AutoCodes – Buick – P101C Buick

P101C Buick 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 Buick 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 374

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

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

What does this mean?

What are the Possible Causes of the DTC P101C Buick?

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 Buick?

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 Buick 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 Buick code?

Need more information on how to fix the P101C Buick 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 Buick Code

1. What does the OBDII code P101C mean for a Buick?

P101C indicates a high voltage issue in the circuit for the Glow Plug Control Module Temperature Sensor 2.

2. What are common symptoms of the P101C code in a Buick?

Symptoms may include difficulty starting, poor engine performance, reduced fuel efficiency, and an illuminated check engine light.

3. What causes the P101C code to be triggered?

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

4. Can I drive my Buick with the P101C code present?

Driving with this code is not recommended, as it may lead to poor engine performance and potential damage to the glow plug system.

5. How do mechanics diagnose the P101C code?

Mechanics typically use an OBDII scanner to confirm the code, inspect the sensor and wiring for damage, and test the voltage and resistance of the circuit.

6. How can I fix the P101C code on my Buick?

Repairs may involve replacing the temperature sensor, repairing or replacing damaged wiring, or replacing the glow plug control module if itâ€™s faulty.

7. How much does it cost to fix the P101C code?

Repair costs can vary but typically range between $100 and $300, depending on whether parts like the sensor or control module need replacing.

8. Can a dirty or corroded connector cause the P101C code?

Yes, corroded or dirty connectors can disrupt the electrical circuit, leading to high voltage readings and triggering the code.

9. How do I prevent the P101C code from recurring?

Regular maintenance, including inspecting and cleaning connectors, ensuring wiring is intact, and addressing any electrical issues promptly, can help prevent this code.

10. Is the P101C code specific to Buick vehicles?

The P101C code is not exclusive to Buick, but its exact meaning and repair approach may vary depending on the vehicle manufacturer. Always refer to your vehicleâ€™s service manual.