Vehicle exhibits steering wheel shake / shimmy at speeds above 50mph, sometimes severe. Repeated attempts at repair (currently 4 dealer visits), including application of service bulletin 19-na-240 does not correct the problem. GM has now indicated this is a "normal" condition, and will not authorize further warranty reimbursable labor for correction to dealer. This steering condition affects safety as it occurs in varying severity and with no warning, especially during driving over rough pavement / bumps, and has nearly lead to a loss of control of the truck. This condition was present at delivery of truck at 221 miles. Truck currently has 1688 miles.

- Niwot, CO, USA