Hi, I was trying to program a new key for a 2010 Ford Escape 3.0L.  The customer had only one key and I wanted to add an additional key.  I was able to get access to PATS using the service menu and when I hit add additional keys it says failed to communicate with module.  I was thinking about doing a parameter reset but it said I need two serviceable keys available. I only have 1 key that is programmed and 1 new key so I stopped. I was afraid of wiping out all the keys for the vehicle or worse wiping all keys and not being able to add any keys. I did not try from the diagnostic menu yet and I am waiting for vehicle to come back.  Any suggestions would be much appreciated.

 Hi Ede and Kawracerx
Thanks for your help.  I finally got the car back yesterday.  I don't think there is a problem with the link.  I tried to add keys in both service and diagonistic and would not let me in.  I did what you said ede and I erased the keys and was able to program 2 new keys. The new key was an ebay clone one and it worked without any problems.  I wish I saw kawracerx post before the vehicle came in and would like to have tried his option to see if it worked.  When I was trying to add the key I did have the original key in the ignition and not the new key.  Hopefully next time I can try the add key function to see if it works.  Thanks Ede and Kawracerx for your help.