Tailgate, remote locking

Years 2016–19, 2021–27 Models 5 Factory citations 15

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Also documented for Buick Chevrolet Oldsmobile Pontiac

Documented applications

Canyon — Second generation (GMT31XX) (2015–2022)

2021–2022 Factory-verified

2021: Elevation, AT4, Denali: S; Elevation Standard: O; the 2021 guide fits it with the Convenience package (PCM) in place of EN5; the upfitter list names it rear compartment lock control, remote control electric open and close

GM factory document — 2021 gmc canyon fleet order guide wayback, p.1.
GM factory document — 2022 chevrolet 22 canyon colorado electrical body builder sm en us 2021oct15, p.9.

Canyon — Third generation (VSS-T) (2023–2027)

2023–2027 Factory-verified

S on all trims; the upfitter lists read remote electric open and close

GM factory document — 2023 gmc 23canyon electrical body builder 2023march13, p.9.
GM factory document — 2024 gmc canyon fleet order guide wayback, p.1.
GM factory document — 2025 gmc canyon fleet order guide, p.5.
GM factory document — 2026 gmc canyon fleet order guide, p.6.
GM factory document — 2027 gmc canyon fleet order guide, p.6.

Sierra 1500 — Next-Generation (2027)

2027 Factory-verified

Pro: S; AT4, Elevation, AT4X, Denali, Denali Ultimate: not offered; locks and unlocks with the key fob

GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide, p.6.
GM factory document — 2027 gmc next generation sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

Sierra HD — K2XX (2015–2019)

2018–2019 Factory-verified

2018: GM's 2018 Sierra 2500HD order guide

GM factory document — 2019 gmc sierra 2500hd fleet order guide wayback, p.1.
GM factory document — 2018 gmc sierra 2500hd order guide copy gm authority, p.5.

Sierra — K2XX (2014–2019)

2016–2019 Factory-verified

new for 2016.

GM factory document — 2016 gmc sierra 1500 fleet order guide wayback, p.2.
GM factory document — 2017 chevrolet sierra silverado electrical body builders manual service manual 2017 en us, p.12.
GM factory document — 2018 gmc sierra 1500 order guide copy gm authority, p.87.
GM factory document — 2019 gmc sierra 1500 limited double cab k2xx order guide copy gm authority, p.39.

This page aggregates every documented appearance of A91 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.