P221C

Reductant Heater B Current Too Low

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
Increased fuel consumption
Problems with the SCR system
Possible error messages in the AdBlue system

Causes

Reagent heating element malfunction
Open or short circuit in the heater circuit
Poor contact in wiring connectors
Faulty relay or fuse
Problems with the SCR control unit

How to Fix

Check heater circuit fuses and relays
Check the integrity of wiring and connectors
Measure the resistance of the heating element
Check the operation of the SCR control unit
Replace the faulty heating element if necessary

Related codes

P221A P221B P221D