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How to Read OBD2 Fault Codes
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| Diagnostic Trouble Codes (DTCs)
When the PCM recognizes and identifies a problem a DTC for that fault is stored in its memory. These codes are intended to help you determine the root cause of the failure. The diagnostic codes that are required by law on all OBDII systems are standardized and all vehicle manufacturers use the same common code list. This means the misfire code P0300 represents the same failure on a Chevy, Chrysler, Ford, or Toyota. OBD II DTCs consist of a five-digit alphanumeric code. The DTC format and general code types are shown in this chart . 
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