Governor, electronic speed sensor set to 65 MPH

Years 1998–00, 2019–20, 2023, 2025–27 Models 4 Factory citations 23

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Also described as Governor, electronic speed sensor, 65 MPHGovernor, electronic speed sensor, 65 mph

Also documented for Chevrolet

Documented applications

Savana — GMT600 (1996–2002)

1998–2000 Factory-verified

GM factory document — 1998 gmc savana rpo code list, p.1.
GM factory document — 1999 gmc savana rpo code list, p.1.
GM factory document — 2000 gmc savana rpo code list, p.1.

Savana — GMT610 (2003–2027)

2023, 2025–2027 Factory-verified

O: Cargo 1WT, Cutaway 1WT, Cutaway 2WT (2025–2026), Passenger TG23406; not offered: Passenger 1LT, Passenger TG33406, Passenger TG33706

GM factory document — 2023 chevrolet 23 express savana body builder sm en us 2022sep13, p.12.
GM factory document — 2025 gmc savana cargo fleet order guide, p.39.
GM factory document — 2025 gmc savana cutaway fleet order guide, p.49.
GM factory document — 2025 gmc savana passenger fleet order guide, p.31.
GM factory document — 2026 gmc savana cargo fleet order guide, p.41.
GM factory document — 2026 gmc savana cutaway fleet order guide, p.53.
GM factory document — 2026 gmc savana passenger fleet order guide, p.32.
GM factory document — 2027 gmc savana cargo fleet order guide, p.38.
GM factory document — 2027 gmc savana cutaway fleet order guide, p.28.
GM factory document — 2027 gmc savana passenger fleet order guide, p.30.

Sierra HD — T1XX (2020–2027)

2025–2027 Factory-verified

limits road speed to 65 MPH and cruise control to 60 MPH; Pro, SLE: O; SLT, AT4, AT4X, Denali, Denali Ultimate: not offered

GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2025 gmc sierra 2500 hd retail and fleet fleet order guide, p.110.
GM factory document — 2026 gmc sierra 2500 hd retail and fleet fleet order guide, p.106.
GM factory document — 2027 gmc sierra 2500 hd retail and fleet fleet order guide, p.100.

Sierra — T1XX (2019–2026)

2019–2020, 2025–2026 Factory-verified

GM factory document — 2019 gmc 19 sierra 1500 body builder feb 20, p.9.
GM factory document — 2020 gmc 20 sierra 1500 electrical body buil 1, p.10.
GM factory document — 2025 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.
GM factory document — 2026 gmc sierra 1500 retail and fleet fleet order guide rpo codes, p.1.

This page aggregates every documented appearance of 9C2 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.