I already replaced the sensor with a brand new one, I checked the voltage from the car and its 5V, and I checked the fluid level and its fine, and its not overheating

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Originally Posted by seagates5

I already replaced the sensor with a brand new one, I checked the voltage from the car and its 5V, and I checked the fluid level and its fine, and its not overheating

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Did you use the ECM for your ground?
There could be an internal fault that prevents the ECM from "seeing" the sensor properly: the ECM is sending the correct reference voltage but does not recognize the signal when it comes back.

Not yet but I think its OK because I checked the temp with my scan tool and the read ing was normal. So I disconnected the sensor and the temp dropped to -40°c. So I think its reading it. I turned off the light and drive 100 miles before it popped back on, when before it would come on almost right away