Having same issue with steering assist reduced & no temp indication.
Already replaced temp sending unit.
Some confuse temp. sending unit with thermostat. They are in same area location. I bought a thermostat & tube, but was able to just replace the sending unit without pulling the thermostat tube out of the way so they are still in the box.
I don't suspect the thermostat because the engine is cooling, although an air pocket around the sending unit from coolant not circulating is plausible. This would give a low reading, but not no reading at all?
I have checked the sending unit wiring all the way to the computer & reseated plugs.
When I disconnect the battery for 15 minutes, all is well again. The battery connections are all good & battery is only a couple years old (this means nothing nowadays).
I'd like to hear feedback from people who have corrected this issue, but a year or so down the road. Not within a week of replacing or correcting something when it could pop back up a month down the road. Not a lot of info on this.
These vehicles are prone to computer glitch's and need reset way to often, (not as often as my CTS) could this be the case with this issue???