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Engine-Codes – GMC – P111E 2015 GMC Sierra

P111E 2015 GMC Sierra Code - Engine Coolant Temperature Sensor Not Plausible

Quick Answer

The P111E diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that the Engine Coolant Temperature (ECT) sensor is reporting implausible data to the engine control module (ECM). Common causes include Faulty ECT sensor, Wiring or connector issues, Malfunctioning ECM. 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
P111E 2015 GMC Sierra indicates Engine Coolant Temperature Sensor Not Plausible.
Common causes
Common causes include Faulty ECT sensor, Wiring or connector issues, Malfunctioning ECM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 18, 2024
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Code P111E 2015 GMC Sierra Description

The P111E diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that the Engine Coolant Temperature (ECT) sensor is reporting implausible data to the engine control module (ECM). The ECT sensor is a crucial component that measures the temperature of the engine coolant. This information is used by the ECM to adjust fuel delivery, ignition timing, and other engine parameters to ensure optimal performance and efficiency. When the ECT sensor provides inaccurate or inconsistent readings, it can lead to a variety of issues that affect the vehicle's performance and overall operation.

OBDII Code P111E 2015 GMC Sierra - Engine Coolant Temperature Sensor Not Plausible
P111E 2015 GMC Sierra Code - Engine Coolant Temperature Sensor Not Plausible

Common Causes of P111E 2015 GMC Sierra

  1. Faulty ECT sensor
  2. Wiring or connector issues
  3. Malfunctioning ECM
  4. Cooling system problem
  5. Corrosion or contamination affecting sensor readings

Symptoms of P111E 2015 GMC Sierra

  1. Check engine light illuminated
  2. Poor fuel economy
  3. Engine overheating or running hot
  4. Rough idling or stalling
  5. Inaccurate temperature gauge readings

How to Fix P111E 2015 GMC Sierra

  1. Begin by diagnosing the issue using a scan tool to confirm the P111E code and identify the specific cause of the problem.
  2. Inspect the ECT sensor, wiring, and connectors for any visible damage or corrosion. Replace any damaged components as needed.
  3. Test the ECT sensor using a multimeter to ensure it is providing accurate readings. Replace the sensor if it is faulty.
  4. Clear the DTC and reset the ECM to see if the issue has been resolved. Monitor the vehicle for any recurring symptoms.
  5. If the problem persists, further diagnostics may be necessary to identify any underlying issues with the cooling system or ECM.

Cost to Fix P111E 2015 GMC Sierra

The typical repair costs for addressing a P111E code on a 2015 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a faulty ECT sensor can cost between $50 and $150 for the part, with additional labor costs ranging from $100 to $200. If wiring or connector issues are present, additional diagnostic time and repair costs may be required. It's important to consider the specific diagnosis time and labor rates at auto repair shops, which can vary based on location, vehicle make and model, and engine type. It's advisable to consult with a professional mechanic to get an accurate estimate for resolving this issue.

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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 P111E 2015 GMC Sierra Code

1. What does the OBDII code P111E mean on a 2015 GMC Sierra?

P111E indicates that the Engine Coolant Temperature Sensor is providing data that the vehicle's computer deems implausible or inconsistent with other engine parameters.

2. What are the common symptoms of code P111E on a 2015 GMC Sierra?

Symptoms may include a check engine light, erratic temperature gauge readings, poor engine performance, reduced fuel efficiency, or difficulty starting the engine.

3. What causes the P111E code on a GMC Sierra?

Common causes include a faulty coolant temperature sensor, wiring issues (e.g., shorts or corrosion), a failing thermostat, or a malfunctioning engine control module (ECM).

4. Can I still drive my 2015 GMC Sierra with the P111E code?

While the truck may still be drivable, ignoring the code could lead to engine overheating or reduced performance. It's best to diagnose and repair the issue promptly.

5. How do I diagnose the P111E code on a GMC Sierra?

Start by checking the coolant temperature sensor and wiring for damage. Use a multimeter to test the sensor’s resistance and compare readings to manufacturer specifications.

6. How can I fix the P111E code on my 2015 GMC Sierra?

Repairs may include replacing the coolant temperature sensor, repairing damaged wiring, flushing the cooling system, or replacing the thermostat if it’s malfunctioning.

7. How much does it cost to fix the P111E code on a GMC Sierra?

Repair costs vary depending on the issue but can range from $50 to $200 for sensor replacement or wiring repairs. Labor costs may increase the total.

8. Can a bad thermostat cause the P111E code on a GMC Sierra?

Yes, a thermostat stuck open or closed can cause temperature readings to fall outside expected ranges, triggering the P111E code.

9. Does clearing the P111E code with a scanner solve the problem?

Clearing the code may turn off the check engine light temporarily, but the underlying issue must be addressed to prevent the code from returning.

10. How often do coolant temperature sensors fail on a GMC Sierra?

Coolant temperature sensors can fail due to age, heat exposure, or contamination. While not a common failure, it can occur after several years of use. Regular maintenance helps prevent issues.

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