| BAS | Brake Apply Sensor |
| BATT | Battery |
| BBV | Brake Booster Vacuum |
| BCM | Body Control Module |
| BDFI | Biodiesel Flow Improvers |
| BDSI | Biodiesel Stability Improvers |
| BECU | Body Electronic Control Unit |
| BHP | Brake Horsepower |
| BMAP | Barometric and Manifold Absolute Pressure |
| BMW | Bayerische Motoren Werke (Bavarian Motor Works) |
| BN | Base Number |
| BNP | Bureau de Normalisation des Pétroles (France) |
| BOCLE | Ball On Cylinder Lubricity Evaluator |
| BOI | Base Oil Interchange |
| BP | Back Pressure |
| BPA | Bypass Air |
| BPCM | Battery Pack Control Module |
| BSI | British Standards Institution |
| BTC | British Technical Council of the Motor and Petroleum Industries |
| BTU | British Thermal Unit |
| BV | Battery Voltage |
