Code P20EE 5th Gen RAM

[Mdodge2]

My 2020 RAM 2500 got a check engine code P20EE (SCR Catalyst Efficiency Below Threshold).

The truck only has 8000 miles on it.

I haven't done any mods to motor yet, just a Bank Pedal Monster and OBD2 splitter for AMP steps.

I haven't noticed any difference in performance, just mileage drop.

Code popped up after I hooked up the OBD2 splitter and drove a few miles, but I don't think that will cause a code for emissions, right?

I cleared the code and unhooked the OB2 splitter.

Does anyone have any ideas?

I have DPF/EGR deletes and a few Banks parts just haven't been installed yet waiting on the tuner and tunes.

Thanks.

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[AK Bob]

I would take advantage of your warranty before any modifications.

Meanwhile, leave the splitter unhooked and out of the equation to see if the code reappears.

Unfortunately, this is a relatively new trouble code, so I don’t have any OEM information on it for you.

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[Mdodge2]

I would take advantage of your warranty before any modifications.

Meanwhile, leave the splitter unhooked and out of the equation to see if the code reappears.

Unfortunately, this is a relatively new trouble code, so I don’t have any OEM information on it for you.

It was not the splitter or Pedal Monster.

I cleared the code and left everything unplugged, and the code still popped up.

I will start with cleaning the Nox sensors and go from there.

Dodge service department where I live is garbage.

LOL, going to avoid them at all costs.

Thanks for the reply.

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[AK Bob]

It was not the splitter or Pedal Monster.

I cleared the code and left everything unplugged, and the code still popped up.

I will start with cleaning the Nox sensors and go from there.

Dodge service department where I live is garbage.

LOL, going to avoid them at all costs.

Thanks for the reply.

Hopefully, cleaning will help.

Please keep us posted.

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[Mdodge2]

Hopefully, cleaning will help.

Please keep us posted.

Welp cleaned both Nox sensors, checked all emissions wiring, flushed old DEF out of the system and put new DEF, inspected and cleaned DEF injector, and even took to the dealer today to flash PCM still has the code.

The truck goes into Regen just fine as well.

Next week, I go back to the dealer for my appt to run diagnostics.

Hopefully, my truck makes it through the 2000-mile round trip Im going on tomorrow, LOL.

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