AutoCodes – Buick – P101D Buick

P101D Buick Code - Glow Plug Control Module Temperature Sensor 3 Circuit Low 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: P101D Buick indicates Glow Plug Control Module Temperature Sensor 3 Circuit Low 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 518

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 P101D 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 P101D Buick - Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage - AutoCodes.com — P101D Buick Code - Glow Plug Control Module Temperature Sensor 3 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P101D 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 P101D 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 P101D 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.

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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 P101D Buick Code

1. What does the OBDII code P101D mean on a Buick?

P101D indicates an issue with the Glow Plug Control Module Temperature Sensor 3 Circuit, specifically detecting low voltage.

2. What are the common symptoms of the P101D code?

Symptoms may include difficulty starting the engine, rough idling, reduced fuel efficiency, and the check engine light turning on.

3. What causes the P101D code to appear?

Common causes include a faulty temperature sensor, damaged wiring or connectors in the circuit, or an issue with the Glow Plug Control Module itself.

4. Can I drive my Buick with the P101D code?

Itâ€™s possible, but driving with this code may lead to poor engine performance and potential damage to other components if not addressed promptly.

5. How do I fix the P101D code on my Buick?

Repairs may involve replacing the faulty temperature sensor, inspecting and repairing damaged wiring, or replacing the Glow Plug Control Module if necessary.

6. How is the P101D code diagnosed?

A technician will use a scan tool to verify the code, inspect the circuit and wiring for damage, and test the temperature sensor and module for proper functionality.

7. What tools are needed to fix the P101D code?

Common tools include a multimeter to check voltage and continuity, a scan tool for diagnostics, and basic hand tools for removing and replacing components.

8. How much does it cost to repair the P101D code?

Repair costs vary but typically range from $100 to $300, depending on whether the issue is a sensor replacement or more extensive wiring repairs.

9. Can a bad battery cause the P101D code?

Yes, a weak or failing battery can cause voltage issues that might trigger this code, so itâ€™s worth checking the battery's health.

10. How can I prevent the P101D code from recurring?

Regular maintenance, such as inspecting wiring and connectors and ensuring the Glow Plug Control Module is functioning correctly, can help prevent this code from reappearing.