MYC Factory-verified

GMC · Regular Production Option

Transmission, 6 speed automatic, 6L80

Years 2007–09, 2014–20, 2022 Models 6 Factory citations 20

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Also described as Transmission, automatic, 6 speed, HMD, 6L80Transmission, 6 speed automatic

Also documented for Cadillac Chevrolet Hummer Pontiac

Documented applications

Sierra — GMT900 (2007–2013)

2009 Factory-verified

GM factory document — 2009 gmc sierra 2wd rpo code list, p.1.

Sierra — K2XX (2014–2019)

2014, 2016–2019 Factory-verified

electronically controlled with overdrive and tow/haul mode; the 2017 manual names it 6L80.

GM factory document — 2014 gmc sierra 1500 fleet order guide wayback, p.4.
GM factory document — 2016 gmc sierra 1500 fleet order guide wayback, p.4.
GM factory document — 2017 chevrolet sierra silverado electrical body builders manual service manual 2017 en us, p.24.
GM factory document — 2018 gmc sierra 1500 order guide copy gm authority, p.89.
GM factory document — 2019 gmc sierra 1500 limited double cab k2xx order guide copy gm authority, p.40.

Sierra — T1XX (2019–2026)

2019–2020, 2022 Factory-verified

HMD, 6L80

GM factory document — 2019 gmc 19 sierra 1500 body builder feb 20, p.12.
GM factory document — 2020 gmc 20 sierra 1500 electrical body buil 1, p.13.
GM factory document — 2022 gmc 22 sierra 1500 new electrical body builder sm en us 2022jul20, p.12.

Yukon — GMT900 (2007–2014)

2007–2009 Factory-verified

Some 2007 and 2008 entries read 6L80-E; Wikipedia names the 6 speed 6L80 automatic.

GM factory document — 2007 gmc yukon 2wd rpo code list, p.1.
GM factory document — 2009 gmc yukon 2wd rpo code list, p.1.
GM factory document — 2008 gmc yukon 2wd rpo code list, p.1.

Yukon — K2XX (2015–2020)

2015–2018 Factory-verified

2015–2018: SLE, SLT: S; Denali: not offered; the guides add tow/haul mode and tap up/tap down shifting; the lists add HMD; 2018 from GM's 2018 Yukon order guide

GM factory document — 2015 gmc yukon denali fleet order guide wayback, p.4.
GM factory document — 2016 gmc yukon denali fleet order guide wayback, p.4.
GM factory document — 2017 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2017 en us 1, p.24.
GM factory document — 2018 gmc yukon order guide copy gm authority, p.34.
2019–2020 Single-source

GM Authority's 2019 Yukon page (its Yukon rows, read for the Yukon XL doc) and 2020 Yukon page (powertrain table); no factory list or order guide read for 2019 or 2020; the pages do not credit GM for their codes

Yukon XL — K2XX (2015–2020)

2015–2017 Factory-verified

2015: SLE, SLT: S; Denali: not available; the guides add tow/haul mode and tap up/tap down shifting

GM factory document — 2015 gmc yukon xl denali fleet order guide wayback, p.4, p.5.
GM factory document — 2016 gmc yukon xl denali fleet order guide wayback, p.4.
GM factory document — 2016 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2016 en us, p.10.
GM factory document — 2017 chevrolet escalade escalade esv suburban tahoe yukon yukon xl electrical body builders manual service manual 2017 en us 1, p.24.

This page aggregates every documented appearance of MYC in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.