- 2017 Factory-verified
HD Radio is a free service; the 2017 guide prints it on its audio page only
U2M Factory-verified
Also described as Audio system feature, SiriusXM and HD Radio, SiriusXM 3-month trialSiriusXM Satellite Radio and HD Radio
Also documented for BuickCadillacChevrolet
Documented applications
- 2014 Factory-verified
- 2015 Factory-verified
2015: S on all trims; the 2016 guide splits it into U2K and U2L
- 2015 Factory-verified
S on all trims; not for fleet daily rental orders
This page aggregates every documented appearance of U2M in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.