Does anyone have an issues with the code p0128?

[Meg_2013]

This code has popped up for me it said cooling temp p0128! Now it went away for a few weeks but just came back on and I can’t see any issues the heat in the car is working and no over heating. Wondering if anyone has been dealing with that code In their Chevy sonic 1.8.

 

[Megalytle]

Just did mine yesterday. Same code and symptoms. Replaced thermostat because it was stuck open. Heat is also warmer and car heats up quicker in the cold weather. Reset code. Fixed the issue.

 

[Meg_2013]

so was your car still warming up before you replaced the thermostat?