Anybody out there ever use one of those safety thermostats? These are the type that will lock into the open position if overheating occurs.
I've installed three of them in our '04 GP. I get the PO126 (PO128?) code and the culprit is a thermostat that is stuck open.
I think the one I just put in (warranty replacement) is stuck open already. I was offered a regular thermostat this last time and I think I will get one the next time.