AutoCodes – GMC – P102E GMC

P102E GMC Code - Glow Plug Control Module Temperature Sensor 3 Not Plausible

Quick Answer

The Glow Plug Control Module has the ability to perform internal temperature diagnostics for the microprocessor and the glow plug drivers. Common causes include Faulty Glow Plug Control Module, 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: P102E GMC indicates Glow Plug Control Module Temperature Sensor 3 Not Plausible.
Common causes: Common causes include Faulty Glow Plug Control Module, 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 450

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 Jul 24, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P102E GMC Description

The Glow Plug Control Module has the ability to perform internal temperature diagnostics for the microprocessor and the glow plug drivers. If the Glow Plug Control Module temperature sensor 3 is not within 12°C (54°F) of Glow Plug Control Module temperature sensor 2 and Glow Plug Control Module Temperature Sensor 2; and the difference between Glow Plug Control Module Temperature Sensor 1 and Glow plug control module Temperature Sensor 2 is less than 12°C (54°F) for greater than 2 s, a Diagnostic Trouble Code (DTC) will be set. The Glow Plug Control Module will send a message to the Engine Control Module (ECM) to set this DTC.

OBDII Code P102E GMC - Glow Plug Control Module Temperature Sensor 3 Not Plausible - AutoCodes.com — P102E GMC Code - Glow Plug Control Module Temperature Sensor 3 Not Plausible

What does this mean?

What are the Possible Causes of the DTC P102E GMC?

Faulty Glow Plug Control Module
Glow Plug Control Module harness is open or shorted
Glow Plug Control Module circuit poor electrical connection

How to Fix the DTC P102E 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 P102E 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.

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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 P102E GMC Code

1. What does the OBDII code P102E mean on a GMC vehicle?

P102E indicates an issue with the Glow Plug Control Module Temperature Sensor 3, specifically that its signal is not plausible or within expected parameters.

2. What are the common symptoms of the P102E code?

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

3. What causes the P102E code to appear?

Common causes include a faulty temperature sensor, wiring issues such as damaged or corroded connectors, a malfunctioning glow plug control module, or software glitches in the engine control unit (ECU).

4. Can I drive my GMC with the P102E code?

While the vehicle might still be drivable, ignoring this code could lead to starting issues in cold weather and potentially cause long-term damage to the glow plug system or engine.

5. How can I diagnose the P102E code?

Start by scanning the vehicle with an OBDII tool to confirm the code. Then check the wiring and connectors for damage, test the sensor for proper operation, and inspect the glow plug control module for faults.

6. How do you fix the P102E code?

Repairs may involve replacing the faulty temperature sensor, repairing wiring or connectors, reprogramming the ECU, or replacing the glow plug control module if it's defective.

7. How much does it cost to fix the P102E code?

Repair costs vary depending on the issue. Replacing a temperature sensor typically costs $100-$300, including parts and labor, while glow plug control module repairs can be more expensive.

8. What tools are needed to troubleshoot the P102E code?

Youâ€™ll need an OBDII scanner, a multimeter to test electrical connections, and potentially a repair manual or wiring diagram for your specific GMC model.

9. Can the P102E code be caused by a software issue?

Yes, outdated or corrupted software in the engine control unit (ECU) can sometimes trigger the P102E code. A software update or reprogramming may resolve the issue.

10. Is the P102E code specific to GMC vehicles?

While the P102E code can appear on other vehicles, it is commonly associated with GMC models that use a glow plug control module with multiple temperature sensors. Always check your vehicle's manual for specifics.