P111E 2015 GMC Sierra Code - Engine Coolant Temperature Sensor Not Plausible
Quick Answer
The Engine Coolant Temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. Common causes include Faulty Engine Coolant Temperature (ECT) Sensor, Engine Coolant Temperature Sensor harness is open or shorted, Engine Coolant Temperature Sensor 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
- P111E 2015 GMC Sierra indicates Engine Coolant Temperature Sensor Not Plausible.
- Common causes
- Common causes include Faulty Engine Coolant Temperature (ECT) Sensor, Engine Coolant Temperature Sensor harness is open or shorted, Engine Coolant Temperature Sensor 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 P111E 2015 GMC Sierra Description
The purpose of this diagnostic is to determine if the input from the ECT sensor is skewed warmer or colder than the Intake Air Temperature (IAT) sensor and Radiator Coolant Temperature (RCT) sensor. The internal clock of the ECM will record the amount of time the engine is OFF. If the required engine OFF time is met at start-up, the ECM will compare temperatures between the ECT, IAT, and RCT sensors.
If the ECM detects that the temperature difference between the ECT, IAT, and RCT sensors is not within an acceptable operating range, the ECM will continue to run this diagnostic to determine if a block heater was active during the engine OFF time. The Diagnostic Trouble Code (DTC) will be set if the ECM detects that there is a temperature difference between the start-up Engine Coolant Temperature sensor, Intake Air Temperature sensor, and the Radiator Coolant Temperature (RCT) sensor.
What are the Possible Causes of the DTC P111E 2015 GMC Sierra?
- Faulty Engine Coolant Temperature (ECT) Sensor
- Engine Coolant Temperature Sensor harness is open or shorted
- Engine Coolant Temperature Sensor circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P111E 2015 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 P111E 2015 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 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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