<s>
An	O
electronic	B-Device
control	I-Device
unit	I-Device
(	O
ECU	O
)	O
,	O
also	O
known	O
as	O
an	O
electronic	B-Device
control	I-Device
module	I-Device
(	O
ECM	O
)	O
,	O
is	O
an	O
embedded	B-Architecture
system	I-Architecture
in	O
automotive	O
electronics	O
that	O
controls	O
one	O
or	O
more	O
of	O
the	O
electrical	O
systems	O
or	O
subsystems	O
in	O
a	O
car	O
or	O
other	O
motor	O
vehicle	O
.	O
</s>
<s>
Modern	O
vehicles	O
have	O
many	O
ECUs	O
,	O
and	O
these	O
can	O
include	O
some	O
or	O
all	O
of	O
the	O
following	O
:	O
engine	B-Device
control	I-Device
module	I-Device
(	O
ECM	O
)	O
,	O
powertrain	B-Device
control	I-Device
module	I-Device
(	O
PCM	O
)	O
,	O
transmission	O
control	O
module	O
(	O
TCM	O
)	O
,	O
brake	O
control	O
module	O
(	O
BCM	O
or	O
EBCM	O
)	O
,	O
central	O
control	O
module	O
(	O
CCM	O
)	O
,	O
central	O
timing	O
module	O
(	O
CTM	O
)	O
,	O
general	O
electronic	O
module	O
(	O
GEM	O
)	O
,	O
body	O
control	O
module	O
(	O
BCM	O
)	O
,	O
and	O
suspension	O
control	O
module	O
(	O
SCM	O
)	O
.	O
</s>
<s>
Embedded	B-Application
software	I-Application
in	O
ECUs	O
continues	O
to	O
increase	O
in	O
line	O
count	O
,	O
complexity	O
,	O
and	O
sophistication	O
.	O
</s>
<s>
Powertrain	B-Device
control	I-Device
module	I-Device
(	O
PCM	O
)	O
:	O
Sometimes	O
the	O
functions	O
of	O
the	O
Engine	B-Device
Control	I-Device
Unit	I-Device
and	O
transmission	O
control	O
module	O
(	O
TCM	O
)	O
are	O
combined	O
into	O
a	O
single	O
unit	O
called	O
the	O
Powertrain	B-Device
Control	I-Device
Module	I-Device
.	O
</s>
