What does code P24D3 mean?

Q: What does code P24D3 mean?

Reductant Heater B Sense Circuit. P24D3 indicates that the powertrain control module (PCM) has detected an abnormal condition in the sense circuit for the reductant heater 'B', which is part of the diesel exhaust fluid (DEF) system. The heater is used to thaw frozen DEF in cold weather, and the sense circuit reports the heater's electrical status back to the PCM. The code is set when the voltage or current on that sense circuit falls outside the expected range, preventing the PCM from confirming proper heater operation.

DTC codes / P24xx · Auxiliary emission controls / P24D3

P24D3Reductant Heater B Sense Circuit

P24D3 indicates that the powertrain control module (PCM) has detected an abnormal condition in the sense circuit for the reductant heater 'B', which is part of the diesel exhaust fluid (DEF) system. The heater is used to thaw frozen DEF in cold weather, and the sense circuit reports the heater's electrical status back to the PCM. The code is set when the voltage or current on that sense circuit falls outside the expected range, preventing the PCM from confirming proper heater operation.

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.