2005 Cadillac STS, flood car

Just bought it off an auction site.  It came w/o keys or fobs.  I  bought key and one fob at dealer.  Key worked on door but RFID FOB not detected.  I found/used programming procedure for fob, no luck. 

GM parts guys (at dealer) advises I need to tow car to dealership so they can program FOB to computer (ECM or BCM, I don't recall which).  

Questions:  Can I remove ECM/BCM and take it to dealership along with key & FOB without taking the car?  Can they program it on another PK3 equipped car?  I live out in the country so towing is $$ and a hassle.

2nd Question:  Is there a way to force the car to learn the new FOB?

thanks in advance for your assistance, Carlos

So the car won't even let you start it with the new key????

I don't think it has the smart tech key in that car,not to sure about GM

But if you can start the car,just forget the factory key fob and install a new aftermarket unit

Now that its a flood car,the ECM could of sorted out thats why it won't hold the key fob

thanks for the reply....

I opened the bottom dash and the BCM & wiring looks like new, no hint of water or corrosion.

I realize it is a risk but to be honest it the only way I could get into a new STS.  BCM and wiring looks new, no signs of water under dash.  I appreciate your response.

Key was fine, worked from the time I had it made at the Caddy dealer.  It was the Fob needed to be programmed.  I found a helpful parts guy at the local GM dealer and he got me in to the service dept.. 

At first the Tech2 would not communicate at all (no comm.) with any of the modules.  They called GM for assistance. GM emailed them the exact same procedure they were already using (method 4-PK3 Fob programming).   I had bought the factory service manuals and recalled reading about the use of the CANDI module and asked if they would try it.  The put it between the Tech2 and the DLC connector and after a few menu selections it started communicating. 

We then went through the long process of erasing existing FOBs and reprogramming my newly purchased one. Tech2 display first showed not programmed but then showed it was programmed. Tried a few of the buttons and the car came to live (big smile). 

The service guys asked if I wanted to try starting the car and I said yes (if it didnt work at home I was stuck trying to diagnose without a Tech2).  He hit the start button and the engine started...... roughly, smoke out the back. stayed on for minute or two and then died.  We all suspected bad gas (tank showed 3/4 full.   Towed the car home so I could siphon the gas.  Put new regular gas in it has been running smoothly so far.....   I have bought an OBD II unit and will not work my way through remaining issues.

If anyone is interested, I'll keep you guys posted.   

PS...   Nice riding car.