AutoCodes – GMC – P101C 2017 GMC Sierra

P101C 2017 GMC Sierra 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 2017 GMC Sierra 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 163

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 2017 GMC Sierra 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 2017 GMC Sierra - Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage - AutoCodes.com — P101C 2017 GMC Sierra Code - Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P101C 2017 GMC Sierra?

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 2017 GMC Sierra?

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 2017 GMC Sierra 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 2017 GMC Sierra code?

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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 2017 GMC Sierra Code

What does the OBDII code P101C mean on a 2017 GMC Sierra?

Code P101C indicates an issue with the Glow Plug Control Module (GPCM) Temperature Sensor 2 Circuit, specifically detecting a high voltage condition.

What are the common symptoms of a P101C code?

Symptoms may include the check engine light turning on, poor cold-start performance, reduced engine efficiency, or the engine running rough in cold conditions.

What causes the P101C code to appear?

Common causes include a faulty temperature sensor, damaged or corroded wiring, loose electrical connections, or an issue within the Glow Plug Control Module itself.

Can I drive my 2017 GMC Sierra with a P101C code?

While the vehicle may still be drivable, ignoring the issue can lead to poor performance, especially in cold weather, and could cause further damage to the Glow Plug Control Module system.

How do you diagnose a P101C code?

Diagnosis typically involves using an OBDII scanner to confirm the code, inspecting the wiring and connections to the temperature sensor, and testing the sensor's voltage and resistance with a multimeter.

How can I fix the P101C code?

Repairs may include replacing the faulty temperature sensor, repairing or replacing damaged wiring, cleaning corroded connections, or replacing the Glow Plug Control Module if necessary.

What tools are needed to troubleshoot a P101C code?

Basic tools include an OBDII scanner, a multimeter for voltage and resistance testing, and potentially a wiring diagram for the Glow Plug Control Module system.

How much does it cost to repair a P101C code?

Costs can vary depending on the issue, but replacing a temperature sensor typically costs $50â€“$150, while more extensive repairs like replacing the Glow Plug Control Module can cost $300â€“$600.

Can a P101C code cause long-term damage?

If left unaddressed, the code could lead to decreased engine performance and additional strain on the Glow Plug Control Module, potentially resulting in higher repair costs.

Does the P101C code affect emissions?

While it primarily affects cold-start performance, prolonged issues with the glow plug system could indirectly impact emissions by causing inefficient combustion.