12D Factory-verified

GMC · Regular Production Option

Trim combination, cloth, Graphite (D)

Years 1998–00 Models 2 Factory citations 6
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Also documented for BuickChevroletOldsmobilePontiac

Documented applications

This page aggregates every documented appearance of 12D in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.