That was maybe 15 years ago. These days cars have multiple CANbus networks running and there are control unit everywhere.

Below the details for an Alfa Romeo Giulia, which is interesting because it was a complete new design when introduced in 2016, not a rework of a previous platform:

3 networks run in parallel: These networks and their subnetworks are protected by a Security Gateway Module (SGW).

  - CAN-C (high-speed 500 kb/s)
  - CAN-CH (high-speed 500 kb/s)
  - CAN-IHS (medium-speed 125 kb/s)

Modules connect to 1st network:

  - Body Control Module (BCM)
  - Instrument Panel Cluster (IPC)
  - Occupant Restraint Control (ORC)
  - Radio Frequency Hub (RFH) Module
  - Antilock Brake System Module (ABS)
  - Adaptive Cruise Control Module (ACC)
  - Emergency Assistance Module (EAM)
  - Primary Powertrain Control Module 2.9 V6 (PCM - P)
  - Powertrain Control Module 2.0 I4 DI (PCM)

To 2nd network:

  - ABS Module
  - BCM
  - Electric Steering Lock (ESL)
  - Park Assist Module (PAM)
  - Electric Power Steering (EPS)
  - FFCM - Haptic Lane Feedback (FFCM - HALF)
  - Occupant Restraint Control (ORC)
  - Active Aerodynamic Module Left – Front left Splitter actuator (AAML)
  - Active Aerodynamic Module Right – Front right Splitter actuator (AAMR)
  - Adaptive Front Light System (AFLS)
  - Chassis Domain Control Module (CDCM)
  - Torque Vectoring Module (TVM)

To 3rd network:

  - Instrument Panel Cluster (IPC)
  - Comfort Seat Wheel Module (CSWM)
  - Left Blind Spot Sensor (LBSS)
  - Right Blind Spot Sensor (RBSS)
  - Amplifier (AMP)
  - Trailer Tow Module (TTM)
  - Heating Ventilation and Air Conditioning (HVAC)
  - Entertainment Telematic Module VP2, VP4 (ETM)
  - BCM
  - Entertainment Multimedia Control Module (EMCM)
  - Secondary Powertrain Control Module 2.9 V6 (PCM - S)

ECU is abbreviation for Electronic Control Unit in automotive. (And a modern car may actually have multiple ECUs controlling the engine(s), especially if it is a hybrid=HEV, plugin HEV=PHEV or battery electric vehicle=BEV.)