R7M ✓ Factory-verified

Chevrolet · Regular Production Option

4500 HD Series

Years 2005–07, 2025–26 Models 2 Factory citations 5

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Also described as OnStar, delete

Documented applications

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.

TrailBlazer — GMT360 (2002–2009) →

• 2005–2007 ✓ Factory-verified

  the service lists do not print it

  ⛭ GM Heritage factory kit — 2005 Chevrolet Trailblazer, p.116.

  ⛭ GM Heritage factory kit — 2006 Chevrolet Trailblazer, p.130.

  ⛭ GM Heritage factory kit — 2007 Chevrolet Trailblazer, p.131.

This page aggregates every documented appearance of R7M in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.