P20A5

Reductant Purge Control Valve A Stuck Closed

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Possible transition to emergency mode
Increased release of nitrogen oxides
SCR system error message on instrument panel

Causes

Mechanical valve jamming
Contamination or crystallization of the reductant
Valve wiring problems
Control relay malfunction
Control unit software error

How to Fix

Check the condition of the reductant purge valve
Check the integrity of wiring and connections
Clean or replace a stuck valve
Check the quality of the reductant in the system
Reset error and test drive

Related codes

P20A4 P20A6 P20A7