1. A method for fault data correlation in a diagnostic system, comprising: receiving the fault data including a plurality of faults collected over a period of time; identifying a plurality of episodes within the fault data, wherein each episode includes a sequence of the faults; calculating a frequency of the episodes within the fault data; categorizing each of the episodes as an episode type, wherein the episode type is one of a well-known episode, an expected episode, and an unexpected episode; calculating a correlation confidence of the faults relative to the episodes as a function of the frequency of the episodes; outputting a report of the faults with the correlation confidence; and filtering the report as a function of the episode type.