P0117 - GM Forum - Buick, Cadillac, Olds, GMC & Pontiac chat

OBD-II Trouble Shooting Got a code reader? Find out what your GM car's Check Engine light is trying to tell you (and then turn Check Engine light off).

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Old 09-24-2009, 03:28 PM   #1  
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Default P0117



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
  • 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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