[5point7]

CEL came on while driving down the freeway to work about 3 weeks ago. Did not cycle off in the normal 3 modes. It was P0128 - called dealer and it's related to coolant temp. I reset code, and have been monitoring the temp through the EVIC, and it does not warm up while driving. Would only reach operating temp (195-205) if stopped at lights or in slow traffic, but if I just drove it without stopping, temp would stay around 170* (acting like Tstat is stuck open).

Dealer got Chrysler to authorize the tstat to be warrantied, but also stated Chrysler commented they are having issues with CAI's and the (metal) tubes causing the CEL's because of the air intake sensor - I have a Volant with a plastic tube..so I know it's not related, AND, My dealer Chrysler the CAI would have nothing to do with coolant temp.... (I have a great dealer BTW).

I'll have it back tomorrow with a new tstat, and will update the post as to whether it's fixed.

I have not changed the tstat - anyone that changed their tstat to a 170 or 180 get a CEL yet?

In the meantime, at least I have a new Durango HEMI for my rental car :wave:

 

[Classy300C]

I have a Mopar CAI and a 170 degree Tstat on my car for about a month and have had no codes at all.

 

[5point7]

Update:

Tstat replaced under warranty - seems to have fixed the issue.

 

[HaTaX]

Just got this code as well.
I am running the superchips programer and the Volant CAI as well.

I will call the dealer and see what they say. Ocurred at 37K but I have an extended warranty and it's an 05.

I noticed that its not getting up to operating temp either... Hmmmm

 

[rmedina]

Same here. My code popped up a few weeks ago. I've had a 180 tstat for about 8 months without any problems. We had a minor cold front come in here in San Antonio. It got down to a bone chilling 55 degrees:scared: . I guess thats why the code popped up. The dealer replaced it without any problems.

 

[NYC_SRT8]

Personally I have the motorad 180 thermostat. Haven't gotten any codes till I went to the track and left the fan on (25 cent mod...its over on the lxforums). The car got down to 176 and the check engine light popped up with same code mentioned above. Once I turned the fan mode off and pulled fuse 11 the code clears and never seen it again. I live in nyc and the outside temperature is around 45 now.

Will

 

[DESIREE]

Update:

Tstat replaced under warranty - seems to have fixed the issue.

Very interesting, ESPECIALLY in light of what I discovered today while replacing my stock t-stat with a 180*F unit.
Take a look at this:

The stock t-stat has some kind of rubber coating around the edges of the top and solid across the bottom. As can be seen, a major chunk of the upper edge has come apart, this at 25K miles. If that loosey-goosey edge hangs over the edge of the disc as it closes it could bypass coolant which might result in low operating temperatures, and perhaps a CEL?
I've never seen any rubber on any t-stat before. After seeing this I'd have to classify it as a bad idea.