AutoCodes – GMC – P101B 2016 GMC Sierra

P101B 2016 GMC Sierra 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 2016 GMC Sierra 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 267

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P101B 2016 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 P101B 2016 GMC Sierra - Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage - AutoCodes.com — P101B 2016 GMC Sierra Code - Glow Plug Control Module Temperature Sensor 2 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P101B 2016 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 P101B 2016 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 P101B 2016 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 P101B 2016 GMC Sierra code?

Need more information on how to fix the P101B 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P101B 2016 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2016 GMC Sierra Code

What does the OBDII code P101B mean on a 2016 GMC Sierra?

P101B refers to a low voltage issue in the Glow Plug Control Module Temperature Sensor 2 circuit, indicating a problem with the sensor or its wiring.

What are the common symptoms of code P101B?

Symptoms may include the check engine light turning on, difficulty starting in cold weather, reduced engine performance, or erratic idling.

What causes the P101B code to appear?

Common causes include a faulty Glow Plug Control Module Temperature Sensor 2, damaged wiring or connectors, or corrosion in the circuit.

Can a bad glow plug cause the P101B code?

No, the P101B code specifically relates to the temperature sensor circuit, not the glow plugs themselves.

How do you diagnose a P101B code?

Diagnosis involves checking for damaged wiring, testing the Glow Plug Control Module Temperature Sensor 2 with a multimeter, and inspecting for corrosion or loose connections.

Can I still drive with a P101B code?

While the vehicle may still run, driving with this code can lead to performance issues, especially in cold weather, and should be addressed promptly.

How do you fix the P101B code?

Repairs may include replacing the Glow Plug Control Module Temperature Sensor 2, repairing damaged wiring, cleaning corroded connections, or updating the engine control module (ECM) software if needed.

What is the cost to repair a P101B code?

Repair costs vary, but replacing the sensor typically costs $100-$300, depending on parts and labor rates.

Is P101B specific to diesel engines?

Yes, this code is specific to diesel engines because it pertains to the glow plug system, which is not used in gasoline engines.

Can a weak battery trigger the P101B code?

A weak battery could contribute to low voltage issues, but itâ€™s more likely to be a problem with the sensor or its circuit. Always test the battery if low voltage concerns arise.