Transmission, automatic 5 speed, HMD, 5L50-E, electronic, O/D

Years 2004–06 Models 4 Factory citations 7

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Also documented for Chevrolet

Documented applications

CTS — Sigma / GMX320 (2003–2007)

2005 Factory-verified

2005 list only; also on the 2005 STS list. Pairs with the dropped LH2.

GM factory document — 2005 cadillac cts rpo code list, p.1.

SRX — Sigma / GMT265 (2004–2009)

2004–2006 Factory-verified

GM factory document — 2004 cadillac srx rpo code list, p.1.
GM factory document — 2006 cadillac srx rpo code list, p.1.

STS — Sigma (2005–2011)

2005, 2006 Factory-verified

The 2005 and 2006 STS lists print "6 Speed" with 5L50-E; the 2005 CTS list and most of GM's lists print 5 speed, which is used here. Pairs with the 4.6L LH2.

GM factory document — 2005 cadillac sts rpo code list, p.1.
GM factory document — 2006 cadillac sts rpo code list, p.1.

XLR — Y-body (2004–2009)

2004–2006 Factory-verified

Wikipedia names a 5 speed 5L50 automatic.

GM factory document — 2004 cadillac xlr rpo code list, p.1.
GM factory document — 2006 cadillac xlr rpo code list, p.1.

This page aggregates every documented appearance of M22 in the Cadillac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.