- 2025–2026 Factory-verified
PHY Factory-verified
Also documented for CadillacChevrolet
Documented applications
- 2025–2026 Factory-verified
not available with the Extreme Off-Road Package (Z6X). 2025: S in 1SF; O in 1SG; 2026: S in 3VL, 1SF; O in 1SG.
This page aggregates every documented appearance of PHY in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.