P221D
Reductant Heater B Current Too High
P221D is an OBD-II diagnostic trouble code meaning: Reductant Heater B Current Too High. Common causes: short circuit in the heater circuit, heating element malfunction. Estimated repair cost: $50–133.
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
Error P221D by Vehicle Brand
FAQ
What does the P221D code mean?
P221D is an OBD-II diagnostic trouble code that indicates: Reductant Heater B Current Too High
What causes a P221D error code?
The most common causes of P221D include: Short circuit in the heater circuit; Heating element malfunction; Heater relay problems; SCR control unit malfunction.
How do I fix a P221D diagnostic trouble code?
To fix P221D: Check the resistance of the heating element. Check the integrity of the wiring harness. Check the operation of the heater relay. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P221D?
Yes, but get it checked soon
How much does it cost to fix P221D?
The estimated repair cost for P221D is $50–133. Actual cost depends on your vehicle, location, and labor rates.
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