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In automotive electronics, an 'electronic control unit' (ECU), also called a control unit or control module, is an embedded system that controls one or more of the electrical subsystems in a vehicle. Some modern cars have up to 70 ECUs, including:

★ Engine Control Unit

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★ also called Powertrain Control Module (PCM)

★ Transmission Control Unit - TCU

★ Telephone Control Unit - TCU

★ Man Machine Interface - MMI

★ Door Control unit

★ Seat Control Unit

★ Climate Control Unit
Managing the increasing complexity of ECUs and number of ECUs in a vehicle has become a key challenge for OEMs.
"Electronic Control Unit" is also the name of a song by Peter Gabriel