DTC codes / P24xx · Auxiliary emission controls / P241E
P241E indicates that the powertrain control module (PCM) has commanded the reductant heater coolant control valve to open, but the valve remains stuck closed. The PCM detects this by monitoring the coolant temperature sensor circuit or valve position feedback, and it sets the code when the expected temperature rise or flow change does not occur within a calibrated time.
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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