AutoCodes – Chevrolet – P101C 2018 Chevrolet Silverado

P101C 2018 Chevrolet Silverado Code - Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage

Quick Answer

The Glow Plug Control Module (GPCM) has the ability to perform internal diagnostics for the temperature sensor circuit. Common causes include Faulty Glow Plug Control Module (GPCM), Glow Plug Control Module harness is open or shorted, Glow Plug Control Module circuit poor electrical connection. 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 2018 Chevrolet Silverado indicates Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage.
Common causes: Common causes include Faulty Glow Plug Control Module (GPCM), Glow Plug Control Module harness is open or shorted, Glow Plug Control Module circuit poor electrical connection.
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.

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Code Popularity 233

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Oct 01, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P101C 2018 Chevrolet Silverado Description

The Glow Plug Control Module (GPCM) has the ability to perform internal diagnostics for the temperature sensor circuit. The GPCM monitors the internal temperature sensor voltage and if the voltage is less than 0.21 V or greater than 4.94 V. The GPCM will send a message to the Engine Control Module (ECM) to set the appropriate Diagnostic Trouble Code (DTC). A DTC is detected when one of the GPCM temperature sensors voltage falls outside the calibrated threshold for greater than 1.3 s.

OBDII Code P101C 2018 Chevrolet Silverado - Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage - AutoCodes.com — P101C 2018 Chevrolet Silverado Code - Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P101C 2018 Chevrolet Silverado?

Faulty Glow Plug Control Module (GPCM)
Glow Plug Control Module harness is open or shorted
Glow Plug Control Module circuit poor electrical connection

How to Fix the DTC P101C 2018 Chevrolet Silverado?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P101C 2018 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P101C 2018 Chevrolet Silverado code?

Need more information on how to fix the P101C 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 P101C 2018 Chevrolet Silverado Code

What does the OBDII code P101C mean on a 2018 Chevrolet Silverado?

Code P101C indicates that the Glow Plug Control Module (GPCM) has detected a high voltage issue in the Temperature Sensor 2 circuit.

What are the common symptoms of P101C in a 2018 Chevrolet Silverado?

Common symptoms include a check engine light, difficulty starting in colder temperatures, reduced fuel efficiency, and potential limp mode activation.

What causes the P101C code to appear?

This code is typically caused by a faulty temperature sensor, damaged wiring or connectors in the sensor circuit, or an issue with the Glow Plug Control Module itself.

Can I drive my 2018 Chevrolet Silverado with the P101C code?

While the truck may still be drivable, itâ€™s not recommended as the issue can affect engine performance, especially in cold weather conditions.

How do I diagnose the P101C code?

Start by inspecting the wiring and connectors around the Temperature Sensor 2 for damage or corrosion. Use a multimeter to test the sensor's voltage and resistance. If no issues are found, the Glow Plug Control Module may need further testing.

How do I fix the P101C code on my Silverado?

Repairs may include replacing the Temperature Sensor 2, repairing or replacing damaged wiring or connectors, or replacing the Glow Plug Control Module if itâ€™s determined to be faulty.

How much does it cost to repair the P101C code?

The cost can vary depending on the issue, but replacing a temperature sensor generally costs $100-$300, including parts and labor. Wiring repairs or module replacement may cost more.

Can a bad glow plug cause the P101C code?

A bad glow plug itself is not likely to cause this code, but issues with the Glow Plug Control Module or its related circuits can trigger it.

Is the P101C code specific to the Chevrolet Silverado?

No, this code can appear in other vehicles with diesel engines that use similar Glow Plug Control Modules, but the diagnostic and repair steps may vary.

Do I need special tools to fix the P101C code?

Basic tools like a multimeter and an OBDII scanner are typically sufficient for diagnosing and repairing this code. In some cases, advanced diagnostic tools may be needed.