UO401 code

[curtis270]

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]

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

 

[curtis270]

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

 

[sootie]

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.

 

[curtis270]

No sir. OK ill check those thanks for the info!

 

[curtis270]

thats seemed to have fixed it so far thanks again.