P20EE GMC Code - SCR NOx Catalyst Efficiency Below Threshold Bank 1
Quick Answer
The P20EE GMC code indicates that the Selective Catalytic Reduction (SCR) system's NOx (nitrogen oxide) catalyst efficiency has fallen below the threshold for Bank 1. Common causes include Contaminated DEF: Contaminants in the diesel exhaust fluid can cause the SCR catalyst to become less effective, DEF Quality: The use of low-quality or incorrect DEF can lead to catalyst degradation, Exhaust System Leaks: Leaks in the exhaust system can allow DEF to escape before reaching the catalyst, reducing its efficiency. 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 GMC indicates SCR NOx Catalyst Efficiency Below Threshold Bank 1.
- Common causes
- Common causes include Contaminated DEF: Contaminants in the diesel exhaust fluid can cause the SCR catalyst to become less effective, DEF Quality: The use of low-quality or incorrect DEF can lead to catalyst degradation, Exhaust System Leaks: Leaks in the exhaust system can allow DEF to escape before reaching the catalyst, reducing its efficiency.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P20EE GMC Description
The P20EE GMC code indicates that the Selective Catalytic Reduction (SCR) system's NOx (nitrogen oxide) catalyst efficiency has fallen below the threshold for Bank 1. This means that the vehicle's emissions control system is not effectively reducing the amount of nitrogen oxide in the exhaust gases, which can lead to increased emissions of this harmful pollutant into the environment.
Common Causes of P20EE GMC
- Contaminated DEF: Contaminants in the diesel exhaust fluid can cause the SCR catalyst to become less effective.
- DEF Quality: The use of low-quality or incorrect DEF can lead to catalyst degradation.
- Exhaust System Leaks: Leaks in the exhaust system can allow DEF to escape before reaching the catalyst, reducing its efficiency.
- Faulty NOx Sensor: A malfunctioning NOx sensor may provide inaccurate data to the engine control module, leading to improper DEF dosing.
- Catalyst Degradation: Over time, the SCR catalyst can degrade due to normal wear and tear, reducing its efficiency.
Symptoms of P20EE GMC
- Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
- Reduced Fuel Efficiency: A decrease in fuel efficiency may occur due to the inefficient conversion of NOx in the exhaust system.
- Failed Emissions Test: The vehicle may fail emissions testing due to higher NOx emissions.
- Limp Mode: The vehicle may go into a reduced power or limp mode to prevent further damage to the engine.
How to Fix P20EE GMC
- Check and Replace DEF: Ensure that the diesel exhaust fluid is not contaminated and replace it with a high-quality, manufacturer-approved DEF.
- Inspect and Repair Exhaust Leaks: Check the exhaust system for leaks and repair any damaged components to prevent DEF from escaping.
- Replace NOx Sensor: If the NOx sensor is faulty, replace it to ensure accurate data is being sent to the engine control module.
- Clean or Replace SCR Catalyst: Depending on the severity of the degradation, the SCR catalyst may need to be cleaned or replaced to restore efficiency.
- Clear Codes and Test Drive: After completing the repairs, clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P20EE GMC
The cost of resolving a P20EE GMC code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, replacing the diesel exhaust fluid and NOx sensor can cost between $200 and $500, while cleaning or replacing the SCR catalyst can range from $500 to $1500. Labor costs can add an additional $100 to $300 per hour, depending on the shop's rates and location. Therefore, the total repair cost can range from $300 to $2000 or more. It's recommended to consult with a qualified mechanic to get a more accurate estimate based on the vehicle's make and model.
Tech Notes for P20EE GMC
2010 GMC Savana
2011 GMC Savana
2011 GMC Sierra
GMC Factory Service Bulletin OBDII Code P20EE
Need more information about the P20EE GMC code?
Need more information on how to fix the P20EE GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P20EE GMC code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P20EE GMC Code
1. What are common symptoms of OBDII code P20EE GMC (SCR NOx Catalyst Efficiency Below Threshold Bank 1)?
Symptoms may include the check engine light illuminating, reduced engine performance, increased fuel consumption, and potential emission issues.
2. What are possible causes of OBDII code P20EE GMC?
Potential causes may include a malfunctioning SCR (Selective Catalytic Reduction) system, faulty NOx sensor, exhaust leaks, contaminated DEF (Diesel Exhaust Fluid), or issues with the catalytic converter.
3. How can I diagnose the cause of OBDII code P20EE GMC?
Diagnosing the code typically involves using a diagnostic scanner to retrieve specific data related to the SCR system, NOx sensor, and catalyst efficiency. Additionally, a visual inspection of the exhaust system for leaks or damage is recommended.
4. Can I continue driving with OBDII code P20EE GMC active?
While some drivers may choose to continue driving with the code active, it is advisable to address the issue promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance.
5. How can I repair OBDII code P20EE GMC?
Repair options may include replacing the NOx sensor, inspecting and repairing any exhaust leaks, flushing and refilling the DEF system, or replacing the catalytic converter if necessary. It is recommended to follow the manufacturer's repair guidelines.
6. Is it possible to clear OBDII code P20EE GMC without addressing the underlying issue?
Clearing the code without resolving the root cause, such as a malfunctioning SCR system or faulty sensor, may result in the code reappearing once the system performs another self-check. It is best to address the issue for a long-term solution.
7. How can I prevent OBDII code P20EE GMC from recurring?
Regular maintenance of the SCR system, NOx sensor, and exhaust system components can help prevent the code from reoccurring. Additionally, using quality DEF and following recommended service intervals can aid in preventing issues.
8. Can a DIY enthusiast repair OBDII code P20EE GMC?
Some repairs related to this code, such as inspecting for exhaust leaks or checking DEF levels, may be manageable for DIY enthusiasts with the necessary tools and knowledge. However, more complex repairs involving sensor replacement or SCR system troubleshooting may require professional assistance.
9. Will OBDII code P20EE GMC cause my vehicle to fail emissions testing?
If left unresolved, the code may result in a failed emissions test due to the reduced efficiency of the SCR catalyst. It is recommended to address the issue before undergoing emissions testing to ensure compliance.
10. Does OBDII code P20EE GMC affect the overall performance of the vehicle?
Yes, this code can impact the vehicle's performance by triggering reduced engine power modes, affecting fuel efficiency, and potentially causing drivability issues. Resolving the underlying problem is crucial to restore optimal performance.
Discuss the causes and fixes for P20EE GMC OBDII Code
Code P20EE GMC 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.