Radio, AM/FM stereo, seek/scan, auto reverse music search cassette, compact disc, HPS, clock

Years 1999–02 Models 2 Factory citations 7

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Also documented for Buick Chevrolet Oldsmobile

Documented applications

Jimmy — second generation (1995–2001)

1999–2001 Factory-verified

1999 list reads compact disc, clock, ETR with no cassette

GM factory document — 1999 gmc jimmy 4wd rpo code list, p.1.
GM factory document — 2000 gmc jimmy 4wd rpo code list, p.1.
GM factory document — 2001 gmc jimmy 4wd rpo code list, p.1.

Sonoma — second generation (1994–2004)

1999–2002 Factory-verified

1999 list reads compact disc, clock, ETR with no cassette. The 2002 list reads as the 2001 list.

GM factory document — 1999 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 2000 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 2001 gmc sonoma pickup 4wd rpo code list, p.1.
GM factory document — 2002 gmc sonoma pickup 4wd rpo code list, p.1.

This page aggregates every documented appearance of U1F in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.