P20EE on Jeep
SCR NOx Catalyst Efficiency Below Threshold
P20EE on Jeep vehicles indicates scr nox catalyst efficiency below threshold. Au7o has documented this code across 1 Jeep model — most commonly on Grand Cherokee. This is a diesel emissions code meaning the Selective Catalytic Reduction (SCR) catalyst on Bank 1 is not cleaning up exhaust as well as it should. The SCR system sprays Diesel Exhaust Fluid (DEF) into the hot exhaust to convert harmful nitrogen oxides (NOx) into harmless nitrogen and water; NOx sensors before and after the catalyst tell the computer how well it is working. When the measured efficiency falls below the required threshold, this code sets. Because it is an emissions-protection code, it often triggers warning lights and can lead to reduced power or a speed limit (a 'derate') if left unfixed. Typical repair costs on Jeep range from $900 to $2,500, depending on the specific model and root cause.
Common Causes of P20EE
- •Poor quality, contaminated, or wrong DEF fluid
- •Faulty or clogged DEF injector/dosing valve
- •Failed upstream or downstream NOx sensor
- •Degraded or failed SCR catalyst
- •Exhaust gas temperature sensor fault affecting dosing
- •Exhaust or DEF line leak
- •DEF line/heater problems (crystallization or freezing)
P20EE on Jeep by Model
Jeep Grand Cherokee(1 issue)
- 3.0L EcoDiesel DEF Tank/Heater/Pump Failure Triggering Limp Mode and No-Start Countdown2014-2016
The diesel-exhaust-fluid (DEF/reductant) system on the 3.0L EcoDiesel Grand Cherokee is a frequent failure point. The integrated DEF tank assembly bundles the pump, heater, and level/temperature/pressure sensors into one unit; when any single internal component fails (commonly the pump pressure or the tank heater), it sets emissions codes. Because Mopar does not sell the internal components separately, a single failure requires replacing the entire tank assembly. Critically, an unresolved DEF fault escalates to a speed-limited limp mode and ultimately a no-start once the dashboard mileage countdown expires, stranding the vehicle.
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View P20EE across all makes →Frequently Asked Questions
What does P20EE mean on Jeep?▼
P20EE stands for "SCR NOx Catalyst Efficiency Below Threshold." This is a diesel emissions code meaning the Selective Catalytic Reduction (SCR) catalyst on Bank 1 is not cleaning up exhaust as well as it should. The SCR system sprays Diesel Exhaust Fluid (DEF) into the hot exhaust to convert harmful nitrogen oxides (NOx) into harmless nitrogen and water; NOx sensors before and after the catalyst tell the computer how well it is working. When the measured efficiency falls below the required threshold, this code sets. Because it is an emissions-protection code, it often triggers warning lights and can lead to reduced power or a speed limit (a 'derate') if left unfixed. On Jeep specifically, this code is documented across 1 model.
What causes P20EE on Jeep vehicles?▼
Common causes on Jeep: Poor quality, contaminated, or wrong DEF fluid, Faulty or clogged DEF injector/dosing valve, Failed upstream or downstream NOx sensor, Degraded or failed SCR catalyst, Exhaust gas temperature sensor fault affecting dosing. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P20EE on a Jeep?▼
Repair costs on Jeep range from $900 to $2,500, depending on the specific model and root cause.
Which Jeep models have P20EE documented?▼
Au7o has documented P20EE on 1 Jeep model: Grand Cherokee.