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P20EE Code Duramax- Let’s Fix With Our Experts Guide!

Worrying about p20ee code duramax and don’t even know what it is? It is a diagnostic trouble code that may appear or log in to the OBD system. The fault code stands for SRC NOx Catalyst Efficiency Below Threshold.

The OBD (on-board diagnostic) systems help the vehicle owners and technicians to figure out any typical issues in a vehicle. But before you figure out the problem and solve it, you need to know what this error code indicates.

This article will elaborate on some basic information and knowledge about this selective error code of Duramax engines. So let’s see.

P20EE Code Duramax

The P20EE means SRC NOx Catalyst Efficiency Below Threshold. Here the SRC denotes selective catalytic reduction catalyst on a Duramax diesel engine. And NOx stands for nitrogen oxides.

So when PCM detects catalyst efficiency is below the threshold on bank 1, the p20ee code Duramax 2021 appears. The diesel exhaust fluid is input into the SCR catalyst to conduct the chemical reaction.

The DEF (diesel exhaust fuel) converts the harmful NOx into N2, CO2, and water.

However, the p20ee code gmcDuramax is a DTC (diagnostic trouble code) that applies to the GMC OBD-II vehicle. This fault code may also appear in other OBD-II cars like Toyota, Audi, Ford, Chevrolet, Volkswagen, etc.

Here’s a table made with all the possible and potential causes of p20ee code Duramax l5p. You will also notice the symptoms given in the table below if your vehicle has the P20EE trouble code.

CausesSymptoms
SCR failureExhaust system warning
Faulty wires and connectionsExhausting excessive black smoke
Damaged circuitPoor engine performance
Contamination of DEFThe fuel efficiency reduction
Defective exhaust gas or temperature sensorActive check engine light
DEF injector failure.
Control module issue
No DPF regeneration

However, if you are looking for fixing P20ee Code Duramax Lml, this guide can help too.

SCR Failure

The SCR system has failed if all the circuits and sensors are functioning correctly, but still, the P20EE code appears. Repair the exhaust emission leaks before diagnosing the p20ee code duramax 2017.

Faulty Wires And Connections

Visually inspect the damaged cables and connectors and fuse first. If you find any defective connection, and fuse repair them or replace it with a new one. It would be best to fix the Burnt or broken cables before the diagnostic process.

Faulty Exhaust Gas Or Temperature Sensor

A defective O2, NOx, or exhaust gas temperature sensor may negatively affect a vehicle’s after treatment. It needs to be replaced if t gets damaged.

Also Read: P1093 Duramax Error Code And Their Solutions

If the error code still appears after installing a new NOx sensor, take your vehicle to a repair shop for investigation.

Contamination Of The DEF

Check if the diesel engine fluid reservoir is filled with proper fluid. And if the Def is contaminated, replace the fuel filters the injectors. You might also need to check the high-pressure fuel pump to replace it.

Control Module Issue

If there is any control module issue behind the p20ee code duramax 2020, you must replace it. The control modules are not designed to be fixed or repaired by typical car owners. The software might also need to be reprogrammed.

This Video Will Help You Too!

Frequently Asked Questions (FAQs)

How to fix the p20ee code?

To fix the P20EE trouble code, you need to follow the appropriate diagnostic process. Check all the possible causes and visually inspect the connectors, wires, and damaged components. Then repair or replace the damaged and faulty parts.

What is a P20EE dodge code?

A P20EE dodge code is a diagnostic trouble code. It suggests that the SRC NOx Catalyst Efficiency is Below the Threshold. Here the SRC denotes selective catalytic reduction catalyst on a Duramax diesel engine.

What does the P20EE code mean?

The P20EE code means SRC NOx Catalyst Efficiency Below Threshold. Here the SRC denotes selective catalytic reduction catalyst on a Duramax diesel engine. And NOx stands for nitrogen oxides. So when PCM detects catalyst efficiency is below the threshold on bank 1, the P20EE trouble code appears.

Can I drive with a P20EE code?

Yes, you can drive with a p20ee code on your vehicle. You can disconnect your car’s battery to clear the fault code. But it is suggested to get it fixed as soon as possible.

Final Verdict

Hope you have got some idea about the p20ee code duramax engine. Seek the main source of the problem when you notice any of the symptoms in your vehicle. If you can not afford automotive by yourself, call a professional mechanic or technician.

There are different solutions for different causes. So be careful about the diagnosis. The mechanic should follow the diagnosis procedure appropriately. 

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D Conroy

Meet our senior writer and content manager of Automasterx. He has worked in several mechanical garages and mastered different vehicle diagnoses and parts repair. He never stops until finding out the ultimate solutions for any vehicle fault code. However, ensuring the only solid solutions for each vehicle malfunction is his core part of the duty, alongside analyzing fault codes and signals.

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