- 2006–2009 Factory-verified
the 2006 lists print AL3 where the 2007-2009 lists print HWY.
QDG Factory-verified
Also documented for BuickChevroletPontiac
Documented applications
This page aggregates every documented appearance of QDG in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.