What are the OBD-II communication protocols?
Quick Answer
Common families are J1850 PWM/VPW, ISO 9141-2, ISO 14230-4 and ISO 15765-4 CAN; verify tool and vehicle coverage.
Common OBD-II communication families include SAE J1850 PWM, SAE J1850 VPW, ISO 9141-2, ISO 14230-4 and ISO 15765-4 CAN. Which protocol and enhanced functions are supported depends on the vehicle. A code reader should support the required vehicle protocol; protocol support alone does not guarantee access to every module or manufacturer feature.