- C3 – Computer Command Control system (GM)
- C4 – Computer Controlled Catalytic Converter system (GM)
- CAS – Clean Air System (Chrysler)
- CCC – Computer Command Control system (GM)
- CVCC – Compound Vortex Controlled Combustion system (Honda)
- ECCS – Electronic Concentrated Control System (Nissan)
- EEC – Electronic Engine Control (Ford)
- ELB – Electronic Lean Burn (Chrysler)
- MCU – Microprocessor Controlled Unit (Ford)
- MISAR – Microprocessed Sensing and Automatic Regulation (GM)
- PGM-FI – Programmed Gas Management Fuel Injection (Honda)
- SCC – Spark Control Computer (Chrysler)
- TCCS – Toyota Computer Controlled System