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Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.
ok no problem , I will send you the trouble shoot for those codes back here
in few minute and you can reply back to me when ready & we can continue
i m online daily from 10 am till late
sorry you have been waiting i just seen your answer & i will try to help you with it
DTC p0401 egr
Trouble shoot tree.
how many miles
how is the truck running now ?
what have you done so far ?
can you run these test tree i sent you
Please let me know
ASE Certified Technician
1- are you getting ground from pcm to injectors ?are injectors firing ?
2- egr valve is it get correct power & ground ?
3- yes defentiley change fuel filter?
4- check all ground connection from block to frame ?
5- how did this start all these codes at once ?
it seems to me the injectors are leaking down or the computer keeping them on longer than it supposed to
are you looking at fixing this yourself or looking to know the most possible cause of this issue and taking it to repair shop for the work ?
Do you have any prior experience in electrical troubleshooting and testing with a test light for power & ground ?
good luck to you , i cant help on this one , you are just guessing at it, proper testing is needed .
i will open your question for another expert maybe they can
Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
Would you like me to try and help with this concern possibly related to the PCM?
Hello again Chris here,