P244ADiesel Particulate Filter Differential Pressure Too Low (Bank 1)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- MIL on in the first faulty trip
- Soot load shown near zero, regeneration not triggered
- Visible smoke if the substrate is damaged
- Likely causes
- LikelyUpstream pressure hose disconnected, split or blocked
- PossibleDifferential pressure sensor reading too low (Ford 6.7 L, Land Rover TDV6 bulletins)
- RareFilter substrate cracked, melted or removed
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.