LAUNCH CreaderV User’s Manualcommanded 'on' or 'off';2) Which, if any, Diagnostic Trouble Codes (DTCs) are stored;3) Readiness Monitor status.2.2 Diagnostic Trouble Codes (DTCs)OBD II Diagnostic Trouble Codes are codes that are stored by theon-board computer diagnostic system in response to a problem found inthe vehicle. These codes identify a particular problem area and areintended to provide you with a guide as to where a fault might beoccurring within a vehicle. OBD II Diagnostic Trouble Codes consist of afive-digit alphanumeric code. The first character, a letter, identifies whichcontrol system sets the code. The other four characters, all numbers,provide additional information on where the DTC originated and theoperating conditions that caused it to set. Here below is an example toillustrate the structure of the digits:4