AutoCodes – GMC – P101B GMC

P101B GMC Code - Glow Plug Control Module Temperature Sensor 2 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: P101B GMC indicates Glow Plug Control Module Temperature Sensor 2 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 662

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 P101B GMC 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 P101B GMC - Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage - AutoCodes.com — P101B GMC Code - Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P101B GMC?

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 P101B GMC?

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 P101B GMC 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 P101B GMC code?

Need more information on how to fix the P101B GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific GMC Models

P101B 2014 GMC Sierra — Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage
P101B 2015 GMC Sierra — Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage
P101B 2016 GMC Sierra — Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage
P101B 2017 GMC Sierra — Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage
P101B 2018 GMC Sierra — Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage

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 P101B GMC Code

1. What are the common symptoms of OBDII code P101B GMC?

The common symptoms of OBDII code P101B GMC include rough idling, poor engine performance, decreased fuel efficiency, and in some cases, the Check Engine Light may illuminate.

2. What can cause the Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage code to trigger?

The P101B code is typically triggered by a faulty glow plug control module temperature sensor, damaged wiring or connectors, or a malfunction in the glow plug system.

3. How do I diagnose the cause of OBDII code P101B GMC?

Diagnosing the cause of P101B involves using a diagnostic scan tool to retrieve the code, inspecting the glow plug control module temperature sensor and related components, and testing the wiring for any faults.

4. Can I still drive my vehicle with the P101B code present?

It is not recommended to drive your vehicle with the P101B code present, as it can lead to further damage to the glow plug system and potentially affect the engine's performance.

5. How can I repair OBDII code P101B GMC?

To repair the P101B code, you may need to replace the faulty glow plug control module temperature sensor, repair any damaged wiring or connectors, and clear the code using a diagnostic scan tool.

6. Is it possible to prevent OBDII code P101B from occurring?

Regular maintenance of the glow plug system, including checking the temperature sensor and wiring for any issues, can help prevent the P101B code from occurring.

7. Can a DIY enthusiast fix the P101B code themselves?

Depending on your level of automotive knowledge and experience, it is possible to fix the P101B code yourself by following repair guides and using the necessary tools and equipment.

8. How much does it cost to repair OBDII code P101B GMC at a mechanic?

The cost of repairing the P101B code at a mechanic can vary depending on the extent of the issue, the cost of parts, and the labor rates of the repair shop. It is recommended to get quotes from different mechanics for comparison.

9. Will resetting the Check Engine Light resolve the P101B code?

Simply resetting the Check Engine Light without addressing the underlying issue causing the P101B code will not resolve the problem. It is important to diagnose and repair the root cause of the code.

10. Are there any recalls related to OBDII code P101B GMC?

Recalls related to OBDII code P101B GMC are specific to certain vehicle models and years. It is advisable to check with the manufacturer or a dealership to see if there are any recalls that apply to your vehicle.