DTC codes / P24xx · Auxiliary emission controls / P241D
P241D indicates that the engine control module (ECM) has commanded a forced engine shutdown because the selective catalytic reduction (SCR) system has detected a fault that prevents it from meeting emissions regulations. The ECM typically triggers this after the diesel exhaust fluid (DEF) level is critically low, the DEF has been contaminated, or a SCR component has failed, and the vehicle has entered a inducement strategy that ultimately cuts engine power or shuts it down.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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