- 2015–2017, 2019, 2021–2022 Factory-verified
2015–2016: SLE: O; SL, Canyon, SLT: not offered; 2021: AT4: S; Elevation Standard, Elevation, Denali: not offered
R1U Factory-verified
Also documented for CadillacChevrolet
Documented applications
This page aggregates every documented appearance of R1U in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.