W28 ● Confirmed

Cadillac · Regular Production Option

Rear seat armrest, redundant radio controls

Years 2014–15 Models 1

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Documented applications

XTS — Epsilon II, enlarged (2013–2019) →

• 2014–2015 ● Confirmed

  2014: new for the model year (GM Authority 2014 XTS changes; GM Authority 2014 XTS Professional changes); 2015: Platinum and Vsport Platinum Collections (GM Authority 2015 XTS changes)

This page aggregates every documented appearance of W28 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.