What does code P221E mean?

Q: What does code P221E mean?

Reductant Heater C Current Too Low. P221E indicates that the powertrain control module has detected a current draw on the reductant heater circuit for cylinder bank 3 that is lower than expected, meaning the heater element is not receiving enough electrical current to warm the diesel exhaust fluid properly. The computer monitors the heater circuit and flags this code when the measured current falls below the calibrated threshold for the given conditions.

DTC codes / P22xx · Fuel and air metering (injector circuits) / P221E

P221EReductant Heater C Current Too Low

P221E indicates that the powertrain control module has detected a current draw on the reductant heater circuit for cylinder bank 3 that is lower than expected, meaning the heater element is not receiving enough electrical current to warm the diesel exhaust fluid properly. The computer monitors the heater circuit and flags this code when the measured current falls below the calibrated threshold for the given conditions.

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.