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-   OBD-II Trouble Shooting (https://www.gmforum.com/obd-ii-trouble-shooting-153/)
-   -   P0117 (https://www.gmforum.com/obd-ii-trouble-shooting-153/p0117-284071/)

Danthurs 09-24-2009 04:28 PM

P0117
 
P0117

Description
ECT SENSOR CIRCUIT LOW VOLTAGE

Engine Coolant Temperature (ECT) sensor is a thermistor that
varies resistance based on temperature. As temperature of sensor
increases, resistance decreases. Low temperature will result in a high
signal voltage. DTC will set when PCM sees an excessively high ECT
sensor voltage signal.

Potential Symptoms
  • Very poor fuel economy
  • Engine wont start
  • Engine may start, but run very poorly, blowing black smoke, running very rough and misfiring
  • SES light
Causes
  • Corroded connection at the sensor
  • Brake in the ground wire between sensor and PCM
  • A short in the wire between the sensor and the PCM
  • Defective ECT sensor
Possible Solutions


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