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so if youamp;#39;ve worked on uh trucks often youamp;#39;ve probably numerous times come across these codes especially on trucks with cummins engines in them these are your def header malfunction codes diesel quality level and temperature um you weamp;#39;ve been going through headers like crazy replacing these and now with the parts shortage itamp;#39;s very hard to come across this and these codes will as you can see de-ra d-rate your truck and not allow you to drive so what cummins has done is theyamp;#39;ve come out with a temporary ecm code to let you bypass the header replacement until parts become available so thatamp;#39;s what iamp;#39;m going to show you how to do iamp;#39;m going to show you how to update the ecm temporarily so you can use the truck even though the def the def header is malfunctioning so the first thing youamp;#39;re going to need is youamp;#39;re going to need your engine serial number your ecm code and your ecm password which the engine serial nu
