P221C: The AdBlue heater B current is below normal
The AdBlue heater B current is below normal. It may be the part itself, its connector or the wiring.
| Code | P221C |
|---|---|
| System | Engine and transmission |
| Group | P22xx, NOx sensors, oxygen sensors and emissions |
| Type | Generic: it means the same on every make |
How to read and clear P221C with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P221C with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P2216 The NOx sensor (bank 2) gives a higher signal than normal
- P2217 The NOx sensor (bank 2) fails now and then
- P2218 The NOx sensor heater control (bank 2) has a broken or disconnected wire
- P2219 The NOx sensor heater control (bank 2) gives a lower signal than normal
- P221D The AdBlue heater B current is above normal
- P221E The AdBlue heater C current is below normal
- P221F The AdBlue heater C current is above normal
- P2220 The NOx sensor heater control (bank 2) gives a higher signal than normal
- P2200 NOx sensor circuit fault (bank 1)
- P2201 NOx sensor circuit range or performance problem (bank 1)
- P2227 Barometric pressure sensor A range or performance problem
- P2228 Barometric pressure sensor A circuit low
What does code P221C mean?
The AdBlue heater B current is below normal. It may be the part itself, its connector or the wiring.
How do you clear P221C?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P221C comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
