daniel179

Nothing has been done to the truck as far as a delete or anything else. It has a mack 18 speed manual. It is a company truck and I can't seem to get the shop manager to do anything to remedy any of the issues with it so I try to figure out what is wrong with it and then either try to fix it myself or go to someone I know that will get it taken care of . Nothing was done to the truck previously before the issues, everything seems to just happen on its own.

ENGINE SA 16 ENGINE MODULE DTC P052712 VECU MID 144 PSID 40 FMI 4 ACM SA 17 ACM MODULE DTC P206C00 These are the codes i can pull up from the dash, only one of them pops up when the lightning bolt comes on along with the fan. I don't remember which code pops up with the lightning bolt and fan so I just put all 3 codes.

Would any of those cause the check engine light to stay on with a code ?

I drive a 2016 Mack Granite heavy haul with an mp8. What might cause the boost pressure to go to 36 psi for a short period and then drop to 28-29 psi with a noticeable loss in power? I can hear the turbo spool up when the boost goes up and the turbo slow down when I loose boost pressure? And what should the correct boost pressure go up to ? And I also have codes that I can't find anywhere online.