Service engine light, loss of power

[TahoeM3]

On the way to work this morning, my engine started trying to stall and lost power. The service engine light came on and I had to get off the freeway. This all started when I was entering the freeway on the onramp. I tried to restart it but the same thing happened...light on and no power.

After sitting at a gas station for a few minutes while I checked things like the gas cap and the oil level, it started up and ran ok but the light was still on. I drove it very slowly to the dealership and dropped it off.

Any ideas what this might be? I know there are literally hundreds of things that can cause the service engine light to come on but any known similar problems? I have an M3 also and this reminds me of the time my coils went out. The X5 is an '05 delivered in July and it doesnt seem likely that would be a problem in such a new vehicle.