Air conditioning not desired

Years 1997–99, 2016, 2025–26 Models 3 Factory citations 5

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Also described as Bi-fuel (CNG) verificationGCWR, 26,000 lb (11,793 kg)

Also documented for Cadillac

Documented applications

Cavalier — third generation (1995–2005)

1997–1999 Factory-verified

GM Heritage factory kit — 1997 Chevrolet Cavalier, p.89.
GM Heritage factory kit — 1999 Chevrolet Cavalier, p.9.

Impala — tenth generation (2014–2020)

2016 Factory-verified internal

; 2FL, 3LT: O; required on retail orders to confirm a bi-fuel CNG vehicle

GM factory document — 2016 chevrolet impala fleet order guide wayback, p.4.

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 R6G in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.