P20AB

Reductant Injection Air Pressure Control Valve Stuck Closed

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–89 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Increased fuel consumption
Increased NOx emissions
SCR system error message on dashboard

Causes

Mechanical valve jamming
Valve deposit accumulation
Valve wiring problems
Control relay malfunction
Control unit software error

How to Fix

Check the condition of the valve and its electrical connections
Clean the valve from deposits
Check the operation of the control relay
Replace faulty valve if necessary
Reset the error and check the system operation

Related codes

P20EE P20B9 P20A0