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Keyword Protocol 2000

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Keyword Protocol 2000, abbreviated KWP2000, is a communications protocol used for on-board vehicle diagnostics systems (OBD). The protocol is standardized by International Organization for Standardization as ISO 14230.

The physical layer is identical to ISO 9141-2, with bidirectional serial communication on a single line called the K-line. In addition, there is an optional L-line for wakeup. The data rate is between 1.2 and 10.4 kilobaud, and a message may contain up to 255 bytes in the data field.

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