Code Definition

P24A4 (00-AF) — Aftertreatment Fuel (AF) Soot Conditions Too High

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

About P24A4

P24A4 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.

When P24A4 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

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 P24A4 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

DTC P24A4 indicates the calculated soot load in the diesel particulate filter has risen above the maximum allowed level. The module estimates soot loading from differential pressure, exhaust temperature, engine operating data, and regeneration history, and sets this code when that estimate exceeds the calibrated limit while regeneration has been unsuccessful, incomplete, or inhibited. Excessive soot threatens to restrict the exhaust and can damage the filter if the engine is driven hard in this state, so the module typically warns the driver and may limit power. The cause is usually repeated i...

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