DD13 SPN 3251fmi 21

[Therealarw]

(11-13-2025 )mikkhh Wrote:  Keep in mind that 99% of demans are complete garbage on those DD13. ..

Hey there man thank you for the reply, yeah we didn’t Deman it. Everything is still under the emissions and runs the proper def and temps so nothings been changed there. I would have to get the Detroit diagnostic link program in order to check those voltages and readings, it’s kinda hard to really point where the problem is, I’m not 100% sure where the module is on this truck it might be actually within the ecm but I’m not 100% sure on that either