P20FA

Reductant Pump B Control Circuit/Open

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–278 (est.)

Symptoms

Check Engine Light Is On
SCR system error message (AdBlue)
Reduced engine power
Increased fuel consumption
Ammonia smell from exhaust system

Causes

Open or short circuit in the pump control circuit
Pump control relay malfunction
Wiring harness damage
Reagent pump failure
Problems with the engine control unit

How to Fix

Check the integrity of the wiring and connectors of the control circuit
Check the functionality of the pump relay
Test the resistance of the pump winding
Check power and ground in the control circuit
If necessary, replace the reagent pump

Related codes

P20FB P20FC P20E4