AutoCodes – Cadillac – P101C Cadillac

P101C Cadillac 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 Cadillac 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 390

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

What does this mean?

What are the Possible Causes of the DTC P101C Cadillac?

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 Cadillac?

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 Cadillac 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.

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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 Cadillac Code

What does the OBDII code P101C mean for my Cadillac?

The P101C code indicates that there is a high voltage issue with the Glow Plug Control Module Temperature Sensor 2 circuit.

What are the common symptoms of the P101C code?

Common symptoms include hard starting, rough idling, decreased fuel efficiency, and the illumination of the check engine light.

What could cause the P101C code to trigger?

Causes may include a faulty glow plug control module, a defective temperature sensor, damaged wiring or connectors, or issues with the engine control module (ECM).

How can I diagnose the P101C code?

You can diagnose the code by using an OBDII scanner to read the codes, visually inspecting the wiring and connectors, and testing the glow plug control module and temperature sensor with a multimeter.

What is the recommended repair for the P101C code?

Repairs may involve replacing the defective glow plug control module, sensor, or repairing any damaged wiring or connectors that are causing the high voltage issue.

Can I drive my Cadillac with the P101C code?

While it may be possible to drive the vehicle, it is not recommended as it can lead to poor engine performance, increased emissions, and potential damage to the engine if left unaddressed.

How can I prevent the P101C code from recurring?

Regular maintenance, including checking and replacing faulty components, ensuring proper electrical connections, and keeping the engine properly tuned, can help prevent the code from recurring.

Is it safe to clear the P101C code without making repairs?

Clearing the code without addressing the underlying issue is not advisable, as it may lead to ongoing performance problems and could cause further damage to the vehicle.

What tools do I need to fix the P101C code?

You will typically need an OBDII scanner, a multimeter for testing electrical components, and basic hand tools for replacing parts like the glow plug control module or temperature sensor.