P221D

Reductant Heater B Current Too High

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$50–133 (est.)

Symptoms

Check Engine Light Is On
Reduced engine power
Increased fuel consumption
SCR System Error Message
Increased NOx emissions

Causes

Short circuit in the heater circuit
Heating element malfunction
Heater relay problems
SCR control unit malfunction
Wiring harness damage

How to Fix

Check the resistance of the heating element
Check the integrity of the wiring harness
Check the operation of the heater relay
Scan the SCR control unit for errors
If necessary, replace the heating element

Related codes

P221C P221E P2200