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P20EE Code - SCR NOx Catalyst Efficiency Below Threshold Bank 1

- Code Popularity: 75,799 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P20EE?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Exhaust Leaks
  • Fuel contamination
  • Faulty Diesel Particulate Filter (DPF)
  • Faulty NOx Sensor
  • Diesel Exhaust Fluid
  • Faulty Selective Catalyst Reduction (SCR) Catalyst
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How to Fix the DTC P20EE?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P20EE code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P20EE Description

The selective catalytic reduction system reduces oxides of nitrogen (NOx) emissions by injecting a metered amount of diesel exhaust fluid or reductant into the exhaust gas stream entering the Diesel Particulate Filter (DPF). Within the selective catalytic reduction catalyst, the reductant reacts with the NOx to form nitrogen, carbon dioxide, and water vapor. Upstream and downstream NOx sensors provide the Engine Control Module (ECM) with engine-out and tailpipe-out NOx levels.
The ECM uses the 2 NOx sensors to control exhaust NOx levels. The NOx sensor measures the amount of NOx and oxygen in the exhaust system. The first NOx sensor is located at the outlet of the turbocharger and monitors the engine out NOx. The second NOx sensor is in the DPF that monitors NOx levels exiting the DPF. The ECM varies the amount of reductant added by varying the reductant injector duty cycle in response to changes in engine exhaust out NOx levels.

OBDII Code P20EE - SCR NOx Catalyst Efficiency Below Threshold Bank 1 - AutoCodes.com
P20EE Code - SCR NOx Catalyst Efficiency Below Threshold Bank 1

Need More Information on the Code?

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Information for Specific Makes

  • P20EE Buick SCR NOx Catalyst Efficiency Below Threshold Bank 1
  • P20EE Cadillac SCR NOx Catalyst Efficiency Below Threshold Bank 1
  • P20EE Chevrolet SCR NOx Catalyst Efficiency Below Threshold Bank 1
  • P20EE Chrysler SCR NOx Catalyst Efficiency Below Threshold Bank 1
  • P20EE Dodge SCR NOx Catalyst Efficiency Below Threshold Bank 1  
  • P20EE Ford SCR NOx Catalyst Efficiency Below Threshold Bank 1
  • P20EE GMC SCR NOx Catalyst Efficiency Below Threshold Bank 1
  • P20EE Jeep SCR NOx Catalyst Efficiency Below Threshold Bank 1
  • P20EE Mercedes-Benz SCR NOx Catalyst Efficiency Below Threshold Bank 1
  • P20EE RAM SCR NOx Catalyst Efficiency Below Threshold Bank 1  

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