The P20EE code is associated with a malfunction in the SCR (Selective Catalytic Reduction) system, which is crucial for emission control in modern vehicles. This code must be taken very seriously, as it can lead to severe damage to the catalyst if the issue is not resolved quickly. It is essential to address this code immediately to avoid further damage to the exhaust system and the overall engine performance.
Symptoms Associated with Code P20EE
Symptoms of code P20EE may include the following:
- Excessive black smoke from the exhaust gases.
- Decreased engine performance, including a loss of power.
- Reduced energy efficiency, which may result in increased fuel consumption.
- Other codes related to the SCR system or emissions may also be stored, indicating additional problems.
Common Causes of Code P20EE
Several issues can cause the P20EE code to be recorded. Possible causes include:
- Faulty sensors: Oxygen (O2) sensor, NOx sensor, or exhaust gas temperature sensor.
- Inoperative SCR system: This may be due to a general failure of the SCR system.
- Faulty SCR injector, which prevents proper injection of DEF fluid.
- Insufficient or incorrect DEF fluid level, preventing the SCR system from functioning correctly.
- Problem with the SCR controller or programming error.
- Exhaust leaks before the catalyst, which disrupt the SCR system’s operation.
- Installation of aftermarket or high-performance exhaust parts, which may be incompatible with the vehicle’s SCR system.
How to Repair Code P20EE?
Troubleshooting Steps
- Checking for other SCR or emission error codes:
- If other SCR codes or emission-related codes are present, it is important to address them before focusing on P20EE.
- Repairing exhaust leaks:
- All exhaust leaks before the catalyst must be repaired. A leak can distort exhaust gas temperature measurements and impair the SCR system’s operation.
- Using a diagnostic scanner:
- A diagnostic scanner, a digital voltmeter/ohmmeter (DVOM), and an infrared thermometer will be needed to diagnose and resolve this issue.
- Consult vehicle-specific diagnostic information, including technical service bulletins (TSBs).
- Visual inspection:
- Inspect the SCR injection system, exhaust temperature sensors, NOx sensors, and the wiring/connectors associated with the oxygen sensors. Replace or repair any damaged wires or connectors.
- Performing tests with the scanner:
- Connect the diagnostic scanner and retrieve all stored codes, along with relevant data.
- Test the vehicle until the PCM (Powertrain Control Module) enters readiness mode or the code is reset.
- Testing sensors:
- Check the oxygen, NOx, and exhaust gas temperature sensors for any inconsistencies in the scanner data. Use a DVOM to test faulty sensors. If a sensor does not meet the manufacturer’s specifications, it must be replaced.
- Checking the SCR system:
- If the sensors and circuits appear to be functioning correctly, but the code persists, there may be an issue with the catalyst element or the SCR system itself.
- Checking the DEF fluid:
- Ensure the DEF tank is filled with the appropriate fluid and has not been contaminated.
Conclusion
The P20EE code indicates a critical problem in the SCR system and requires immediate attention to avoid severe damage to the catalyst and vehicle performance. Thorough diagnosis and prompt repair are essential to maintain engine performance and ensure compliance with emission standards.