We use cookies to give you the best possible experience on our website. ITS A CUMMINS ENGINE IN - Answered by a verified Technician. ![]() SPN 3362 FMI 31 SA 0 This code indicates a problem with the DEF system. Checking the LBCU showed two Engine faults: SPN 1569 FMI 31 SA 0 This code is a warning that the engine might de-rate, and must be associated with the exclamation mark. If this iKNow Article is being revised, please type in the text box below what has changed in the article.On April 29, 2018, my Cummins ISB6.7 showed two check-engine lights, and one had an exclamation mark. Title: SPN 3251 FMI 2 & 21 DPFDP above or below desired level diagnostics Applies To: 2010 + MaxxForce DT, 9, 10, N9 & N10 (ESN 3,300,000 and later) CHANGE LOG NOTE: DO NOT delete this Change Log.
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