The key should have a chip. I would think the car would not even start for 2 seconds without, but I don't know this for sure. If you only have one key, you should order a spare.
You should always have a spare RCM even if it not the issue. You will need it eventually. A Smith RCM? What part number is it?
Take a look at threads about the SKREEM if the RCM does not solve your issue.