Modification, noise control, transmission control module

Years 1986–89, 2006–09 Models 2 Factory citations 9

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Also described as Fan, radiator cooling boost

Also documented for Cadillac

Documented applications

Corvette — C4 (1984–1996)

1986–1989 Factory-verified

included in Z51 (1986–1988 order guides), and in Z52 in 1987–1988; the 1990 option weight page names it only inside the Z51 content, so 1990 is not claimed

GM Heritage factory kit — 1986 Chevrolet Corvette, p.80.
GM Heritage factory kit — 1987 Chevrolet Corvette, p.8.
GM Heritage factory kit — 1988 Chevrolet Corvette, p.34.
GM Heritage factory kit — 1989 Chevrolet Corvette, p.32.

Corvette — C6 (2005–2013)

2006–2009 Factory-verified

GM factory document — 2006 chevrolet corvette rpo code list, p.1.
GM factory document — 2007 chevrolet corvette rpo code list, p.1.
GM factory document — 2008 chevrolet corvette rpo code list, p.1.
GM factory document — 2009 chevrolet corvette rpo code list, p.1.
GM Heritage factory kit — 2006 Chevrolet Corvette, p.25.

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