Engine Coolant Temperature Sensor harness is open or shorted
Engine Coolant Temperature Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)
How do I Fix the Code P111E Buick?
Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
What is the Cost to Diagnose the Code P111E Buick?
Labor: 1.0
The cost of diagnosing the P111E Buick code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
What are Code P111E Buick Possible Symptoms?
Engine Light ON (or Service Engine Soon Warning Light)
Code P111E Buick Description
The Engine Coolant Temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The Engine Control Module (ECM) supplies 5V to the ECT sensor signal circuit and a ground for the low reference circuit.
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. P111E Buick Code - Engine Coolant Temperature Sensor Not Plausible
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