For the most part, ECM updates are not absolutely necessary - they usually make very minor corrections. If it is an important update (eg, loss-of-power fix), you will usually be notified (see stansens remark above). But you may have one of the offbeat problems that an update could fix (IMNSHO, not likely). There are several web sites that will allow you to search recalls and TSBs. If a web search doesn't give any good answers, I suggest taking the car to another dealer and get them to run diagnostics.
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