| CAD | Computer Aided Design |
| CAE | Computer Aided Engineering |
| CAFE | Corporate Average Fuel Economy |
| CAHRD | Crash Active Head Rest Driver |
| CAHRP | Crash Active Head Rest Passenger |
| CAIO | Computer Aided Internal Optimization |
| cal | Calorie |
| CAL | Computer-Aided Lighting |
| CAM | computer-aided manufacturing |
| CAN | Controller Area Network |
| CAQ | Computer Aided Quality |
| CARB | California Air Resources Board |
| CARS | kohärente Anti-Stokes-Raman Spektrospie |
| Cartronic | Ordnungs- und Beschreibungskonzept |
| CAS | Chemical Abstract Service |
| CAS | Condition Analysis System |
| CAT | Computer Aided Testing |
| CATIA | ComputerAided Three dimensional Interaction Aapplication |
| CBS | Combined Brake System |
| CC-LS-System | Closed-Center Load Sensing System |
| CC-System | Closed-Center System |
| CCD | Charge-Coupled Device |
| CCFL | Cold-Cathode Flurescence Lamp |
| CCITT | Comité Consultativ International Télégraphique et Téléphonique |
| CCMC | Comité des Constructeurs d' Automobile |
| CD | Clarce Depleting |
| CD | Compact-Disc |
| CDC | Compact-Disc-Charge |
| CDD | Controlled Deceleration for Driver |
| CDI | Capacitor Discharge Ignition |
| CEC | Coordinating European Concil |
| CEG | Comfort Entry/Go-System |
| CEI | Constant End of Injection |
| CEN | European Committee for Standardization |
| CFC | Carbonate Fuel Cell |
| CFD | Computation Fluid Dynamics |
| CFI | Central Fuel Injection |
| CFK | Carbon Faser Kunststoff |
| CFPP | Cold Filter Plugging Point |
| CFR | Cooperative Fuel Research committee |
| CFV | Critical Flow Venturi |
| CGI | Compact Graphite Iron |
| CGPM | Conférence Générale des Poid |
| CID | Cylinder Identificaton Sensor |
| CIMAC | Conseil International des Machines'a Combustion |
| CIPG | Cured In Place Gasket |
| CISC | Complex -Instruction -Set Computin |
| CKD | Completely Knocked down |
| CLA | Center Line Average Value |
| CLD | Chemoluminescence Detector |
| CMOS | Complementary Metal Oxide Semiconductor |
| CMOS | Complementary MOS-Transistors |
| CMVSS | Canadian Motor Vehicle Safety |
| CNG | Compressed Natural Gas |
| COB | Chip on Board |
| COBOL | Common Business Oriental Language |
| COFDM | Coded Orthogonal Frequency |
| cop | carry over part |
| COP | Coefficient Of Perfomance |
| COP | Conformity of Production |
| CPS | Camshaft Profile Switching |
| CPSI | Cells Per SquareInch |
| CPU | Central Prossesing Unit |
| CRC | Cyclic Redundancy Check |
| CROD | Crash Output Digital |
| CRS | Common Rail System |
| CRT | Continuously Regenerating Trap |
| CS | Clarce Substaning |
| CT-Code | Clock /Time Code |
| CTS | Conti Tire Systems |
| CUNA | Commissione tecnica di Unificazione nell' Automobile |
| CVD | Chemical Vapor Deposition |
| CVH | Compound Valve angle Hemispherical combustion chamber |
| CVP | Canister Vapur Purge |
| CVS | Constant Volume Sampling |
| CVT | Continuously Variable Tansmission |
| CVTS | Contineous variable Tumble System |
| cwt | hunderd weight |
| CZ | Cetanzahl |
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