cm871 regen problem

[rapidisimo]

2011 International prostar with cm871. So I recently did an EGR tuneup also cleaned my DOC and DPF and the truck is running great. My problem is when I try to do a forced regen with insite, the regen starts fine but about 5 mins in the engine starts to overheat (fan not coming on) and the regen is interrupted. The fault code is 2963-Engine Coolant Temperature — Data Valid but Above Normal Operational Range — Least Severe Level. I can't figure out why it's doing this, before doing the EGR tuneup it would regen just fine all the way thru. I'm thinking it's a faulty sensor somewhere but can't figure it out. Has anyone experienced this?

PS, the fan works under normal operation.

Thanks in advance!