C99 Factory-verified

GMC · Regular Production Option

Switch, inflatable restraint, instrument panel module, manual suppression

Years 2003–10, 2014–19, 2022–27 Models 2 Factory citations 22

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Also described as Air bag deactivation switch, front passenger

Also documented for Chevrolet Hummer Pontiac

Documented applications

Savana — GMT610 (2003–2027)

2003–2010, 2014–2018, 2022–2027 Factory-verified

the 2025–2027 guides read Airbag deactivation switch, frontal passenger-side; S: Cargo 1WT, Cutaway 1WT, Cutaway 2WT (2025–2026), Passenger 1LS, Passenger 1LT

GM factory document — 2003 gmc savana rpo code list, p.1.
GM factory document — 2008 gmc savana rpo code list, p.1.
GM factory document — 2008 chevrolet ld electricalfullsizevans, p.16.
GM factory document — 2009 gmc savana rpo code list, p.1.
GM factory document — 2009 chevrolet ld electricalfullsizevans 100813, p.14.
GM factory document — 2010 chevrolet gh van elec 1 7 d1 100813, p.14.
GM factory document — 2014 chevrolet gh van elec bbm si brief, p.6.
GM factory document — 2018 chevrolet 18 express savana bodybuilders sm 2017nov06, p.15.
GM factory document — 2022 chevrolet 22 express savana electrical body builder sm en us 2021oct12, p.13.
GM factory document — 2025 chevrolet my25 express savana electrical bbm, p.11.
GM factory document — 2025 gmc savana cargo fleet order guide, p.19.
GM factory document — 2025 gmc savana cutaway fleet order guide, p.24.
GM factory document — 2025 gmc savana passenger fleet order guide, p.15.
GM factory document — 2026 chevrolet my26 express savana electrical bbm, p.11.
GM factory document — 2026 gmc savana cargo fleet order guide, p.20.
GM factory document — 2026 gmc savana cutaway fleet order guide, p.25.
GM factory document — 2026 gmc savana passenger fleet order guide, p.16.
GM factory document — 2027 gmc savana cargo fleet order guide, p.18.
GM factory document — 2027 gmc savana cutaway fleet order guide, p.13.
GM factory document — 2027 gmc savana passenger fleet order guide, p.15.

Sierra HD — K2XX (2015–2019)

2018–2019 Factory-verified

with the pickup box delete (ZW9) on Double Cab and Regular Cab; 2019 marks: Sierra, SLE: O; SLT: not offered; 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.32.

This page aggregates every documented appearance of C99 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.