Code Definition

P246C — DPF Restriction Forced Limited Power

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

About P246C

P246C 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 P246C 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

The Engine Control Module monitors diesel particulate filter (DPF) loading using the DPF differential pressure sensor, the exhaust gas temperature sensors, and a calculated soot accumulation model. DTC P246C sets when the ECM determines that DPF restriction has exceeded a calibrated threshold and exhaust backpressure is high enough to risk engine or aftertreatment damage. In response it commands a forced reduced or limited power mode to lower exhaust flow and protect the engine and emissions system. The driver notices reduced power and a warning, and the underlying cause is usually a genuinely...

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