GMPartsGiant.com offers the wholesale prices for genuine 2018 Chevrolet Sonic Sedan parts. Parts like Automatic Transmission Oil Pump are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 1.4L, 4 Cyl 1.8L. Model Code: LS 4 DOOR NOTCHBACK/SEDAN, LT 4 DOOR NOTCHBACK/SEDAN, LTZ 4 DOOR NOTCHBACK/SEDAN.