DC Direct current

DCT Dual clutch transmission

DDE Digital Diesel Electronics - diesel engine management system (Bosch)

DfT Department for Transport (UK)

DI Direct injection

DIN Deutsches Institut für Normung - German standards institute

DIS Direct ignition system or Distributorless ignition system

DLO Daylight opening

DME Digital Motor Electronics - petrol engine management system (Bosch)

DOHC Double overhead camshaft

DOT Department of Transport (UK DOT replaced by DfT)

DPF Diesel particulate filter

DRG Down the road graphics

DRL Daytime running lights

DRS Drag reduction system

DSC Dynamic stability control, also known as Electronic stability control

DSG Direct Shift Gearbox (Volkswagen)