Automotive
OBD-II
OBD-II (On-Board Diagnostics II) is the standardized diagnostic interface required on light-duty vehicles sold in most international markets. It exposes the vehicle's diagnostic protocol — typically over a CAN bus — through a physical 16-pin connector accessible from the driver's footwell.
Definition
OBD-II (On-Board Diagnostics II) is the standardized diagnostic interface required on light-duty vehicles sold in most international markets. It exposes the vehicle's diagnostic protocol — typically over a CAN bus — through a physical 16-pin connector accessible from the driver's footwell.
What it means
Mandated in the United States from model year 1996 and adopted internationally with regional variants (EOBD in the European Union, JOBD in Japan, CN-OBD in China), the OBD-II interface was designed for emissions and diagnostic purposes. It exposes parameter IDs (PIDs) for engine, transmission, and emissions data, plus the ability to clear diagnostic trouble codes (DTCs).
From a security perspective, OBD-II is the most common entry point for in-vehicle network attacks. The connector exposes raw CAN bus access without authentication. A connected OBD-II dongle (commercial telematics device, insurance monitoring, fleet management) extends this exposure to the cellular or Bluetooth network the dongle uses.
For Melina engagements, OBD-II testing covers: dongle firmware and cellular path security, CAN gateway behavior when OBD-II traffic appears, and the manufacturer's authentication strategy on diagnostic services (UDS — Unified Diagnostic Services per ISO 14229).
Related terms
Authoritative sources
- ISO 15031 (vehicle communication for off-board OBD) - SAE J1979-DA (E/E diagnostic test modes)
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