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P20EE RAM Code - SCR NOx Catalyst Efficiency Below Threshold Bank 1

Quick Answer

The diagnostic trouble code P20EE for RAM vehicles indicates that the Selective Catalytic Reduction (SCR) NOx Catalyst efficiency is below the threshold on bank 1. Common causes include Faulty NOx sensor: A malfunctioning NOx sensor may provide incorrect data to the SCR system, leading to efficiency issues, Contaminated AdBlue fluid: If the AdBlue fluid is contaminated or diluted, it can impact the effectiveness of the SCR catalyst, Exhaust leaks: Any leaks in the exhaust system can affect the performance of the SCR system. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P20EE RAM indicates SCR NOx Catalyst Efficiency Below Threshold Bank 1.
Common causes
Common causes include Faulty NOx sensor: A malfunctioning NOx sensor may provide incorrect data to the SCR system, leading to efficiency issues, Contaminated AdBlue fluid: If the AdBlue fluid is contaminated or diluted, it can impact the effectiveness of the SCR catalyst, Exhaust leaks: Any leaks in the exhaust system can affect the performance of the SCR system.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P20EE RAM Description

The diagnostic trouble code P20EE for RAM vehicles indicates that the Selective Catalytic Reduction (SCR) NOx Catalyst efficiency is below the threshold on bank 1. This means that the system responsible for reducing harmful nitrogen oxide emissions is not operating at its optimal level. The SCR system uses a urea-based solution (AdBlue) to convert nitrogen oxides into harmless nitrogen and water vapor. When the efficiency of the catalyst is below the threshold, it can lead to increased emissions and potentially cause the vehicle to fail emissions tests. This issue can also impact fuel economy and overall engine performance.

OBDII Code P20EE RAM - SCR NOx Catalyst Efficiency Below Threshold Bank 1
P20EE RAM Code - SCR NOx Catalyst Efficiency Below Threshold Bank 1

Common Causes of P20EE RAM

  1. Faulty NOx sensor: A malfunctioning NOx sensor may provide incorrect data to the SCR system, leading to efficiency issues.
  2. Contaminated AdBlue fluid: If the AdBlue fluid is contaminated or diluted, it can impact the effectiveness of the SCR catalyst.
  3. Exhaust leaks: Any leaks in the exhaust system can affect the performance of the SCR system.
  4. Wiring issues: Poor electrical connections or damaged wiring can disrupt communication between components of the SCR system.

Symptoms of P20EE RAM

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Engine Performance: The vehicle may experience decreased power, acceleration, and overall performance.
  3. Increased Emissions: The vehicle may produce higher levels of nitrogen oxides and fail emissions tests.
  4. Poor Fuel Economy: A decrease in fuel efficiency may be noticed as a result of the SCR system not functioning efficiently.

How to Fix P20EE RAM

  1. Diagnose the issue: Use a diagnostic scanner to retrieve the specific fault codes and pinpoint the root cause of the problem.
  2. Inspect the NOx sensor: Check the NOx sensor for proper operation and replace it if necessary.
  3. Test the AdBlue fluid: Verify the quality and concentration of the AdBlue fluid and refill or replace as needed.
  4. Check for exhaust leaks: Inspect the exhaust system for leaks and repair any damaged components.
  5. Repair wiring: Inspect the wiring harness for any damage or corrosion, and repair or replace as necessary.

Cost to Fix P20EE RAM

The cost of repairing the SCR NOx Catalyst efficiency below threshold issue can vary depending on the specific cause of the problem and the labor rates in your area. On average, the repair costs can range from $200 to $800, which includes parts and labor. However, it's important to note that the final cost may be higher if additional components need replacement or if the repair requires more extensive labor. It's recommended to consult with a professional mechanic to get an accurate estimate tailored to your vehicle's make and model.

What does this mean?

Tech Notes for P20EE RAM

For the 2011-2012 Ram 3500, 4500, and 5500 there is a factory service bulletin that recommends replacing the Selective Catalyst Reduction (SCR) Catalyst assembly if exhaust fluid leaks are found or there are no signs of DEF fluid contamination found









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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P20EE RAM Code

What does the OBDII code P20EE mean?

The OBDII code P20EE indicates that the SCR (Selective Catalytic Reduction) NOx (Nitrogen Oxide) catalyst efficiency is below the acceptable threshold for Bank 1, suggesting that the catalyst may not be functioning properly.

What are the common symptoms associated with the P20EE code?

Common symptoms include increased emissions, reduced engine performance, a decrease in fuel efficiency, and the check engine light being illuminated on the dashboard.

What can cause the P20EE code to trigger?

The P20EE code can be triggered by a faulty NOx sensor, a malfunctioning SCR catalyst, clogged exhaust components, or issues with the DEF (Diesel Exhaust Fluid) system.

Can I drive my vehicle with the P20EE code?

While you can technically drive with the P20EE code, it is not advisable, as it can lead to increased emissions and potential damage to the exhaust system. It's best to have it diagnosed and repaired promptly.

How can I diagnose the P20EE code?

To diagnose the P20EE code, use an OBD-II scanner to read the trouble codes, inspect the SCR system, check the NOx sensors, and look for any leaks or blockages in the exhaust system.

What repairs are typically needed for the P20EE code?

Repairs may include replacing the NOx sensor, cleaning or replacing the SCR catalyst, fixing any leaks in the exhaust system, or addressing issues with the DEF system.

Is it expensive to fix the P20EE code?

The cost to fix the P20EE code can vary widely depending on the specific issue, but repairs involving the SCR system or catalyst can be costly, often ranging from a few hundred to several thousand dollars.

Can I reset the check engine light after fixing the P20EE code?

Yes, after addressing the underlying issue causing the P20EE code, you can reset the check engine light using an OBD-II scanner. It's recommended to clear the codes and perform a test drive to ensure the issue is resolved.

Will ignoring the P20EE code lead to further problems?

Yes, ignoring the P20EE code can lead to more severe engine issues, increased emissions fines, and potential damage to the SCR system, which may result in more expensive repairs down the line.

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