I have a 2005 Yukon XL 1500 SLT and both the service stability and service ride control messages are on. The first the srevice stability was just on and abs engaging so i changed the wheel hub and sensor. That stopped for about an hour now both messages are up. Truck drives normal and i just don't know what to do now. I also changed the driver's rear position sensor. All help will be appreciated. Thanks!!