Code P0128
#11
Have a lot of miles on the car? Change the thermostat and more than likely change the anti-freeze.
Get the Delco T-Stat only. This p/n may have been updated.
https://www.gmpartsdirect.com/oem-pa...bC1sNC1nYXM%3D
#12
Sitting at about 166k. Coolant was last changed at about 150k. Im assuming the thermostat is on its last legs, however pretty much everyone on here has the --- readout and no gauge. Maybe its just a matter of time before it happens here.
#14
It was just a drain/refill. I had it done same time that I had a bunch of little maintenance things done before traveling cross country. Thinking back I should've had them do the thermostat just as a preventative, but it didn't cross my mind.
#19