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so if youve worked on uh trucks often youve 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 weve been going through headers like crazy replacing these and now with the parts shortage its 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 theyve come out with a temporary ecm code to let you bypass the header replacement until parts become available so thats what im going to show you how to do im 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 youre going to need is youre going to need your engine serial number your ecm code and your ecm password which the engine serial number can be found here and the ecm code can be found here so before you move on