ISB in limp mode/No Codes

[mayhem1]

Have a 2011 Ford F650 Cummins ISB that came in with DEF tank issues which turned into multiple codes. After repairing tank(changed tank module), cleared codes and did a regen. Had a NOX sensor problem. Replaced and there are no codes at all on engine. Body controller has a cruise switch code and the Wabco brakes have two codes, but nothing that I think would put it in limp mode(10 MPH). I went in and reset dpf filter. It ran down the road once and now it stays in limp mode. Do I need to get the ECM reflashed? There is no telling how long they have operated this truck with def tank problems...I'm sure till it would not run period. I'm stumped.

[Rawze]

(06-26-2019 )mayhem1 Wrote:  ...
I went in and reset dpf filter.
...

you should never do this unless you have pulled the DOC and DPF and had them professionally baked, de-ashed, and flow-tested. - Doing so throws the entire system off and makes it worse.

your next move it to remove them and actually have it done... THEN do a proper reset.

Also have the SCR can flow tested or inspected for restriction,. and do an thorough EGR tune-up, fix all problems that may be making it produce too much soot, fix any problems that lower fuel mileage, etc. + change oil at short intervals to de-soot the engine.


-- Sounds like you have one seriously neglected truck on your hands there.