ATF - Automatic Transmission Fluid
BCM - Body Control Module
CPS - Crank Position Sensor
CAT - Catalytic Converter
ECM - Engine Control Module ( Sometimes referred to as  the PCM )
EFI - Electronic Fuel Injection
EPROM - Erasable Programmable Read Only Memory
GPS - Global Positioning Sensor
GVW - Gross Vehicle Weight
LED - Light Emitting Diode
LWB - Long Wheel Base
MAFS - Mass Air Flow Sensor
OBD - On Board Diagnostics
RPM - Revolutions Per Minute
SOHC - Single Overhead Cam