P20A4

Reductant Purge Control Valve A Stuck Open

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–89 (est.)

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

P20A5 P20A6 P20A7