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Had a P21DD fault (DEF heater 1). Dealer replaced DEF tank and miles later fuel filter change warning came on. It was replaced 8k ago. Reset timer. Faulted 100 miles later. Reset again 20 miles later it returned. What the heck is going on?

I am currently on way to Texas for new job pulling a trailer. Any ideas?
 

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Change the fuel filter.

Fuel filter has a sensor that measures the pressure drop across the filter -- so it's telling you it's getting plugged.

Completely unrelated to the DEF heater issue.
Sometimes it's an indication that some dirty fuel has been picked up, as the delco filters typically last longer than that.
 
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