- 2003–2007 Factory-verified
U1S Factory-verified
Also described as Multiple CD player (changer)
Also documented for BuickCadillacChevroletOldsmobilePontiacSaturn
Documented applications
- 2007–2008 Factory-verified
- 2003–2006 Factory-verified
This page aggregates every documented appearance of U1S in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.