What does code P24DF mean?

Q: What does code P24DF mean?

Reductant Purge Control Valve B Stuck Open. P24DF indicates that the powertrain control module has detected a fault with the reductant purge control valve B, specifically that the valve is stuck open. This valve is part of the diesel exhaust fluid (DEF) system and is responsible for purging residual reductant from the injector lines to prevent crystallization and ensure proper operation of the selective catalytic reduction (SCR) system.

DTC codes / P24xx · Auxiliary emission controls / P24DF

P24DFReductant Purge Control Valve B Stuck Open

P24DF indicates that the powertrain control module has detected a fault with the reductant purge control valve B, specifically that the valve is stuck open. This valve is part of the diesel exhaust fluid (DEF) system and is responsible for purging residual reductant from the injector lines to prevent crystallization and ensure proper operation of the selective catalytic reduction (SCR) system.

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.