Here is all the codes you can get out of the a/c control head
the code you are talking about I have never seen before and should not effect the a/c .So lets see if there is any other other codes in the system -you can do this on your own .Try this and see what codes you get ---start the car up and turn the a/c on and do this test
tell me what codes you come up with
I tried the self-test and received an Intermittent Run-Time Faults Code 155 in the dispaly. Per the codes listed on the attached sheet it is a NGS DTC U1235, DTC caused by MC - Invalid Code, do not service. Not sure what all this means but it appears to come back to the Message Center.
Is there a source for the Message Center?
The code is just stating that it can not communicate with the message center -- the a/c system does not need the message center to work ,, it just gives the message center info ,,, the message center does not give the a/c system info ---that why it states do not service --its a problem with the message center and it does not effect the a/c ---- I think you just have a basic a/c system problem ,, like low on freon ,, or cooling fan problem -- basic stuff --- the tech may have seen this code and stopped all diag and never check your pressures in the a/c system , or if your freon level was ok, I would get a second opinion on this problem ---and if it pans out to be a basic a/c problem , like a leak ,, then you can get your money back from the other diag ---- or if you want to take a look for your self ,,, look under the hood and start at the a/c compressor and look for a leak ,, if there was if leak it would look oily and wet ,, then work your way down the a/c lines for wetness---- to me this just sounds like a low freon problem --when you have a low freon problem the a/c compressor will cycle fast ,,, on for 5-10 seconds then off then back on for 5-10 seconds then off ----with a full charge the a/c compressor would stay on longer , like 60 seconds then off