Powertrain, generic (extended)

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

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P244A means the pressure difference across the bank 1 particulate filter is lower than exhaust flow and soot load predict. That points to a damaged or removed substrate or, far more often, to a pressure line that has slipped off, split or clogged. Ford's 2023 diesels use it as the missing substrate monitor: the measured filter inlet pressure stays below a flow-dependent limit, about 8 kPa at 300 m³/h, for 90 s. GM's 3.0 L LZO checks the upstream pipe and confirms a Type A fault after 240 of 400 samples. Ford replaced the pressure sensor on 2017–2018 Super Duty 6.7 L trucks when its key-on voltage was below 0.4 V, Land Rover the sensor on 2016 TDV6 models, and Volvo fits new sensor hoses on mild-hybrid petrol models from 2020. P2464 is the bank 2 version.

Likely causes

Upstream pressure hose disconnected, split or blocked
Differential pressure sensor reading too low (Ford 6.7 L, Land Rover TDV6 bulletins)
Filter substrate cracked, melted or removed

Symptoms

  • MIL on in the first faulty trip
  • Soot load shown near zero, regeneration not triggered
  • Visible smoke if the substrate is damaged

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–2,500
Time0.3–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

diesel particulate filterdpf diff pressure sensor

Related codes

P244BP2464P2452P2453P226D

References: fordservicecontent.com, gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov.