B4P ✓ Factory-verified

Cadillac · Regular Production Option

Modification, noise control, transmission control module

Years 2005–07 Models 1 Factory citations 2

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Also documented for Chevrolet

Documented applications

XLR — Y-body (2004–2009) →

• 2005–2007 ✓ Factory-verified
  ⛭ GM factory document — 2005 cadillac xlr rpo code list, p.1.

  ⛭ GM factory document — 2007 cadillac xlr rpo code list, p.1.

This page aggregates every documented appearance of B4P in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.