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Diesel particulate filter (DPF)

P244A Diesel Particulate Filter (DPF) Differential Pressure Too Low (Bank 1)

The ECU monitors the pressure difference across the DPF and compares it with the value expected for the current exhaust flow. P244A is set when the measured differential pressure is too low, which can indicate a damaged or missing filter or a sensor or hose problem.

Common causes

  • Cracked, damaged or removed DPF substrate
  • Disconnected, split or blocked sensor hoses
  • Sensor hoses connected the wrong way round
  • Faulty differential pressure sensor
  • Exhaust leak near the filter

Typical symptoms

  • Check engine light (MIL) on
  • Regeneration disabled
  • Possible visible smoke
  • Reduced power on some vehicles

P244A and NuoVolta

When the DPF has been removed for off-road or motorsport use, where permitted by law, the NuoVolta DPF / ADV Removal solution adjusts the ECU calibration and the DTC removal feature can disable this code. If the filter is fitted, check the sensor hoses and filter condition first.

DPF / ADV Removal Available for 189 ECUs

Related codes

P2002Particulate Filter Efficiency Below Threshold (Bank 1) P242FDiesel Particulate Filter (DPF) Restriction - Ash Accumulation 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 P2458Diesel Particulate Filter (DPF) Regeneration Duration 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.