I did take the smaller hose off but left the other one on. That way I could pull the housing up, and out of the way. The smaller hose came off really easy. If it had been stuck on there, I probably would have left it on.
My 2008 has done this intermittently for a year or so, mostly in colder weather just as written here by others. Local dealer (live in Denver) replaced sending unit a few months ago, did not fix. Happened again yesterday and took it in this morning and they are getting TS code and replacing it today. My question is if computer is kicking this up because engine is not in expected heat range, how does it happen on cold startup? And how does it happen after I've parked and it's sat for an hour. It's up immediately upon startup. Oil temp stays fine, fans are running, I'm not seeing overheat issues, just curious how the code is there on cold startup. Reading through forum posts that's what I don't understand.
Hopefully replacing TS is the cure, problem is a nuisance and had me in a panic first time it happened.
I'm about to dive into this one - notice came on while I was driving to band practice. Came up again and then reset itself, I guess. I'll pick up the 160* t-stat this week and knock it out.
After months of dealing with this and keeping a scan tool with me I replaced to 160 mr gasket t-stat. Been off ever since thanks cadillac forums your the sh**. I replaced with the stock t-stat the first time and p0128 kept coming back so yes Mr Gasket os the way to go.
I had this same thing occur on my wife's V three times.
The first time it cleared itself up after a day. The next 2 times I cleared the code with a scanner and it went back to normal. So I'm not sure it's the thermostat at fault?
Yep it's the tstat. It'll be intermittent. You might not see it for months. But it'll be back. It's like herpes.
Hahha yeah thanks. Except this herpes has a cure. Replace the tstat.