We have a 2012 Mack and it is showing an alert. The display on the truck reads: SCR system fault, engine will derate soon.. SCR system fault, engine will derate soon. What does this mean and what can we do to correct it? Answered by Clayton in 39 mins 12 years ago. Clayton. 5+ Years at Freightliner, Detroit & MBE Certified, ATD, and.. SCR fault Facebook; Twitter; SCR fault. By CCM December 27, 2016 in Engine and Transmission. Share. I'm an independent shop and new to the forum. I need some tech support on a 2012 Mack MRU613 MP7 non catalyzed system. Active codes SPN 5246/FMI 0, SPN 4094/FMI 18 keep returning. I have ran the DEF nozzle pressure test,flow test and measured.
The Selective Catalytic Reduction (SCR) technology plays an important role in lowering emissions in diesel vehicles, contributing to a cleaner and more sustainable environment. However, the SCR system, like any complex system, can develop faults that require quick attention. In this article, I will discuss the meaning of an SCR system fault on your Truck, […]. Where oil or coolant could have made it to the DPF or SCR box. This could " poison" the SCR box. Software updates help sometimes . We have been lucky and have not had to replace any SCR boxes on our 30 CXU/Anthems yet . We did have a cracked DPF filter causing a P20EE code once , see if the exhaust stack black or clean