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Recently the temperature gauge in my 2012 Cruze quit working and stayed completely at cold even after driving for long periods of time. My dashboard said ac off due to high engine temp and my check engine light came on. I took it to advanced auto where they said the po128 code came up and it was my thermometer i just had my thermometer replaced in May. After research i saw it might be the coolant temp sensor so i bought that first and replaced with no luck so i went and bought another thermometer thinking the one they replaced it with was junk and that also didn’t work. Coolant is full and the line was bled. My engine fan runs the whole time I’m driving everyone says it’s fine to drive but it’s more of a nuisance even if it is fine i prefer to not pay an arm and leg to get it fixed. Thank you
 

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There's 2 sensors. Try replacing the other one.

There's tons of threads on this forum regarding your very same issues. I don't think any of them came with thermometers though. I think they all came with thermostats. :)
PHP:
What you have is a common problem.
 

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Recently the temperature gauge in my 2012 Cruze quit working and stayed completely at cold even after driving for long periods of time. My dashboard said ac off due to high engine temp and my check engine light came on. I took it to advanced auto where they said the po128 code came up and it was my thermometer i just had my thermometer replaced in May. After research i saw it might be the coolant temp sensor so i bought that first and replaced with no luck so i went and bought another thermometer thinking the one they replaced it with was junk and that also didn’t work. Coolant is full and the line was bled. My engine fan runs the whole time I’m driving everyone says it’s fine to drive but it’s more of a nuisance even if it is fine i prefer to not pay an arm and leg to get it fixed. Thank you

I had that same thing. Had to replace the thermostat and water pump - if I remember correctly it comes in one piece, so you'd have to replace both. It was a couple years ago, so I might be saying it wrong - one of the more mechanically inclined can correct me.
 

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Ok just so-as not to start a new thread on this....

I have the same code. I replaced the thermostat in the spring as it was cracked. After getting the code I replaced both the other temp sensors and the code remains. Disconnecting the battery clears the code for a little bit and then while watching the temp it never gets above 160deg F. It used to run 217-220 depending on weather/use of AC. I drove from VT>ME>CT yesterday and at one stop in the beginning I popped the hood and checked the hoses. Drivers side hose seemed normal, passenger side (connected to the thermostat) was cool. Not cold but not hot at all. I’m guessing the thermostat failed already? Is there a range or value that’s I can test with my volt/ohms meter on the thermostat? When I did the thermostat, and the sensors I refilled the radiator reservoir and waited for it to burp on warmup. The reservoir has never been dry.

The only thing I’ve done recently was the V2 PCV kit and replaced the corrugated PCV tube, cleaned the entire turbo route and pressure tested it.
 
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