- 2026–2027 Factory-verified
Denali Ultimate: S; Elevation, AT4, Denali: not offered; exclusive to Denali Ultimate
B54 Factory-verified
Also documented for BuickCadillacChevrolet
Documented applications
This page aggregates every documented appearance of B54 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.