Mar 30, 2016 · Hello fella's I just bought a 2014 2500 with a 6.7 and 26400 miles on it . Driving the other night it kicked the p20ee code out. I took it to the dealership and they called me today and said they …

Nov 23, 2020 · Hello! I am new to this page. A couple weeks ago I had the P20EE code pop up. I added fresh DEF to the tank and cleared the code. About 5 miles later the check engine light came back on …

Dec 28, 2016 · P20ee - SCR Oxides Of Nitrogen Catalyst Efficiency Below Threshold (Bank 1) This is exactly the same message I got 2 years ago (at 49,960 miles). At that time both pre and post cat …

Jan 4, 2026 · 2018 Silverado 2500 Diesel w 101000 miles - When my issue started I had code P20EE and P11C5. I replaced both NOx sensors and cleaned a huge build up on the MAP sensor. Did a …

Sep 15, 2016 · The P249E code came back, but not the P20EE code, drove it like crazy to see if I could get both of the codes again but only the P249E. I researched the conditions and checked out the …

Sep 4, 2017 · P20EE doesn't have anything to do with DEF quality, simply a indication of the cat efficiency. Mine, last week, had the P20EE pop again, along with a P229F, which is the code for the …

May 28, 2020 · Last friday night I got the Check engine light with the P20EE code. got the truck in on Sat and the shop diagnosed it as contaminated DEF. The result was a new CAT which was only 3.5 yrs …

Apr 3, 2016 · Add me to the LML defect list - p11dc, p20ee, p2bad, bad def fluid LML: Jump to Latest 12K views 12 replies 7 participants last post by jd4230 Apr 10, 2016

May 21, 2025 · Just threw a check engine light for code P20EE. Autozone report says replace cat, lol seems like a heck of a 1st jump for the possible fix. Put in a jug of Auto Zone(shop pro) DEF then …

Mar 1, 2020 · P20EE is NOx catalyst efficiency below threshold. This code was one of the indicators of a SCR cat going south, and why RAM issued a recall for replacing them, has this recall been done to …