Code Definition

P2458 — Diesel particulate filter regeneration duration

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

About P2458

P2458 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 P2458 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 manages diesel particulate filter regeneration by raising exhaust temperature to burn off the soot trapped in the filter. DTC P2458 sets when the ECM detects that a regeneration event is taking longer than the expected duration, indicating the filter is not clearing efficiently or that something is preventing the temperature and conditions needed for a complete burn. Prolonged or incomplete regeneration allows soot and ash to build up, which raises exhaust back pressure and can trigger limp mode. When the code is set the driver may notice reduced power, higher fuel co...

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