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

Quick Answer

The P20EE code for Chrysler vehicles indicates an issue with the Selective Catalytic Reduction (SCR) system's NOx (Nitrogen Oxide) Catalyst efficiency, specifically on Bank 1. Common causes include Faulty NOx Sensor: A malfunctioning NOx sensor can provide inaccurate readings to the ECM, triggering the P20EE code, SCR Catalyst Damage: Damage to the SCR catalyst can hinder its ability to convert NOx gases efficiently, leading to this code, Exhaust Leaks: Leaks in the exhaust system before the SCR catalyst can introduce excess oxygen into the system, affecting NOx conversion. 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 Chrysler indicates SCR NOx Catalyst Efficiency Below Threshold Bank 1.
Common causes
Common causes include Faulty NOx Sensor: A malfunctioning NOx sensor can provide inaccurate readings to the ECM, triggering the P20EE code, SCR Catalyst Damage: Damage to the SCR catalyst can hinder its ability to convert NOx gases efficiently, leading to this code, Exhaust Leaks: Leaks in the exhaust system before the SCR catalyst can introduce excess oxygen into the system, affecting NOx conversion.
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 10, 2024
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Code P20EE Chrysler Description

The P20EE code for Chrysler vehicles indicates an issue with the Selective Catalytic Reduction (SCR) system's NOx (Nitrogen Oxide) Catalyst efficiency, specifically on Bank 1. The SCR system is a crucial component in reducing harmful emissions from the vehicle's exhaust gases, particularly NOx, a major contributor to air pollution. When the NOx Catalyst efficiency falls below the threshold set by the vehicle's Engine Control Module (ECM), it signifies that the system is not effectively converting NOx gases into less harmful nitrogen and oxygen.

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

Common Causes of P20EE Chrysler

  1. Faulty NOx Sensor: A malfunctioning NOx sensor can provide inaccurate readings to the ECM, triggering the P20EE code.
  2. SCR Catalyst Damage: Damage to the SCR catalyst can hinder its ability to convert NOx gases efficiently, leading to this code.
  3. Exhaust Leaks: Leaks in the exhaust system before the SCR catalyst can introduce excess oxygen into the system, affecting NOx conversion.
  4. DEF System Issues: Problems with the Diesel Exhaust Fluid system, such as low fluid levels or sensor malfunctions, can impact SCR system performance.

Symptoms of P20EE Chrysler

  1. Check Engine Light: The most common symptom associated with the P20EE code is the illumination of the Check Engine Light on the vehicle's dashboard.
  2. Reduced Fuel Efficiency: A malfunctioning SCR system can lead to decreased fuel efficiency as the engine may not be operating optimally.
  3. Failed Emissions Test: If the NOx emissions exceed legal limits, the vehicle may fail emissions testing, indicating a potential issue with the SCR system.
  4. Engine Performance Issues: The vehicle may experience reduced power, rough idling, or hesitation during acceleration due to the SCR system malfunction.
  5. Excessive Exhaust Smoke: An inefficient SCR system can result in increased exhaust smoke, indicating incomplete combustion of fuel.

How to Fix P20EE Chrysler

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the specific error codes and conduct tests to pinpoint the exact cause of the SCR NOx Catalyst efficiency below threshold issue.
  2. Inspect NOx Sensor: Check the NOx sensor for proper operation and replace it if necessary to ensure accurate readings.
  3. Test SCR Catalyst: Evaluate the SCR catalyst's condition and replace it if damaged or ineffective in converting NOx gases.
  4. Repair Exhaust Leaks: Identify and repair any leaks in the exhaust system before the SCR catalyst to prevent excess oxygen from impacting NOx conversion.
  5. Verify DEF System Function: Inspect the DEF system components, including fluid levels and sensors, to ensure proper operation and address any issues affecting SCR system performance.

Cost to Fix P20EE Chrysler

The cost of repairing a P20EE code for a Chrysler vehicle can vary depending on the specific cause of the issue and the parts and labor required for the repair. In general, replacing a faulty NOx sensor can cost between $200 and $400, while replacing the SCR catalyst can range from $500 to $1500 or more. Repairing exhaust leaks may cost around $100 to $300, depending on the extent of the damage. Overall, the total repair costs for addressing this code can range from $500 to $2000 or more, including parts and labor.

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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 Chrysler Code

1. What are common symptoms of OBDII code P20EE (Chrysler) SCR NOx Catalyst Efficiency Below Threshold Bank 1?

- Common symptoms include a check engine light illuminated on the dashboard, reduced engine performance, and potential issues passing emissions tests.

2. What are the possible causes of OBDII code P20EE (Chrysler) SCR NOx Catalyst Efficiency Below Threshold Bank 1?

- The code can be triggered by issues such as a faulty NOx sensor, a malfunctioning SCR catalyst, exhaust leaks, or contaminated DEF (diesel exhaust fluid).

3. How can I diagnose OBDII code P20EE (Chrysler) SCR NOx Catalyst Efficiency Below Threshold Bank 1?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, checking the NOx sensor readings, inspecting the SCR catalyst, and examining the DEF quality.

4. Can I drive my vehicle with OBDII code P20EE (Chrysler) SCR NOx Catalyst Efficiency Below Threshold Bank 1?

- It is not recommended to drive the vehicle for an extended period with this code as it may lead to reduced fuel efficiency, engine damage, or failure to meet emission standards.

5. How can I repair OBDII code P20EE (Chrysler) SCR NOx Catalyst Efficiency Below Threshold Bank 1?

- Repairs may involve replacing the NOx sensor, repairing exhaust leaks, cleaning or replacing the SCR catalyst, ensuring proper DEF quality, and clearing the code with an OBDII scanner.

6. Is it possible to reset OBDII code P20EE (Chrysler) SCR NOx Catalyst Efficiency Below Threshold Bank 1 without fixing the underlying issue?

- While you can clear the code temporarily with an OBDII scanner, it is crucial to address the root cause to prevent further damage and ensure the vehicle operates efficiently.

7. What are the long-term consequences of ignoring OBDII code P20EE (Chrysler) SCR NOx Catalyst Efficiency Below Threshold Bank 1?

- Ignoring the code can lead to increased emissions, potential damage to the engine or emission control components, and may result in the vehicle failing emission tests.

8. Are there any maintenance tips to prevent OBDII code P20EE (Chrysler) SCR NOx Catalyst Efficiency Below Threshold Bank 1?

- Regularly maintaining the exhaust system, using high-quality DEF, following the manufacturer's recommended service schedule, and addressing any warning lights promptly can help prevent this code.

9. Can weather conditions affect OBDII code P20EE (Chrysler) SCR NOx Catalyst Efficiency Below Threshold Bank 1?

- Extreme temperatures or adverse weather conditions can impact the performance of the SCR system and potentially trigger the code, so it's essential to monitor the system in varying conditions.

10. Is OBDII code P20EE (Chrysler) SCR NOx Catalyst Efficiency Below Threshold Bank 1 a common issue in certain Chrysler models?

- This code is more commonly reported in specific Chrysler models equipped with SCR systems, particularly in vehicles that have been driven for an extended period without proper maintenance.

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