2.2 Diagnostic Trouble Codes (DTCs)
OBD II Diagnostic Trouble Codes are codes that are stored by the on-board
computer diagnostic system in response to a problem found in the vehicle.
These codes identify a particular problem area and are intended to provide
you with a guide as to where a fault might be occurring within a vehicle. OBD
II Diagnostic Trouble Codes consist of a five-digit alphanumeric code. The
first character, a letter, identifies which control system sets the code. The
second character, a number, 0-3; other three characters, a hex character, 0-9
or A-F provide additional information on where the DTC originated and the
operating conditions that caused it to set. Here below is an example to
illustrate the structure of the digits:
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