GMPartsGiant.com offers the wholesale prices for genuine 2001 GMC Sonoma 4WD parts. Parts like Wiring Harness/Engine are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.2L Flex, 6 Cyl 4.3L. Model Code: 4 DOOR, PICKUP, PICKUP EXTENDED CAB.