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
- 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


