My service 4 wheel drive came on and it tries to engage 4 wheel drive on its own on 2008 Chevrolet Silverado 1500

I started the truck and started driving and the service 4 wheel drive came on, check engine light, abs light, and brake light all came on and sometimes the truck tries to engage 4 wheel drive on its on.

by in Runge, TX on January 30, 2013
1 answer
ANSWER by on January 30, 2013
what are the codes?