160 thermostat help needed

I have a 2009 GT built 8/2008. I replaced the stock thermostat with a 160. Now, after 7 miles, the Contact Dealer messege appears, the A/c compressor shuts off and the temp guage stops working and reads 0 c in engineering mode. After 10 miles the check engine light comes on. I found the ONLY way to reset the system is to remove the postive battery cable, then everything works fine untill the next cold start, and the process starts over. I imagine the computer senses the engine has not reached operating temp in xxx number of miles/minutes and discards the 160 reading figuring its a false reading. A 18O thermostat works great, but I prefer the 160. Has anybody had this problem..Thanks.