- 2025–2027 Factory-verified
2026 and 2027: included with A8H, PDM and the Denali packages; 2025: S in 5SC, 5SD; 2026: S in 4SD, 5SD; A in 3SC, 4SC, 5SC; not offered in 3SB, 5SB; 2027: S in 4SD, 5SD; A in 3SC, 4SC, 5SC; not offered in 3SB
WD9 Factory-verified
Also documented for Chevrolet
Documented applications
This page aggregates every documented appearance of WD9 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.