P20EE Chevrolet Code - SCR NOx Catalyst Efficiency Below Threshold Bank 1
Quick Answer
The selective catalytic reduction system reduces oxides of nitrogen (NOx) emissions by injecting a metered amount of diesel exhaust fluid or reductant into the exhaust gas stream entering the Diesel Particulate Filter (DPF). Common causes include Exhaust Leaks, Fuel contamination, Faulty Diesel Particulate Filter (DPF). 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 Chevrolet indicates SCR NOx Catalyst Efficiency Below Threshold Bank 1.
- Common causes
- Common causes include Exhaust Leaks, Fuel contamination, Faulty Diesel Particulate Filter (DPF).
- 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 Chevrolet Description
The ECM uses the 2 NOx sensors to control exhaust NOx levels. The NOx sensor measures the amount of NOx and oxygen in the exhaust system. The first NOx sensor is located at the outlet of the turbocharger and monitors the engine out NOx. The second NOx sensor is located in the DPF that monitors NOx levels exiting the DPF. The ECM varies the amount of reductant added by varying the reductant injector duty cycle in response to changes in engine exhaust out NOx levels.
What are the Possible Causes of the DTC P20EE Chevrolet?
- Exhaust Leaks
- Fuel contamination
- Faulty Diesel Particulate Filter (DPF)
- Faulty NOx Sensor
- Diesel Exhaust Fluid
- Faulty Selective Catalyst Reduction (SCR) Catalyst
How to Fix the DTC P20EE Chevrolet?
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.
Code Tech Notes
2010 Chevrolet Express
2011 Chevrolet Express
2011 Chevrolet Silverado
Chevrolet Factory Service Bulletin OBDII Code P20EE
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P20EE Chevrolet 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.
Need more information about the P20EE Chevrolet code?
Need more information on how to fix the P20EE Chevrolet code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P20EE Chevrolet code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P20EE Chevrolet Code
1. What are the common symptoms of OBDII code P20EE in a Chevrolet, indicating SCR NOx Catalyst Efficiency Below Threshold Bank 1?
- Common symptoms include poor engine performance, reduced fuel efficiency, and potential illumination of the Check Engine Light.
2. What are the possible causes of the P20EE code in a Chevrolet, indicating SCR NOx Catalyst Efficiency Below Threshold Bank 1?
- Causes may include a faulty NOx sensor, issues with the selective catalytic reduction (SCR) system, exhaust leaks, or contaminated DEF (diesel exhaust fluid).
3. How serious is the P20EE OBDII code in a Chevrolet, indicating SCR NOx Catalyst Efficiency Below Threshold Bank 1?
- This code should be addressed promptly as it can lead to increased emissions, potential harm to the environment, and could cause the vehicle to fail emissions testing.
4. Can I continue driving my Chevrolet with the P20EE code indicating SCR NOx Catalyst Efficiency Below Threshold Bank 1?
- It is not recommended to drive the vehicle for an extended period with this code present, as it can lead to further damage and decreased performance.
5. How can I repair the P20EE code in my Chevrolet, indicating SCR NOx Catalyst Efficiency Below Threshold Bank 1?
- Repair options may include replacing the NOx sensor, checking and repairing any exhaust leaks, ensuring DEF is not contaminated, and diagnosing and repairing any issues with the SCR system.
6. Will resetting the Check Engine Light on my Chevrolet clear the P20EE code indicating SCR NOx Catalyst Efficiency Below Threshold Bank 1?
- Resetting the Check Engine Light may temporarily turn it off, but the underlying issue causing the P20EE code will need to be addressed to prevent it from returning.
7. Can a DIY enthusiast diagnose and repair the P20EE code in a Chevrolet, indicating SCR NOx Catalyst Efficiency Below Threshold Bank 1?
- While some aspects of diagnosing and repairing this code can be done by a knowledgeable DIY enthusiast, it is recommended to seek professional help for a comprehensive diagnosis and repair.
8. How much does it typically cost to repair the P20EE code indicating SCR NOx Catalyst Efficiency Below Threshold Bank 1 in a Chevrolet?
- Repair costs can vary depending on the underlying issue, but they can range from a few hundred to over a thousand dollars, especially if components like the NOx sensor or SCR system need replacement.
9. How long does it take to repair the P20EE code indicating SCR NOx Catalyst Efficiency Below Threshold Bank 1 in a Chevrolet?
- The repair time can vary based on the specific issue causing the code, but it may take a few hours to a full day for diagnostics and repairs to be completed by a professional technician.
10. Are there any preventative maintenance steps I can take to avoid the P20EE code indicating SCR NOx Catalyst Efficiency Below Threshold Bank 1 in my Chevrolet?
- Regularly servicing the SCR system, using high-quality DEF, and promptly addressing any warning lights or unusual symptoms can help prevent the occurrence of this code.
Discuss the causes and fixes for P20EE Chevrolet OBDII Code
Code P20EE Chevrolet comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
