What does the P20E8 code mean?
The P20E8 code indicates a problem in the system that reduces pollution in diesel engines. This system, called SCR (or DEF/AdBlue), uses a special fluid to reduce harmful emissions.
This error message appears when the reducer fluid pressure is too low, which prevents the system from functioning properly.
Possible symptoms:
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The engine warning light illuminates on the dashboard
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Possible warning messages related to emissions or AdBlue may appear
Common causes of the problem:
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DEF pump faulty
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Reducer fluid injector damaged
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Purge valve of the system no longer working correctly
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Hose or pipe of the reducer fluid punctured or clogged
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Pressure sensor faulty
How to resolve the problem?
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Visually inspect the cables and connectors related to the DEF system: look for cut wires, broken pins, or signs of corrosion.
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Check the main components of the system: pump, injector, sensor, valve, and pipes.
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If in doubt, a diagnosis with an OBD tool can help you precisely locate the fault.
🔧 Tip: This type of problem can prevent the proper functioning of the anti-pollution system and, eventually, limit the vehicle’s performance or prevent it from starting. Therefore, it is recommended to have the vehicle checked by a professional quickly.