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Diesel particulate filter (DPF)

P2458 Diesel Particulate Filter (DPF) Regeneration Duration

The ECU monitors how long an active DPF regeneration takes. P2458 is set when a regeneration does not complete within the calibrated time limit, so the soot load is not reduced as expected.

Common causes

  • Driving too short or at too low a speed to complete regeneration
  • Faulty exhaust gas temperature sensor
  • Faulty differential pressure sensor
  • Oxidation catalyst (DOC) not reaching the required temperature
  • Injector, boost or EGR problems affecting exhaust temperature

Typical symptoms

  • Check engine light and/or DPF warning light on
  • Raised idle speed or cooling fan running after shutdown
  • Increased fuel consumption
  • Reduced power if the soot load keeps rising

P2458 and NuoVolta

If the DPF has been removed for off-road or motorsport use, where permitted by law, the NuoVolta DPF / ADV Removal solution disables regeneration in the ECU calibration and the DTC removal feature can disable this code. With the filter fitted, check the temperature and pressure sensors first.

DPF / ADV Removal Available for 189 ECUs

Related codes

P2002Particulate Filter Efficiency Below Threshold (Bank 1) P242FDiesel Particulate Filter (DPF) Restriction - Ash Accumulation P244ADiesel Particulate Filter (DPF) Differential Pressure Too Low (Bank 1) P244BDiesel Particulate Filter (DPF) Differential Pressure Too High (Bank 1) P2453Diesel Particulate Filter (DPF) Pressure Sensor A Circuit Range/Performance P2454Diesel Particulate Filter (DPF) Pressure Sensor A Circuit Low P2455Diesel Particulate Filter (DPF) Pressure Sensor A Circuit High P2459Diesel Particulate Filter (DPF) Regeneration Frequency

Diagnose and repair real faults first. Removing or disabling emission systems is only permitted where allowed by law, for example for off-road or motorsport use.