Governor, electronic speed sensor, set to 55 MPH

Years 2001–02, 2025–26 Models 2 Factory citations 4

Query this via API →

Also described as Governor, electronic speed sensor, 55 MPH

Also documented for GMC

Documented applications

Express — GMT600 (1996–2002)

2001–2002 Factory-verified

GM factory document — 2001 chevrolet express rpo code list, p.1.
GM factory document — 2002 chevrolet express rpo code list, p.1.

Silverado Medium Duty (GM515, 2019–2026)

2025–2026 Factory-verified

GM factory document — 2025 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1.
GM factory document — 2026 chevrolet silverado 4500 hd 5500 hd and 6500 hd fleet order guide rpo codes, p.1.

This page aggregates every documented appearance of 9D4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.