Upside down triangle& beeping 07 Prostar ISX

[Aimeesfleetservice]

We recently acquired a fleet customer that has a large poorly maintained fleet of International Prostars with ISX engines . We are playing catch up every day . These trucks destroy VGT turbos and EGRs . We have got a handle on a lot of these trucks where they are staying on the road thanks to this site ..... My question is this : After an EGR clean out or swap and Turbo swap why do these trucks always go back into limp mode with the beeping and upside down triangle every time ???? Most start up sounding great then go back into limp mode . We are learning everyday about these engines .......... ...............also what is the correct procedure for a driver on the road to do a Regen ????? Thanks Aimee