OBD-II code · Powertrain (generic, extended)
P223A Reductant Heater E Control Circuit
Reductant Heater E Control Circuit: the control circuit has an electrical fault. The reductant (DEF/AdBlue) heater keeps the urea fluid from freezing; a fault can impair SCR dosing in cold conditions.
Is it safe to drive with P223A?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyHeater winding or wiring fault
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.7–3 h
- Emissions test
- Likely to fail
- Parts involved
- Reductant Line Heater E
Related codes
- P223BReductant Heater F Control Circuit
- P2237O2 Sensor Pumping Current Circuit (Bank 1 Sensor 1)
- P2238O2 Sensor Pumping Current Circuit Low (Bank 1 Sensor 1)
- P2239O2 Sensor Pumping Current Circuit High (Bank 1 Sensor 1)
- P223CO2 Sensor Pumping Current Range/Performance (Bank 1)
- P223DO2 Sensor Pumping Current Range/Performance (Bank 2)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.