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Severity: ModerateRam

P20EE on Ram Vehicles

The SCR catalyst isn't removing enough NOx; DEF quality, dosing, a NOx sensor or the catalyst is at fault. P20EE →

6Complaints mentioning the code
#1Rank among 4 brands
1.0%Share of Ram DTC complaints

In NHTSA owner complaints we analyzed for Ram, P20EE was mentioned 6 times.

Notes by brand

On Ram trucks with the 6.7L Cummins, NOx sensors are a frequent replacement item and a drifting sensor commonly sets P20EE together with a NOx sensor code, so compare both sensors before replacing the catalyst.

Most mentioned models

Ram 15005
Ram 55001

Model years mentioned

Model years mentioned – Ram P20EE113114115216117
2013: 1 · 2014: 1 · 2015: 1 · 2016: 2 · 2017: 1

Components named in these complaints

  • Engine And Engine Cooling (2)
  • Power Train (2)
  • Engine (2)
  • Unknown Or Other (1)
  • Fuel System (1)

Often appears together with

P0402 Powertrain More exhaust is being recirculated than the ECU asked for, usually because the EGR valve won't… Moderate

Possible causes

  1. Poor DEF quality: diluted with water, contaminated or degraded by heat and age25%
  2. DEF dosing injector partly clogged by urea crystals or sticking20%
  3. NOx sensor 1 or sensor 2 drifting, so the calculated efficiency is wrong20%
  4. Low DEF delivery: weak pump, clogged pump filter, leaking line or frozen line with a failed heater12%

P20EE: Diagnosis step by step →

Related codes

RamEmission ControlsCheck engine light onLimp modeCar won't startLoss of power

Source: NHTSA Complaints API (US government open data), analyzed by DTC mention.