What does code P248A mean?

Q: What does code P248A mean?

Reductant Heater A Sense Circuit Low. P248A indicates that the powertrain control module has detected an abnormally low voltage on the sense circuit for the reductant heater, which is the heating element used to keep diesel exhaust fluid (DEF) from freezing. The computer compares the expected signal from the heater's feedback circuit against the actual low voltage and sets this code when the circuit is grounded, open, or shorted to a low-voltage source.

DTC codes / P24xx · Auxiliary emission controls / P248A

P248AReductant Heater A Sense Circuit Low

P248A indicates that the powertrain control module has detected an abnormally low voltage on the sense circuit for the reductant heater, which is the heating element used to keep diesel exhaust fluid (DEF) from freezing. The computer compares the expected signal from the heater's feedback circuit against the actual low voltage and sets this code when the circuit is grounded, open, or shorted to a low-voltage source.

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.