User Manual

NexLink NL102PLUS User Manual

2.2 Diagnostic Trouble Codes (DTCs)

Diagnostic Trouble Codes (DTC) 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.

2.2.1 OBDII DTC

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: