DTC codes / P24xx · Auxiliary emission controls / P246B
P246B means the engine computer has determined that the vehicle's operating conditions are not suitable for a diesel particulate filter (DPF) regeneration, so it has postponed the process. The computer monitors parameters such as exhaust temperature, engine load, vehicle speed, and soot loading, and when they fall outside the allowed window it stores this code to explain why regeneration has not occurred.
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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