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That is a weak thermostat. I have had the same issue. AC doesnt work either. Changed out thermostat and its working fine. Best place to buy a thermostat is Rock Auto
Last edited by CorvetteMike2024; Oct 8, 2022 at 08:41 PM.
The temp. gauge doesn't register, it stays on zero and the coolant fan stays on and will not cut off unless you disconnect the battery.
It's probably the thermostat, as others have said.
If you had removed the existing sensor and then put it back (the same sensor), odds are the car would run correctly, just like REPLACING the sensor.
The steps used to remove/replace the sensor reset the system and it works until the THERMOSTAT doesn't open as fast as the computer expects on cold start, and the computer then sets the undertemp code causing your symptoms. It's probably not the sensor.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
My 2016 did the same thing about 14 months ago.
We were on a trip and suddenly lost the temp gauge.
Went to Chevy and bought the sensor.
On the trip home discovered that the temp gauge never got to 190.
Bought a new T-stat from GM. You get the whole assembly, not just the thermostat it self.
Easy R&R.
Been fine ever since.