UO401 code

curtis270

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Ive got this UO401 code twice now and am wondering what this could be my sct x4 says its invalid Data Received from ECM/PCM A. Hopefully my ECM/PCM isnt going bad. any help is appreciated
 

sootie

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it is a lost communication code. It shouldn't set a CEL and probably happens just after flashing?
 

curtis270

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no its been first start of the day both times gives me a wrench reduced engine power and service advance trac
 

sootie

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Any recent work on the truck such as cab removal etc? i would check the plug connections on the drivers fender as well as the three on the pcm. make sure they are seated fully, not corroded and apply dielectric grease.
 

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