Since you mentioned that you have the VTSS (SKIM), then I guess your key is the gret head key.
There really is no way to bypass the SKIM system you have.
I would think to start is the key itself is having a problem (A micro-chip under the grey rubber). You would have to get another key from the dealer that is programmed to your car.
The key wearing out is the most common from what I have seen go wrong with them. When I was in College, I saw where the chip on the key go bad and cause the car to shut down and not run. 3 treid with a dead chipped key, or a non-chipped key will cause the PCM to lock down until the SKIM Module gets the correct information to unlock it.
The only other fix to your problem is getting another PCM, BCM, SKIM, and Key (All have to come from the same car) from the junkyard and install it into your car. You would have to Zip tie the key to the SKIM Module so that the car can start up. The down fall to that is the fact that anyone can start the car without having the SKIM there to keep the car from being stolen