P101D 2018 GMC Sierra 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 2018 GMC Sierra 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.
Code P101D 2018 GMC Sierra Description
What are the Possible Causes of the DTC P101D 2018 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 P101D 2018 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 P101D 2018 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.
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Frequently Asked Questions about P101D 2018 GMC Sierra Code
1. What does the OBDII code P101D mean on a 2018 GMC Sierra?
P101D indicates a low voltage issue in the Glow Plug Control Module Temperature Sensor 3 Circuit, which helps monitor and manage the glow plug system's performance.
2. What are the common symptoms of code P101D in a 2018 GMC Sierra?
Symptoms may include difficulty starting the engine in cold weather, reduced engine performance, a check engine light, or rough idling.
3. What causes the P101D code to appear?
Common causes include a faulty temperature sensor, damaged wiring or connectors in the sensor circuit, corrosion, or a malfunctioning glow plug control module.
4. Can I drive my 2018 GMC Sierra with a P101D code?
Driving with a P101D code is possible but not recommended, as it may lead to poor engine performance, especially in cold conditions, and can cause further damage if left unresolved.
5. How do I fix the P101D code on my 2018 GMC Sierra?
Repair steps include inspecting and repairing damaged wiring or connectors, replacing the temperature sensor if faulty, or replacing the glow plug control module if necessary.
6. How much does it cost to fix a P101D code?
Repair costs vary depending on the issue; replacing a sensor may cost $50–$200, while a glow plug control module replacement can cost $300–$600, plus labor.
7. Can a P101D code be caused by a dead battery?
A weak or dead battery can cause low voltage issues, potentially triggering the P101D code, so it's worth checking the battery's health.
8. How do I diagnose a P101D code on my 2018 GMC Sierra?
Diagnosis involves using an OBDII scanner to confirm the code, visually inspecting wiring and connectors, and testing the temperature sensor and control module with a multimeter.
9. Will clearing the P101D code fix the problem?
Clearing the code may temporarily turn off the check engine light, but the underlying issue must be resolved to prevent the code from reappearing.
10. What tools are needed to troubleshoot a P101D code?
You’ll need an OBDII scanner, a multimeter for testing voltage and continuity, and possibly basic tools to inspect and replace components.
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