M15 Factory-verified

Buick · Regular Production Option

Transmission, automatic, 4 speed, HMD, 4T65-E, enhanced electronic

Years 1998–09 Models 9 Factory citations 34

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Also described as Transmission, automatic, 4 speed, 4T65-E, enhanced electronicTransmission, automatic 4 speed, HMD, 4T65E, enhanced electronic

Also documented for Chevrolet Oldsmobile Pontiac Saturn

Documented applications

Century — W-body (1997–2005)

1998–2005 Factory-verified

shared W-body code, Chevrolet Lumina kit

GM Heritage factory kit — 1998 Chevrolet Lumina, p.43.
GM Heritage factory kit — 1999 Chevrolet Lumina, p.59.
GM factory document — 1998 buick century rpo code list, p.1.
GM factory document — 1999 buick century rpo code list, p.1.
GM factory document — 2000 buick century rpo code list, p.1.
GM factory document — 2001 buick century rpo code list, p.1.
GM factory document — 2002 buick century rpo code list, p.1.
GM factory document — 2003 buick century rpo code list, p.1.
GM factory document — 2004 buick century rpo code list, p.1.
GM factory document — 2005 buick century rpo code list, p.1.

LaCrosse — W-body / GMX365 (2005–2009)

2005–2009 Factory-verified

4T65-E automatic (Wikipedia).

GM factory document — 2005 buick lacrosse rpo code list, p.1.
GM factory document — 2007 buick lacrosse rpo code list, p.1.
GM factory document — 2009 buick lacrosse rpo code list, p.1.

LeSabre — H-body (1992–1999)

1999 Factory-verified

GM factory document — 1999 buick lesabre rpo code list, p.1.

LeSabre — H-body (2000–2005)

2005 Factory-verified

GM factory document — 2005 buick lesabre rpo code list, p.1.

Lucerne — G-body (2006–2011)

2006–2009 Factory-verified

GM factory document — 2006 buick lucerne rpo code list, p.1.
GM factory document — 2009 buick lucerne rpo code list, p.1.

Park Avenue — G-body (1997–2005)

2005 Factory-verified

GM factory document — 2005 buick park avenue rpo code list, p.1.

Regal — W-body (1997–2004)

1998–2004 Factory-verified

shared W-body code, Chevrolet Lumina kit

GM Heritage factory kit — 1998 Chevrolet Lumina, p.43.
GM Heritage factory kit — 1999 Chevrolet Lumina, p.59.
GM factory document — 1998 buick regal rpo code list, p.1.
GM factory document — 1999 buick regal rpo code list, p.1.
GM factory document — 2000 buick regal rpo code list, p.1.
GM factory document — 2001 buick regal rpo code list, p.1.
GM factory document — 2002 buick regal rpo code list, p.1.
GM factory document — 2003 buick regal rpo code list, p.1.
GM factory document — 2004 buick regal rpo code list, p.1.

Rendezvous — U-body / GMT257 (2002–2007)

2002–2007 Factory-verified

The 2002 list adds "with 245 mm torque converter".

GM factory document — 2002 buick rendezvous awd rpo code list, p.1.
GM factory document — 2003 buick rendezvous awd rpo code list, p.1.
GM factory document — 2006 buick rendezvous awd rpo code list, p.1.
GM factory document — 2007 buick rendezvous fwd rpo code list, p.1.

Terraza — U-body / GMT201 (2005–2007)

2005–2007 Factory-verified

the 2005 and 2006 lists print 4 SPD

GM factory document — 2005 buick terraza rpo code list, p.1.
GM factory document — 2006 buick terraza rpo code list, p.1.
GM factory document — 2007 buick terraza rpo code list, p.1.

This page aggregates every documented appearance of M15 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.