P20EE Jeep Code - SCR NOx Catalyst Efficiency Below Threshold Bank 1
Quick Answer
The aftertreatment system is equipped with two Nox Sensors. Common causes include Faulty NOx Sensor, Diesel Exhaust Fluid, Faulty Selective Catalyst Reduction (SCR) Catalyst. 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 Jeep indicates SCR NOx Catalyst Efficiency Below Threshold Bank 1.
- Common causes
- Common causes include Faulty NOx Sensor, Diesel Exhaust Fluid, Faulty Selective Catalyst Reduction (SCR) Catalyst.
- 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.
Code P20EE Jeep Description
What are the Possible Causes of the DTC P20EE Jeep?
- Faulty NOx Sensor
- Diesel Exhaust Fluid
- Faulty Selective Catalyst Reduction (SCR) Catalyst
How to Fix the DTC P20EE Jeep?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P20EE Jeep code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P20EE Jeep Code
1. What are the common symptoms of OBDII code P20EE in a Jeep?
- Common symptoms include the check engine light illuminating, reduced engine performance, and potentially increased emissions.
2. What does the OBDII code P20EE indicate in a Jeep?
- The code indicates that the Selective Catalytic Reduction (SCR) system's NOx (nitrogen oxide) catalyst efficiency is below the threshold on Bank 1.
3. What are the possible causes of the SCR NOx Catalyst Efficiency Below Threshold Bank 1 code in a Jeep?
- Possible causes include a faulty NOx sensor, issues with the SCR system components, exhaust leaks, contaminated DEF (diesel exhaust fluid), or a malfunctioning catalytic converter.
4. How can I diagnose the OBDII code P20EE in my Jeep?
- Diagnosis typically involves using a scan tool to retrieve the code, inspecting the SCR system components for damage or leaks, testing the NOx sensor, and checking the DEF quality.
5. Can I continue driving my Jeep with the P20EE code present?
- It is not recommended to drive the vehicle with this code as it can lead to increased emissions and potential damage to the catalytic converter and other components.
6. How can I repair the SCR NOx Catalyst Efficiency Below Threshold Bank 1 code in my Jeep?
- Repair may involve replacing the NOx sensor, repairing any leaks in the exhaust system, ensuring proper DEF quality, or addressing issues with the SCR system components.
7. Is it possible to reset the OBDII code P20EE in a Jeep without fixing the underlying issue?
- While you can clear the code with a scan tool, it is crucial to address the root cause of the problem to prevent it from reoccurring and potentially causing more significant issues.
8. Can a DIY enthusiast fix the P20EE code in a Jeep, or is professional help necessary?
- Depending on the cause of the code, some repairs may be within reach of a DIY enthusiast with the right tools and knowledge. However, complex issues may require professional assistance.
9. How can I prevent the SCR NOx Catalyst Efficiency Below Threshold Bank 1 code from reappearing in my Jeep?
- Regular maintenance, using high-quality DEF, driving habits that promote efficient emissions control, and prompt addressing of any related issues can help prevent the code from coming back.
10. Are there any recalls or technical service bulletins related to the P20EE code in Jeeps?
- It is recommended to check with a Jeep dealership or online resources for any recalls or technical service bulletins related to the SCR NOx Catalyst Efficiency Below Threshold Bank 1 code in your specific Jeep model.
Discuss the causes and fixes for P20EE Jeep OBDII Code
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Engine check light came on within 30 mins of leaving Jeep main dealership after having the 66A recall fix software update. Code P20EE shows on scan. Fuel economy normal, no black smoke, engine performance normal. Dealer tech cleared code and said contact them again if the engine check light comes on again, probably just the new software settling in ??? Engine check light came on again about 10 days later, also noticed frequent 'Exhaust system regeneration in process' messages. Clear code again it comes back about 7-10 days later. Dealership wants to replace expensive sensor with no commitment that it will clear the fault permanently. I have checked the DEF injector for crystallisation but it was perfectly clean. Could the problem be the software update or not ???
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The timing of the problem is certainly suspicious. If the P20EE first appeared immediately after the 66A software update and keeps returning every 7-10 days, I would not completely rule out a software-related issue. However, "the software settling in" is not really how these systems work. Normally, if the update changed the SCR monitoring strategy, it may now be detecting a problem that was already present but not being flagged before.
Since fuel economy, performance, and smoke levels are normal, I would be cautious about replacing expensive parts without more testing. A faulty NOx sensor is a common cause of P20EE, but so are SCR catalyst efficiency issues, contaminated DEF, and even small exhaust leaks upstream of the sensors.
The repeated "Exhaust system regeneration in process" messages are interesting because they suggest the emissions system is working harder than normal. Before authorizing a catalyst replacement, I would want to see live NOx sensor data, DEF quality test results, and confirmation that the vehicle has the latest calibration available. If the code only started after the recall update, I would also ask the dealer whether there are any technical service bulletins or software revisions related to P20EE following the 66A update.
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