U1L Factory-verified

GMC · Regular Production Option

Radio, AM stereo/FM stereo, seek/scan, auto reverse, music search, cassette, clock, ETR

Years 2004–05 Models 1 Factory citations 2
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Also documented for CadillacChevrolet

Documented applications

This page aggregates every documented appearance of U1L in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.