P221C
Reductant Heater B Current Too Low
P221C is an OBD-II diagnostic trouble code meaning: Reductant Heater B Current Too Low. Common causes: reagent heating element malfunction, open or short circuit in the heater circuit. Estimated repair cost: $56–167.
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
Error P221C by Vehicle Brand
FAQ
What does the P221C code mean?
P221C is an OBD-II diagnostic trouble code that indicates: Reductant Heater B Current Too Low
What causes a P221C error code?
The most common causes of P221C include: Reagent heating element malfunction; Open or short circuit in the heater circuit; Poor contact in wiring connectors; Faulty relay or fuse.
How do I fix a P221C diagnostic trouble code?
To fix P221C: Check heater circuit fuses and relays. Check the integrity of wiring and connectors. Measure the resistance of the heating element. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P221C?
Yes, but get it checked soon
How much does it cost to fix P221C?
The estimated repair cost for P221C is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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