P20EE OBD Error Code: Problem & Solutions

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The prime symptom of the OBD code P20EE is the increased emissions in the exhaust system. This not only increases pollutant emissions, but will also hamper the performance of the vehicle with affected utilization of the fuel delivery system. If the SCR injection system performance is out of bounds, OBD code P20EE gets stored in the PCM.

OBD code P20EE means SCR NOx Catalyst Efficiency Below Threshold Bank 1 Issue.

SCR technology is one of the most cost-effective and fuel-efficient technologies available to help reduce diesel engine emissions. All heavy-duty diesel truck engines produced after January 1, 2010 must meet the latest EPA emissions standards, among the most stringent in the world, reducing particulate matter (PM) and nitrogen oxides (NOx) to near zero levels. SCR can reduce NOx emissions up to 90 percent while simultaneously reducing HC and CO emissions by 50-90 percent, and PM emissions by 30-50 percent. SCR systems can also be combined with a diesel particulate filter to achieve even greater emission reductions for PM. In the commercial trucking industry, some SCR-equipped truck operators are reporting fuel economy gains of 3-5 percent. Additionally, off-road equipment, including construction and agricultural equipment, must meet EPA's Tier 4 emissions standards requiring similar reductions in NOx, PM and other pollutants.

What causes this problem with the SCR NOx Catalyst Efficiency Below Threshold Bank 1?

• Leaks in the exhaust system
• Contaminated fuel
• Failed Diesel Particulate Filter (DPF)
• NOx Sensor problem
• Wrong Diesel Exhaust Fluid
• Failed Selective Catalyst Reduction (SCR) Catalyst

1. Engine Control Module – Most of the time it is difficult to intercept the ECM faults and thus must be checked for thoroughly. There can be a problem with the circuit or the software might have malfunctioned. Thus repair, replace or reprogram the component as per requirement.
2. Powertrain Control Module – If the PCM is faulty, it can stores wrong OBD codes and can lead to misdiagnosis. This can happen due to misinterpretation of data received from the various sensors and components which also affects the vehicle’s performance. Thus replace it immediately.
3. Diagnostic Tools – Use factory grade diagnostic tools to resolve OBD code P20EE error. Buy new diagnostic tools and equipment for us.
4. Diesel Particulate Filter – The diesel particulate filter acts as an important component in managing the particulate emission in the exhaust system. If the filter is damaged, it may lead to increased emissions and pollutants through the tailpipe. Thus, replace damaged filter now!
5. Diesel Exhaust Fluid Heater – If the diesel exhaust fluid heater is faulty, it will not be able to aid in conversion of harmful nitrous oxide compounds to nitrogen, carbon dioxide and water vapours to control emissions. Thus, replace it immediately.
6. Exhaust System - Your exhaust system begins at the engine with the purpose of removing toxic gases and fumes from your vehicle. The components are a series of pipes, catalytic converters, sensors, mufflers, and often a resonator, as well as other emission devices. Thus, replace damaged exhaust system now!

Have you ever wondered why is it so important to know the symptoms of the problem? Well, it is extremely essential to know the symptoms of the problem in order to detect it. Keeping this in mind, let’s throw some light on few common symptoms of OBD error code P20EE.

Common Symptoms

• Reduction in fuel efficiency
• Excessive black smoke from vehicle exhaust
• Diminished engine performance
• Other SCR related codes

It is very important to fix the fault code P20EE. So here are some ways with which you can correct this issue:

• Diesel Exhaust Fluid Heater replacement
• Diesel Particulate Filter replacement
• Exhaust System replacement
• Faulty Reductant Injection valve replacement
• Faulty wiring and connector issue
• PCM repair and reprogramming

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P20EE code to be stored:

• Hook up a scan tool to the DLC port
  
• and check for any codes present.
• Note the codes and freeze frame data from all the codes.
• Clear the stored codes from the ECU.
• Perform a road test under similar conditions as the freeze frame data indicated.
• Check that the P20EE is the code that has come back after the test drive.
• A visual inspection will be done looking for signs of exhaust leaks or damaged wiring for either the sensor itself of the harness.
• Using a multimeter, the OHMs will be checked to the exhaust gas temperature sensor.
• The vehicle will be ran and the presence of exhaust leaks will be checked.

Common Mistakes When Diagnosing the P20EE Code

• Faulty Powertrain Control Module (PCM)
• Failed SCR controller
• Failed Reductant control system
• Wiring harness and connector issue