Diesel Man 1 Posted December 9, 2020 Share Posted December 9, 2020 Hey guys I am just wondering if you guys have any Self made Diagnostics that you use like a check lit for the dreaded P20EE00 code I have replaced two SCR'S via E-service under warranty I have had this code a few times on trucks that are not under warranty and I have replaced the dosing valves the flex pipe between SCR and DPF and NOx sensor very once in a wile and to a Sublimation regen, but I feel I need a better check list then what CBR provides Thanks for the help in advance. ps were a small dealership and not very many guys here that have several years of experience Quote Link to post Share on other sites
41chevy 10,259 Posted December 9, 2020 Share Posted December 9, 2020 P20EE general causes, Exhaust Leaks, Fuel contamination, Faulty Diesel Particulate Filter (DPF),Faulty NOx Sensor, contaminated DEF or Faulty SCR Catalyst. Since you have done most of that at one time or another, I would start by visually inspecting the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins. Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to post Share on other sites
Mackpro 417 Posted December 10, 2020 Share Posted December 10, 2020 I think in the last CBR bulletin I saw, it wanted you to look at the past history of the truck , like a failed turbo or EGR cooler . 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 Quote Link to post Share on other sites
fjh 748 Posted December 10, 2020 Share Posted December 10, 2020 ( Faulty SCR Catalyst.) this is a possibility Its been quite spotty and we have replaced several ! How ever you got the follow the the rules of engagement Or warranty won't pay if you have any left! 1 Quote Link to post Share on other sites
Dirtymilkman 1,247 Posted December 11, 2020 Share Posted December 11, 2020 I had to change out the scr on mine to clear that code. The dealer went down the list and replaced everything before finally doing the scr. It went a little over 10,000 hours before it did it again. Now its fixed permanently. Quote Link to post Share on other sites
Mackpro 417 Posted December 11, 2020 Share Posted December 11, 2020 A bunch of bulletins released today on CBR , CBR-2076-1 talks about new software for the P20EE code . Unknown how long the software has been out but it’s worth a try . Quote Link to post Share on other sites
Diesel Man 1 Posted December 11, 2020 Author Share Posted December 11, 2020 Thanks Mackpro I will check it out! Quote Link to post Share on other sites
Diesel Man 1 Posted December 11, 2020 Author Share Posted December 11, 2020 thanks guys for all the help I will see what I can find! Quote Link to post Share on other sites
Diesel Man 1 Posted January 21 Author Share Posted January 21 so I have been finding exhaust flex pipes that have been broken near NOx sensors and that has been causing them to read incorrectly. also there has been a lot of crystallizations build up on the flex pipe between the DPF and the SCR I have found two lower DPF housings that are cracked next to the Def injectors (it is a hair line crack) (also have been told that it can crack on the flange for the Exhaust flex but have to heat them up to see cracks) but that cause fresh air to get in to the dpf and scr and causes crystallization build up witch interrupts the exhaust flow and causes the P20EE code hope this helps others. Quote Link to post Share on other sites
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