2017 hino p204f

jpmover76

New Recruit
Low power , def light flashing , put new 5th injector , have aftermarket scan tool.that i bought to force regen , does not work .
Turn key to on position , regen button on dash lights up and i can hear pump in def tank come on , once start truck , nothing works , not def regen , scanner will not force regen . Truck only has 117k miles , never had this problem , is there a way tk reset ecm/ scr controller ? Thanks
 

greasytshirt

Moderator
Staff member
Mechanic
P204F is not related to a regen problem. That suggests a problem with DEF/SCR. The scanner must be able to talk to the DCU to have any chance of fixing it.
 

HinoRich

Active Expediter
Owner/Operator
I have the same code P204F and CEL but my truck runs fine. It started doing it one week, then went out the next week and has come on again but the truck continues to run fine.Could this be a bad sensor or bad DEF? I mean for the P204F.
 
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