Vibration in steering column

Hello all, on cold starts , besides my engine knocking, I also have a bad vibration in the steering column. The steering column will shake with the vibration until the vehicle warms up. After you have driven a little while and everything seems to warm up, the vibration goes away until the next cold start up. Any ideas?

On my 03 Yukon, the dealer told me there was a service bulliton on the steering column, somthing needing replacment etc. Call your dealer, you might get a warranty repair like I did...

Thanks for the reply, I will do that today.