T870 DEF fault

[Kevman6]

Our 2016 T870 bobcat Ser# ASTW12057 has a SCR fault warning of U005435-12 (general pressure check fault) which also has triggered a tampering fault. I cannot find any reference as to where a pressure sensor is or check would take place. We recently had to replace the pretreatment temperature sensor which had failed. We also opened the DEF tank and drained it and added fresh DEF fluid. We also put in a new DEF tank cap and filler neck. After putting in the new temp sensor, it's code went away and so did the tampering code. Then shortly after, the new code for "General pressure check fault" came on, along with the tampering fault. Any help would be greatly appreciated. I find no info on where to check to resolve this problem.

 

[Kevman6]

The general pressure fault was cleared by tapping on the DEF pump a few times, All codes are gone, but I still have a Tampering fault and Derate of engine RPM. Only will Idle Not sure where to go from here to clear this fault as there is no other codes or faults to reference. Any knowledge out there will greatly be appreciated.

 

[foton]

The general pressure fault was cleared by tapping on the DEF pump a few times, All codes are gone, but I still have a Tampering fault and Derate of engine RPM. Only will Idle Not sure where to go from here to clear this fault as there is no other codes or faults to reference. Any knowledge out there will greatly be appreciated.

First I know nothing about that machine, but the tampering fault I assume is the machine is thinking that someone has tampered with the emmissions? (since you cleared the problem by tapping a stuck sensor in the def pump) I am gonna guess that if you disconnect the battery it would reboot an possibly work? hopefully not lose any programmed memory, maybe should call dealer and ask first and hear what they think.

 

[cmacd]

I don't know if I will be any help BUT I have been going all through our case tv380 and the scr module has a filter that collects particles from the exhaust clogand looks to me like when it gets clloged it throws scr codes. I don't know if the t870 is like that or not.