- 2014 Confirmed
code printed C3O, with the letter O (C30 in GM's other lists is a fuel filter heater); GM Authority 2014 RPO list
C3O Factory-verified
Documented applications
- 2016, 2019 Factory-verified
code printed C3O, with the letter O (C30 in GM's other lists is a different part);
This page aggregates every documented appearance of C3O in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.