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butchsmith 03-13-2008, 03:38 PM My sevice engine like keeps coming on after the truck had been runnning for about 35 minutes or so. I checked for codes and the code below keeps coming up. can some one tell me what this means and what I need to do to fix this problem Thaks all DTC 15 - Engine Coolant Temperature (ECT) Sensor Circuit High (Low Temp) chevylover 03-13-2008, 03:41 PM Perhaps bad coolant temp switch or bad/short wire. Check the temp switch with an Ohm-meter (resistance). Cu, Sven gmctd 03-13-2008, 05:09 PM DTC usually for open circuit, as in unplugged sensor, broke wires, etc butchsmith 03-14-2008, 09:56 AM DTC usually for open circuit, as in unplugged sensor, broke wires, etc Could the sensor on the coolant resivoir cause this code. while taking it apart last year I noticed the wired were cut to the sensor on the resivior. Also I had to replace all the SES light in the dash since it was taken out. I found this when we were trying to get the codes for the no start issue in another post. gmctd 03-14-2008, 01:11 PM That is the Low Coolant Sensor - ECT sensor is in the t-stat crossover manifold, near the heater hose tap, yellow and black wires - could be the sensor itself is failing, but check the wiring\connector first butchsmith 03-16-2008, 12:45 PM That is the Low Coolant Sensor - ECT sensor is in the t-stat crossover manifold, near the heater hose tap, yellow and black wires - could be the sensor itself is failing, but check the wiring\connector first ECT sensor is new but that does not mean anything, so was the OPS and I replaced it and the oil pressure gauge started working like it should. I will check the ECT wires and plug Thanks.:rolleyes: | ||