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2018 f250 6.7L...I keep getting this communication code randomly U0401. If I pull off the road, cycle the key it’ll run fine for a few miles then start acting up. When the “see service manual” shows up on the dash with a wrench symbol the truck runs like crap. No power, idles awful, etc. it definitely seems to occur when it’s raining or roads are wet. Any ideas?
 

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You need a better diagnostic tool. Check all the sensors and their connections as well as their voltage output.

201706
 
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