DTC P1115 - ECT SENSOR CIRCUIT INTERMITTENT HIGH VOLTAGE GMC Envoy I

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

Circuit Description

Engine Coolant Temperature (ECT) sensor is a thermistor or a variable resistor, 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 VCM sees an ECT sensor voltage of greater than 5 volts.

Condition for setting DTC

1. Engine run time greater than 5 seconds.
2. ECT greater than 4.9 volts.