P20ED Code - SCR NOx Pre-Catalyst Over Temperature Bank 1
Quick Answer
The Selective Catalyst Reduction (SCR) catalyst is monitored to ensure it is capable of NOx conversion. 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
- P20ED indicates SCR NOx Pre-Catalyst Over Temperature 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 P20ED Description
The reductant, Diesel Exhaust Fluid (DEF), which is used as part of the SCR catalyst reaction, is monitored to ensure the tank is not refilled with an improper reductant. Upon detection of a refill event, the monitor is activated. After the SCR Catalyst Efficiency Monitor has completed and the SCR has been determined to be functional, the efficiency monitor continues to calculate the cumulative efficiency of the system. Each subsequent value for cumulative efficiency is included in two filtering routines, one for short term efficiency and the other for long term efficiency. If the difference between the two filtered efficiencies becomes greater than a threshold, a fault is indicated. the short term efficiency needs to be less than 0.20 and the delta between short and long term efficiency needs to be greater than 0.10.
What are the Possible Causes of the DTC P20ED?
- Faulty NOx Sensor
- Diesel Exhaust Fluid
- Faulty Selective Catalyst Reduction (SCR) Catalyst
How to Fix the DTC P20ED?
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 P20ED 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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Information for Specific Makes
- P20ED Dodge — SCR NOx Pre-Catalyst Over Temperature Bank 1
- P20ED Ford — SCR NOx Pre-Catalyst Over Temperature Bank 1
Frequently Asked Questions about P20ED Code
1. What are common symptoms of OBDII code P20ED (SCR NOx Pre-Catalyst Over Temperature Bank 1)?
- Common symptoms include the illumination of the check engine light, reduced engine power, and potential exhaust system overheating.
2. What are possible causes of OBDII code P20ED?
- Causes may include a faulty SCR (selective catalytic reduction) NOx sensor, issues with the SCR system, a malfunctioning NOx catalyst, or exhaust system leaks.
3. How serious is OBDII code P20ED?
- This code should be addressed promptly to prevent potential damage to the catalytic converter and ensure compliance with emissions regulations.
4. Can driving with OBDII code P20ED cause further damage to the vehicle?
- Continuing to drive with this code may lead to reduced engine performance, increased emissions, and potential damage to the catalytic converter.
5. How do I diagnose OBDII code P20ED?
- Diagnosis typically involves using a diagnostic scanner to retrieve the code, inspecting the SCR system components, and testing the NOx sensor.
6. What are some repair tips for OBDII code P20ED?
- Repair tips may include checking and replacing the NOx sensor, inspecting and repairing any exhaust leaks, and ensuring proper function of the SCR system.
7. Can I reset the OBDII code P20ED without fixing the underlying issue?
- It is possible to clear the code temporarily, but it will likely reappear if the root cause is not addressed. It is recommended to fix the issue to prevent further problems.
8. How much does it cost to repair OBDII code P20ED?
- Repair costs can vary depending on the specific issue causing the code, but they may range from a few hundred to a few thousand dollars, including parts and labor.
9. Is it safe to continue driving with OBDII code P20ED?
- It is not recommended to drive with this code active, as it may lead to decreased engine performance, increased emissions, and potential damage to the catalytic converter.
10. Can I fix OBDII code P20ED myself, or do I need a mechanic?
- While some DIY enthusiasts may be able to address simple causes like sensor replacement, complex issues with the SCR system should be handled by a qualified mechanic to ensure proper repairs.
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