Help!

[maverickmagill]

Wondering if anyone else has had this problem to help me narrow it down
I’ve got a P0402 code for egr excessive overflow valve A
Also have abs traction control and trailer brake and electronic throttle control light on
I put a new MAF sensor in changed the bad wheel speed sensor cleaned the MAP sensor egr tube and throttle body out
Still the same nothing changed.. maybe pcm is going out? I have no idea and none of the shops around me know anything about ecodiesels either I had them scan it and they had no clue what to do they said they didn’t want to work on it because they didn’t want to just throw a bunch of parts at it and still not fix it. Any help is appreciated thanks

 

[Tremper126]

Sounds like a ground issue somewhere or possibly a weak battery voltage

 

[maverickmagill]

Thanks I will test the battery when I get home I hadn’t thought of anything like that

 

[Tremper126]

These newer trucks can get really stupid when the battery gets weak lol