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DTC P0117 - ECT SENSOR CIRCUIT LOW VOLTAGE GMC Envoy I

Note. For circuit reference, see WIRING DIAGRAMS - 4.3L article.

Circuit Description

Engine Coolant Temperature (ECT) sensor is a thermistor that varies resistance based on temperature. As temperature of sensor increases, resistance decreases. High temperature will result in a low signal voltage. DTC will set when VCM sees an ECT sensor voltage of less than 0.82 volt for 10 seconds after engine runs for 100 seconds.

Conditions for setting DTC

  1. Engine run time is greater than 5 seconds.