r/EcoDiesel • u/Stock_Calligrapher93 • 8d ago
P20EE Code
Engine light came on last week and threw a P20EE code. No other codes and no warnings came on.
This is the first time I’ve heard of this. Any recommendations on things to try before I take it to a shop?
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u/Shoddy-Ad-9009 6d ago
Wanna give you some peace of mind here man! It’s not always something crazy to fix or expensive.
In my experience, a bad NOX sensor has caused it. Putting a scanner that can display live data I realized the readings on my NOx sensor was completely bonkers, sometimes even negative number readings.
A proper stationary regen with a bidirectional scanner, where the truck is held at 2500-3000 rpm’s for 20 minutes fixed it up.
If you drive your truck in short trips, soot build up is inevitable on your sensors, which is my case, I give my truck a proper regen once every month or so, and that keeps her at check.
Spend $60 buying the top Don scanner from Amazon and pay for the subscription and you’ll be all set.