Why does the upside down triangle light continues to stay on even after you do a Regen on a 2009 international prostar?

Answer 1

You really need to get the software hooked up and pull fault codes. Too heavy of a soot load in the DPF to allow for a complete regeneration could be a possibility. Inadequate temperatures reached for a successful regeneration could be another. If you have the Cummins ISX, this could be caused by too much or too little fuel being put into it by the dosing injector. Inadequate air flow to achieve the ideal fuel/air mixture because of blockage of the air intake (such as a plugged air filter), and insufficient temperatures reached during the regen for it to be successful (which could be caused by blockage due to excessive ash, cracking in the DOC, DPF, or outlet, etc.) are other possible reasons. Admittedly, I'm not the most familiar with the ProStar, and even less so with the MaxxForce engines, so it is possible that the DTC (Data Trouble Code) might not even be an aftertreatment system issue, although I do believe International uses a generic amber engine light for non-emissions DTCs.