What does code P248C mean?

Q: What does code P248C mean?

Reductant Heater B Sense Circuit Low. P248C means the engine control module has detected that the reductant heater B sense circuit is reporting a voltage lower than expected, indicating a short to ground or an open circuit in that signal path. The reductant heater warms the diesel exhaust fluid to keep it from freezing and to help it vaporize properly for selective catalytic reduction, so a low sense signal can prevent the heater from being controlled correctly.

DTC codes / P24xx · Auxiliary emission controls / P248C

P248CReductant Heater B Sense Circuit Low

P248C means the engine control module has detected that the reductant heater B sense circuit is reporting a voltage lower than expected, indicating a short to ground or an open circuit in that signal path. The reductant heater warms the diesel exhaust fluid to keep it from freezing and to help it vaporize properly for selective catalytic reduction, so a low sense signal can prevent the heater from being controlled correctly.

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.