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There are two kinds of DTCs. The first is a "Current" code, which is designated with a letter suffix "C." A Current code indicates a malfunction is present at this time. The second is a "History" code, which is designated with a letter suffix "H." A History code indicates that a malfunction was present at some time in the past 40 to 50 ignition cycles. A history code could indicate the presence of an intermittent fault.