What does code P223A mean?

Q: What does code P223A mean?

Reductant Heater E Control Circuit. P223A indicates that the engine control module has detected a fault in the control circuit for the reductant heater, which is the heating element used to keep diesel exhaust fluid (DEF) from freezing in selective catalytic reduction systems. The computer monitors the electrical circuit that commands the heater on and off, and it sets this code when the circuit's voltage or current does not match the expected values for the commanded state.

DTC codes / P22xx · Fuel and air metering (injector circuits) / P223A

P223AReductant Heater E Control Circuit

P223A indicates that the engine control module has detected a fault in the control circuit for the reductant heater, which is the heating element used to keep diesel exhaust fluid (DEF) from freezing in selective catalytic reduction systems. The computer monitors the electrical circuit that commands the heater on and off, and it sets this code when the circuit's voltage or current does not match the expected values for the commanded state.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.