What does code P248D mean?

Q: What does code P248D mean?

Reductant Heater B Sense Circuit High. P248D indicates that the powertrain control module has detected an abnormally high voltage on the sense circuit for reductant heater B, which is part of the diesel exhaust fluid injection system. The computer expects a specific voltage range from this feedback circuit, and a reading above the calibrated threshold tells it the circuit is open, shorted to voltage, or the heater element has failed.

DTC codes / P24xx · Auxiliary emission controls / P248D

P248DReductant Heater B Sense Circuit High

P248D indicates that the powertrain control module has detected an abnormally high voltage on the sense circuit for reductant heater B, which is part of the diesel exhaust fluid injection system. The computer expects a specific voltage range from this feedback circuit, and a reading above the calibrated threshold tells it the circuit is open, shorted to voltage, or the heater element has failed.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

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