Q:

What are OBD-II PIDs?

A:

Quick Answer

The acronym OBD-II PIDs stands for on-board diagnostics parameter IDs, which are codes diagnostic machines send to vehicles to request information. Information requested by the codes includes fuel pressure, engine RPM, control module voltage and intake air temperature.

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Full Answer

All vehicle manufacturers use the same codes, although regulations do not require that every vehicle support every code. Use of the codes has been required in all cars sold in North America since 1996, in all medium duty vehicles since 2005, and in heavy duty vehicles since 2010.

The codes feature nine modes of operation, including "show current data," "request vehicle information" and "clear diagnostic trouble codes." The number of codes within each mode ranges from one to several dozen.

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