P244A code meaning
Diesel Particulate Filter Differential Pressure Too Low (Bank 1)
Powertrain system Generic code P24xx codes Check engine light
What P244A means
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 gasoline models from 2020. P2464 is the bank 2 version.
P244A at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P244A
- MIL on in the first faulty trip
- Soot load shown near zero, regeneration not triggered
- Visible smoke if the substrate is damaged
Common causes of P244A
- Most likelyUpstream pressure hose disconnected, split or blocked
- PossibleDifferential pressure sensor reading too low (Ford 6.7 L, Land Rover TDV6 bulletins)
- Less likelyFilter substrate cracked, melted or removed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Diesel particulate filterDPF diff pressure sensor
What each part of P244A means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 4A | The exact fault in that area. |
What to do next
- Note P244A and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P244A
What does P244A mean?
P244A means "Diesel Particulate Filter Differential Pressure Too Low (Bank 1)". P244A means the pressure difference across the bank 1 particulate filter is lower than exhaust flow and soot load predict. It is a generic code, so it means the same on every make.
Is it safe to drive with P244A?
Drive gently and only to a workshop. With P244A the car can go into limp mode (reduced power) to protect itself.
Will P244A fail an emissions test?
Yes, it can. P244A is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P244A to fix?
Difficulty: medium. A typical repair takes 0.3 to 3 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P244A clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.