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P101B 2015 GMC Sierra Code - Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage

Quick Answer

The P101B diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Glow Plug Control Module Temperature Sensor 2 Circuit registering low voltage. Common causes include Malfunctioning glow plug control module temperature sensor, Damaged or corroded wiring connecting the sensor to the control module, Faulty 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 2015 GMC Sierra indicates Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage.
Common causes
Common causes include Malfunctioning glow plug control module temperature sensor, Damaged or corroded wiring connecting the sensor to the control module, Faulty 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 16, 2024
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Code P101B 2015 GMC Sierra Description

The P101B diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Glow Plug Control Module Temperature Sensor 2 Circuit registering low voltage. The glow plug control module is a crucial component in diesel engines, responsible for managing the glow plugs that aid in starting the engine, especially in cold conditions. The temperature sensor 2 circuit is designed to monitor the temperature of the glow plug control module to ensure proper functioning. When the sensor detects low voltage, it indicates a potential issue with the module's temperature regulation, which can impact the performance of the glow plugs and, consequently, the engine's starting process.

OBDII Code P101B 2015 GMC Sierra - Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage
P101B 2015 GMC Sierra Code - Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage

Common Causes of P101B 2015 GMC Sierra

  1. Malfunctioning glow plug control module temperature sensor.
  2. Damaged or corroded wiring connecting the sensor to the control module.
  3. Faulty glow plug control module.
  4. Electrical issues, such as a blown fuse or relay affecting the sensor circuit.
  5. Environmental factors, such as extreme temperatures impacting sensor performance.

Symptoms of P101B 2015 GMC Sierra

  1. Check engine light illuminated on the dashboard.
  2. Difficulty starting the engine, especially in cold weather.
  3. Extended cranking times before the engine starts.
  4. Reduced engine power and efficiency.
  5. Rough idling or misfiring.

How to Fix P101B 2015 GMC Sierra

  1. Begin by diagnosing the specific cause of the low voltage in the temperature sensor circuit using a diagnostic scanner.
  2. Inspect the wiring harness and connectors for any damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test the glow plug control module temperature sensor for proper functionality. Replace if found to be faulty.
  4. Check the glow plug control module for any defects or malfunctions. Replace if needed.
  5. Clear the DTC and reset the check engine light to verify that the issue has been successfully resolved.

Cost to Fix P101B 2015 GMC Sierra

The typical repair costs for addressing a P101B code on a 2015 GMC Sierra can vary depending on the specific cause of the issue. In general, parts such as a new temperature sensor or glow plug control module may range from $100 to $300, while labor costs could amount to $100 to $300, depending on the shop's hourly rates. Overall, the total repair cost for this issue may fall within the range of $200 to $600. It's important to note that these estimates are approximate, and actual costs may differ based on factors such as location, vehicle make and model, and the extent of the repairs needed. It's advisable to consult with a qualified mechanic or auto repair shop for a more accurate cost assessment.

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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 P101B 2015 GMC Sierra Code

1. What does the OBDII code P101B mean on a 2015 GMC Sierra?

P101B indicates a "Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage," meaning the sensor is reporting a voltage below the expected range.

2. What are the common symptoms of the P101B code on a 2015 GMC Sierra?

Symptoms may include difficulty starting in cold weather, reduced engine performance, a check engine light, and possibly a rough idle.

3. What causes the P101B code to appear?

Common causes include a faulty temperature sensor, damaged wiring or connectors, short circuits, or issues with the glow plug control module.

4. Can I drive my 2015 GMC Sierra with the P101B code active?

While the truck may still be drivable, it might experience starting issues in cold weather and reduced performance. Prompt diagnosis and repair are recommended.

5. How do I diagnose the P101B code on a 2015 GMC Sierra?

Start by inspecting the temperature sensor wiring and connectors for damage or corrosion, then test the sensor itself and the glow plug control module for proper operation.

6. How do I fix the P101B code on my GMC Sierra?

Repairs may involve replacing the temperature sensor, repairing damaged wiring or connectors, or replacing the glow plug control module if it’s faulty.

7. Is the temperature sensor the only possible issue causing P101B?

No, while the sensor is a common cause, wiring issues, connector problems, or a failing glow plug control module can also trigger the code.

8. How much does it cost to repair the P101B code on a 2015 GMC Sierra?

The repair cost depends on the issue but typically ranges from $100 to $300 for parts and labor, depending on whether the sensor or module needs replacement.

9. Can a bad battery cause the P101B code?

A weak or failing battery could contribute to electrical issues, but it’s not a direct cause of P101B. Always ensure the battery is in good condition when diagnosing electrical faults.

10. Do I need specialized tools to fix the P101B code?

Basic tools like a multimeter for testing voltage and an OBDII scanner to clear the code are helpful. Advanced diagnostics may require more specialized tools.

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