- 2015–2017, 2019, 2021–2022 Factory-verified
2015–2016: S on all trims; 2021: Elevation Standard, Elevation, AT4: S; Denali: not offered
Also described as Audio system feature, 6 speaker systemAudio system feature, 6-speaker systemSpeaker system, enhanced audioSpeaker system, performance enhanced radioSpeaker system, performance (enhanced audio)Audio system, 6 speakersAudio system, 6 speaker
Also documented for BuickCadillacChevroletHummerOldsmobilePontiacSaturn
Documented applications
- 2023–2027 Factory-verified
2025: Elevation, AT4: S; Denali: not offered; 2026–2027: Elevation, AT4: S; AT4X, Denali: not offered; the upfitter lists name it enhanced audio speaker system
- 2004–2009 Factory-verified
the 2004-2006 lists print "Speaker System Performance, Enhanced Audio".
- 1998–2001 Factory-verified
- 2027 Factory-verified
Pro, Elevation: S; AT4, AT4X, Denali, Denali Ultimate: not offered
- 1998–2000 Factory-verified
- 1999–2007 Factory-verified
- 2009 Factory-verified
- 2001–2007 Factory-verified
- 2007–2009, 2014 Factory-verified
- 2015, 2018–2019 Factory-verified
2015 marks: Sierra, SLE, SLT: S; 2018: GM's 2018 Sierra 2500HD order guide
- 2014, 2016–2019 Factory-verified
the 2017 manual reads enhanced audio.
- 1998–2002 Factory-verified
- 1998–1999 Factory-verified
- 1998–1999 Factory-verified
- 2000–2006 Factory-verified
- 2007–2009 Factory-verified
This page aggregates every documented appearance of UQ3 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.