- 1998–2001 Factory-verified
2001 list adds AL2
QCB Factory-verified
Also documented for ChevroletOldsmobilePontiac
Documented applications
- 1998–2004 Factory-verified
2001 list adds AL2. The 2002–2004 lists read as the 2001 list.
This page aggregates every documented appearance of QCB in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.