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage. This code indicates that there is a problem with the temperature sensor in the glow plug control module, specifically that the voltage is lower than the expected range. The glow plug control module is responsible for regulating the glow plugs in a diesel engine, which are used to heat the combustion chamber during cold starts. The temperature sensor helps the module determine when to activate the glow plugs based on the engine's temperature.

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

Common Causes of P101B GMC

  1. Faulty temperature sensor
  2. Wiring issues or poor connections in the sensor circuit
  3. Malfunctioning glow plug control module
  4. Engine computer system malfunction
  5. Corrosion or damage to sensor components

Symptoms of P101B GMC

  1. Hard starting, especially in cold weather
  2. Rough idling or misfiring
  3. Decreased fuel efficiency
  4. Increased emissions
  5. Illumination of the Check Engine Light

How to Fix P101B GMC

  1. Begin by diagnosing the specific cause of the low voltage in the temperature sensor circuit using a diagnostic scanner.
  2. Inspect the wiring and connections related to the temperature sensor for any signs of damage or corrosion. Repair or replace as necessary.
  3. Test the temperature sensor itself to determine if it is functioning correctly. Replace if faulty.
  4. Check the glow plug control module for any malfunctions or errors. Replace if needed.
  5. Clear the diagnostic trouble codes from the vehicle's computer system and test the vehicle to ensure the issue has been resolved.

Cost to Fix P101B GMC

The typical repair costs for addressing a P101B code can vary depending on the specific cause of the issue. In general, replacing a faulty temperature sensor or repairing wiring issues may cost between $100 to $300, including parts and labor. If the glow plug control module needs to be replaced, the cost can range from $200 to $500. It's important to note that these are rough estimates, and actual costs may vary based on factors such as location, vehicle make and model, and labor rates at auto repair shops. It's recommended to consult with a professional mechanic to get an accurate cost estimate for your specific situation. Labor rates at auto repair shops typically range between $80 and $150 per hour, but rates may be higher at dealerships or in metropolitan areas.

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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 P101B GMC Code

1. What are the common symptoms of OBDII code P101B GMC?

The common symptoms of OBDII code P101B GMC include rough idling, poor engine performance, decreased fuel efficiency, and in some cases, the Check Engine Light may illuminate.

2. What can cause the Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage code to trigger?

The P101B code is typically triggered by a faulty glow plug control module temperature sensor, damaged wiring or connectors, or a malfunction in the glow plug system.

3. How do I diagnose the cause of OBDII code P101B GMC?

Diagnosing the cause of P101B involves using a diagnostic scan tool to retrieve the code, inspecting the glow plug control module temperature sensor and related components, and testing the wiring for any faults.

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

It is not recommended to drive your vehicle with the P101B code present, as it can lead to further damage to the glow plug system and potentially affect the engine's performance.

5. How can I repair OBDII code P101B GMC?

To repair the P101B code, you may need to replace the faulty glow plug control module temperature sensor, repair any damaged wiring or connectors, and clear the code using a diagnostic scan tool.

6. Is it possible to prevent OBDII code P101B from occurring?

Regular maintenance of the glow plug system, including checking the temperature sensor and wiring for any issues, can help prevent the P101B code from occurring.

7. Can a DIY enthusiast fix the P101B code themselves?

Depending on your level of automotive knowledge and experience, it is possible to fix the P101B code yourself by following repair guides and using the necessary tools and equipment.

8. How much does it cost to repair OBDII code P101B GMC at a mechanic?

The cost of repairing the P101B code at a mechanic can vary depending on the extent of the issue, the cost of parts, and the labor rates of the repair shop. It is recommended to get quotes from different mechanics for comparison.

9. Will resetting the Check Engine Light resolve the P101B code?

Simply resetting the Check Engine Light without addressing the underlying issue causing the P101B code will not resolve the problem. It is important to diagnose and repair the root cause of the code.

10. Are there any recalls related to OBDII code P101B GMC?

Recalls related to OBDII code P101B GMC are specific to certain vehicle models and years. It is advisable to check with the manufacturer or a dealership to see if there are any recalls that apply to your vehicle.

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