Exhaust gas pressure fault, CM871

[JMBT]

Hello, I am asking this for a friend trying to help him diagnose and fix a problem out on the road.
He does not have Insite on the truck with him.

2008 Pete 386, CM871 factory 600hp, 200K on inframe, properly demandated by one of this sites Gurus.

Dash shows a red triangle and a number one. text on the dash screen says "exhaust gas pressure".

Since is was properly demandated and both the DPF and DOC completely hollowed out, and at the time also the sensor feeder tube was blown clean and EGP sensor replaced, I am suspecting the sensor failed.

My question: If he replaces the sensor but does not have Insite to clear the code will the truck clear the dash code and light itself after the repair has been made? Or is Insite required to shut off the dash light?

Thanks, JMBT