- 2004–2009 Factory-verified
the 2005-2009 lists print C61; GM's other lists print C6I for 4,850 lbs (C61 elsewhere is automatic air conditioning).
C6I Factory-verified
Also described as GVW rating, 4,850 lbs
Also documented for ChevroletOldsmobile
Documented applications
- 1998–2001 Factory-verified
- 1998–2004 Factory-verified
This page aggregates every documented appearance of C6I in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.