P1117 - Engine Coolant Temperature Sensor Intermittent

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?

P1117 Possible Causes

  • Low Engine Coolant Level
  • Faulty Engine Coolant Temperature (ECT) sensor
  • Engine Coolant Temperature (ECT) sensor harness is open or shorted
  • Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
  • Faulty Engine Coolant Thermostat
  • Damaged Powertrain Control Module (PCM)

First diagnose P1117 code

    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 terminals.

Cost of diagnosing the P1117 code

    Labor: 1.0

    The cost of diagnosing the P1117 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

P1117 Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine Overheating

P1117 Meaning

The Engine Coolant Temperature (ECT) Sensor is a thermistor device in which resistance changes with temperature. The electrical resistance of a thermistor decreases as the temperature increases, and the resistance increases as the temperature decreases. The varying resistance changes the voltage drop across the sensor terminals and provides electrical signals to the Powertrain Control Module (PCM) corresponding to temperature.
Thermistor-type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network so varying the resistance of the passive sensor causes a variation in total current flow. Voltage that is dropped across a fixed resistor (pull-up resister) in series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The ECT measures the temperature of the engine coolant. The PCM uses the ECT input for fuel control and for cooling fan control. There are 3 types of ECT sensors; threaded, push-in, and twist-lock. The ECT sensor is located in an engine coolant passage.
OBDII Code P1117 - Engine Coolant Temperature Sensor Intermittent - Engine-Codes.com

P1117 More Information

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P1117 Information for specific makes

  • P1117 AUDI HO2S Sensor Heater Circuit Short To Ground Bank 1 Sensor 2
  • P1117 BMW Mass Or Volume Air Flow Circuit Low Input Bank 2
  • P1117 BUICK Engine Coolant Temperature Signal Out-Of-Range Low
  • P1117 CADILLAC Engine Coolant Temperature Signal Out-Of-Range Low
  • P1117 CHEVROLET Engine Coolant Temperature Signal Out-Of-Range Low
  • P1117 FORD Engine Coolant Temperature Sensor Intermittent
  • P1117 GMC Engine Coolant Temperature Signal Out-Of-Range Low
  • P1117 KIA HO2S Circuit Low Voltage Bank 1 Sensor 2
  • P1117 LAND-ROVER Thermostat Monitoring Sensor Short Circuit To Ground
  • P1117 LEXUS Coolant Temperature Sensor Circuit Stack for Coolant Heat Storage System
  • P1117 LINCOLN Engine Coolant Temperature Sensor Intermittent
  • P1117 MAZDA Engine Coolant Temperature Sensor Intermittent
  • P1117 MERCURY Engine Coolant Temperature Sensor Intermittent
  • P1117 MINI Mass Or Volume Air Flow Circuit Low Input Bank 2
  • P1117 SCION Coolant Temperature Sensor Circuit Stack for Coolant Heat Storage System
  • P1117 TOYOTA Coolant Temperature Sensor Circuit Stack for Coolant Heat Storage System
  • P1117 VOLKSWAGEN HO2S Sensor Heater Circuit Short To Ground Bank 1 Sensor 2

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