P2D20
Reductant System Flow - Blocked
P2D20 is an OBD-II diagnostic trouble code meaning: Reductant System Flow - Blocked. Common causes: crystallization of urea in the reductant system, reductant filter is dirty or clogged. Estimated repair cost: $17–94.
Symptoms
- Increased emissions of harmful substances
- Reduced engine power
- Illumination of the fault warning lamp (Check Engine)
- Activation of emergency operation
- SCR system error message on instrument panel
Causes
- Crystallization of urea in the reductant system
- Reductant filter is dirty or clogged
- Reductant supply pump malfunction
- Mechanical damage or kinking of supply tubes
- Sticky or faulty SCR valves
How to Fix
- Visual inspection of the reductant system for damage
- Checking and cleaning the reductant injection nozzle
- Replacing the reductant filter if necessary
- Diagnostics and replacement of the reductant pump in case of malfunction
- Flushing the reductant system to remove urea crystals
Related codes
Error P2D20 by Vehicle Brand
FAQ
What does the P2D20 code mean?
P2D20 is an OBD-II diagnostic trouble code that indicates: Reductant System Flow - Blocked
What causes a P2D20 error code?
The most common causes of P2D20 include: Crystallization of urea in the reductant system; Reductant filter is dirty or clogged; Reductant supply pump malfunction; Mechanical damage or kinking of supply tubes.
How do I fix a P2D20 diagnostic trouble code?
To fix P2D20: Visual inspection of the reductant system for damage. Checking and cleaning the reductant injection nozzle. Replacing the reductant filter if necessary. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2D20?
Limited driving only, diagnose soon
How much does it cost to fix P2D20?
The estimated repair cost for P2D20 is $17–94. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat