Code Definition

P243C — Diesel Particulate Filter Regeneration Frequency

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P243C

P243C is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P243C is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

P243C is set when the engine control module determines the diesel particulate filter is regenerating far more often than the calibration expects, typically measured as the distance or running time between successful regenerations falling below a threshold. Frequent regeneration is a symptom rather than a fault in itself: something is loading the filter with soot faster than normal, or the module is being told the filter is fuller than it really is. On the Mazda SKYACTIV D 2.2 the factory description is an abnormally short regeneration interval, and members meet it on the CX 3, CX 5, Mazda 3 an...

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