The DPF pressure sensor is seeing a greater pressure drop across the filter than it should. This is a symptom, not a component failure — and it often starts with driving style or a sensor glitch long before the filter itself is blocked.
P244B means the differential pressure sensor across the DPF is seeing a higher-than-expected pressure difference. On most Land Rover diesels this is a sensor or pipe blockage long before it's a blocked DPF — and proper diagnosis saves hundreds of pounds.
Do not let anyone sell you a DPF replacement before the pressure sensor and its pipes have been checked. Full diagnostic order below.
In a modern diesel, the ECU uses a differential pressure sensor to measure the pressure drop across the DPF. P244B is logged when the ECU sees a pressure difference higher than the threshold it expects for the current driving conditions — typically at idle or low load. Crucially, this code describes a reading, not a diagnosis. The pressure difference could be genuinely high (a blocked DPF), or it could be a measurement error caused by a sensor fault, blocked reference pipes, or even a software glitch. That distinction can be the difference between a £80 sensor clean and a £1,200 DPF replacement. This code appears across the full range of JLR common-rail diesels, from the 204DTD Ingenium to the 306DT V6, and the diagnostic approach is essentially identical regardless of which engine triggers it.
Ordered by how often each turns out to be the real culprit — with typical fitted cost against each, so you can sanity-check any quote you've been given.
| Cause | Likelihood | Typical Cost (fitted) | Notes |
|---|---|---|---|
| Blocked or split pressure sensor hoses | Very High | £80–£150 | Cheapest possible outcome — the sensor reads incorrectly because the reference pipes are blocked or leaking |
| Failing differential pressure sensor | High | £150–£280 | Sensor reports false high pressure; DPF is fine |
| DPF soot loading too high (driving pattern) | Medium | £200–£400 | Forced regeneration, often caused by repeated short journeys without motorway running |
| DPF blockage / ash accumulation | Medium | £400–£900 | Usually on higher-mileage vehicles; carbon buildup blocks the filter |
| DPF internal failure (cracked/melted) | Low | £900–£1,200 | Genuine but least common — ruled out only after everything above is eliminated |
Cost figures [PATTERN DATA] — indicative independent-specialist pricing, not drawn from our engine replacement dataset.
Check the two reference pipes from the DPF to the sensor for blockages, splits, or condensation. A blocked pipe is a very common cause and costs almost nothing to clear.
A specialist compares differential pressure sensor readings against known-good values at idle. A reading above 0.1 bar at idle often points to a sensor or pipe issue, not a blocked filter.
If P244B appears alone, suspect sensor or hoses. If it appears with P2002 or P2463, the DPF is genuinely blocked.
Live data or forced regeneration test shows actual soot load and whether the DPF can regenerate normally.
If steps 1–4 show the filter is genuinely blocked with ash and won't regenerate, replacement becomes the correct answer.
Our diagnostic wizard walks the same order, or confirm your engine first with the registration lookup.
Conditionally, yes — but get it addressed quickly. P244B on its own is not an engine-destroying fault. However, ignoring it risks DPF damage, failed regenerations, and eventually a blocked filter that will force limp mode and can lead to expensive turbocharger or injector problems. If the vehicle has entered limp mode, motorway driving becomes genuinely unsafe because you cannot accelerate normally to merge or overtake. Get it looked at within a week, sooner if you see the DPF warning light flashing or solid.
For short, non-motorway journeys to reach a garage, generally yes — but not for normal use, and not if you can see the DPF warning light flashing or if the vehicle has entered limp mode. Prolonged driving with this code risks damaging the DPF, turbocharger, and injectors.
No. Across the five ranked causes, a genuinely blocked DPF is only middle of the pack. A blocked sensor hose or a failing differential pressure sensor are both far more likely and cost a fraction as much.
That depends on the cause. If the DPF is blocked with soot but still physically intact, a forced regeneration often fixes it. If the DPF is blocked with ash, regeneration will not work — the filter needs cleaning or replacement. If the sensor or hoses are at fault, regeneration won't change the reading.
Expect one to two hours of diagnostic time at an independent JLR specialist. Many will offset that cost against the repair if you proceed with them.
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