One problem related to engine exhaust system has been reported for the 2001 Chevrolet Silverado. The most recently reported issues are listed below.
On 3 of the only 4 occasions I have had to drive this vehicle at 70 mph for any extended period when outside temperatures exceeded 90, the following symptoms have manifested: loud engine knock sufficient to shake vehicle and discharge of large cloud of gray (not the black as is typical for a diesel) smoke. Numerous cars have driven off the road behind me to avoid the cloud of smoke that obscures their vision (and possibly to avoid parts from a motor they may think has blown up). Vehicle is presently at king Chevrolet, tyler, texas for 2nd time (not selling dealer) and had been at one other dealer; lewis Chevrolet, canton,texas. Problem has not been diagnosed. Dealers say that gm technicians say problem is unique - no other owners have reported this problem. Problem has been reported to gm which has assigned the complaint file #4913340. At time of this filing, it is unknown what, if any action GMC intends to take. I regard these symptoms as potentially hazardous to occupants of my vehicle. I regard the large and sudden exhaust discharges as being seriously hazardous to other motorists.