- 2012 Confirmed
dropped for 2013 (GM Authority 2013 changes page); GM Authority's 2013 changes page, which prints "the official RPO list", credits GM for the codes
C4H Confirmed
Also documented for Saturn
Documented applications
This page aggregates every documented appearance of C4H in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.