Radio, AM/FM stereo, seek/scan, clock (European frequencies)

Years 1983, 1985, 1999–01 Models 4 Factory citations 7

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Also described as Radio, AM/FM stereo, clock, ETRRadio, AM/FM stereo, seek/scan, clock, ETR, European frequencies

Also documented for Cadillac Chevrolet Hummer

Documented applications

Sierra — GMT800 (1999–2007)

1999–2001 Factory-verified

GM factory document — 1999 gmc gmc c sierra 2wd rpo code list, p.1.
GM factory document — 2001 gmc gmc c sierra 2wd rpo code list, p.1.

Sierra HD — GMT800 (2001–2007)

2001 Factory-verified

GM factory document — 2001 gmc gmc c sierra 2wd rpo code list, p.1.

Sonoma — first generation (1982–1993)

1983, 1985 Factory-verified

1983 from the U66 speaker requirement remark; GM's later lists use UL1 for a European frequency radio; shared S-series code; cited from the joint S-10/S-15 pages of the S-10 kits

GM Heritage factory kit — 1983 Chevrolet S 10, p.30.
GM Heritage factory kit — 1985 Chevrolet S 10, p.24.

Yukon — GMT800 (2000–2006)

2000–2001 Factory-verified

the 2000 list adds that it is the base radio on all models for European export and requires UL2

GM factory document — 2000 gmc yukon 2wd rpo code list, p.1.
GM factory document — 2001 gmc yukon 2wd rpo code list, p.1.

This page aggregates every documented appearance of UL1 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.