P20A4
Reductant Purge Control Valve A Stuck Open
P20A4 is an OBD-II diagnostic trouble code meaning: Reductant Purge Control Valve A Stuck Open. Common causes: mechanical valve jamming, open or short circuit in valve control circuit. Estimated repair cost: $28–89.
Symptoms
- Check Engine light comes on
- Increased AdBlue fluid consumption
- Reduced engine power
- SCR system malfunction message appears
- Possible smell of urea from the exhaust system
Causes
- Mechanical valve jamming
- Open or short circuit in valve control circuit
- Malfunction of the solenoid part of the valve
- Problems with the wiring harness to the valve
- Contamination or crystallization of urea in the valve
How to Fix
- Check the condition of the reducing agent purge valve
- Check control circuit and valve power supply
- Clean the valve from possible deposits
- Replace faulty valve if necessary
- Reset the error code and check the system operation
Related codes
Error P20A4 by Vehicle Brand
FAQ
What does the P20A4 code mean?
P20A4 is an OBD-II diagnostic trouble code that indicates: Reductant Purge Control Valve A Stuck Open
What causes a P20A4 error code?
The most common causes of P20A4 include: Mechanical valve jamming; Open or short circuit in valve control circuit; Malfunction of the solenoid part of the valve; Problems with the wiring harness to the valve.
How do I fix a P20A4 diagnostic trouble code?
To fix P20A4: Check the condition of the reducing agent purge valve. Check control circuit and valve power supply. Clean the valve from possible deposits. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P20A4?
Yes, but get it checked soon
How much does it cost to fix P20A4?
The estimated repair cost for P20A4 is $28–89. Actual cost depends on your vehicle, location, and labor rates.
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