P244B Jaguar - DPF Differential Pressure Too High: Causes & Fix

P244B means the engine control unit (ECU) has detected that the pressure difference across the DPF is higher than expected. This is typically caused by a partially blocked DPF (often due to repeated short trips), a faulty differential pressure sensor, or a regeneration process that failed to complete. The fix can range from a £150 forced regeneration to a £1,200–£2,200 DPF replacement.

Most common real cause: soot build-up from insufficient motorway driving - typically £150–£300 for a forced regen [PATTERN DATA]
Worst case: a failed DPF requiring replacement - £1,200–£2,200 fitted [PATTERN DATA]
Often accompanied by DPF warning light, limp mode, and a noticeable drop in performance
Commonly appears alongside P2463 (DPF soot accumulation) or P2002 (DPF efficiency below threshold)

Do not ignore P244B. Continued driving with a blocked DPF can lead to a full replacement, which is significantly more expensive than a regen.

What P244B Actually Means

The diesel particulate filter (DPF) traps soot from exhaust gases to meet emissions regulations. Over time, soot accumulates and must be burned off through a process called regeneration (regen). During regeneration, the ECU raises exhaust temperatures to burn the soot to ash. The differential pressure sensor measures the pressure difference between the inlet and outlet of the DPF. When the DPF becomes blocked, the pressure difference rises. P244B is triggered when the ECU detects this pressure difference is too high, meaning the DPF is more restricted than it should be. On Jaguar diesels - from the older 2.2 Duratorq to the newer Ingenium 2.0D - this code typically appears when the DPF has not been allowed to regenerate properly, often due to repeated short, cold journeys that never get the exhaust hot enough. However, it can also be caused by a faulty pressure sensor, a leak in the pressure pipes, or a failed DPF itself.

Symptoms You'll Notice Alongside P244B

DPF warning light illuminated on the dashboard (amber, often flashing)
Engine management light also appears in many cases
Limp mode - reduced power, often accompanied by a noticeable lack of throttle response
Increased fuel consumption and a harsh, rough engine note
In severe cases, the car may fail a regeneration attempt and remain in limp mode
A strong smell of diesel or soot from the exhaust (unburnt fuel during failed regen)
Excessive black smoke from the exhaust (especially under acceleration) - see our black smoke symptom guide

If you see the DPF light and the car enters limp mode, you should arrange a diagnostic check as soon as possible.

Common Causes of P244B, Ranked Cheapest‑First

Based on real diagnostic patterns from Jaguar specialists and the Engines Market 2025 data. The order reflects both likelihood and typical repair cost.

Cause	Likelihood	Typical Cost (Fitted)	Notes
Soot build‑up - insufficient regeneration	High	£150–£300 (forced regen)	Often caused by repeated short trips; a forced regen or motorway run can clear it
Faulty differential pressure sensor	Medium	£200–£400	Sensor may read incorrectly; test with diagnostic tool before replacing
Leaking or blocked pressure pipes	Low	£100–£250	Hoses between sensor and DPF can crack or block, giving false readings
Failed DPF (beyond regeneration)	Low	£1,200–£2,200	Ash build‑up or thermal damage means the filter must be replaced
EGR valve or cooler restriction	Low	£400–£800	Can affect regeneration; often a contributory factor, see our EGR failure page
Fuel injector issues (causing soot)	Low	£500–£1,500	Faulty injectors can overfuel, increasing soot production; see black smoke

Cost figures [PATTERN DATA] - indicative independent‑specialist pricing, not drawn from our engine replacement dataset.

Diagnostic Order - Cheapest‑First

A competent Jaguar specialist will follow this order to avoid misdiagnosing a blocked DPF when it's simply a sensor or pipe issue.

Scan for Fault Codes

Read all codes to confirm P244B and check for others like P2463 or P2002, which help pin down the issue.

Check DPF Differential Pressure Sensor

Use live data to compare sensor readings against expected values. A sensor reading that doesn't change with engine speed is likely faulty.

Inspect Pressure Pipes

Check for cracks, blockages, or moisture in the hoses connecting the sensor to the DPF. Clean or replace as needed.

Perform a Forced Regeneration

If the sensor and pipes are fine, attempt a forced regen using diagnostic software. This will burn off accumulated soot and clear the code.

Inspect the DPF for Damage

If a regen fails or the code returns, the DPF itself may be beyond repair. A bore scope can confirm damage or ash overload.

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Not sure where to start?

Our diagnostic wizard walks the same order, or use the registration lookup to confirm your engine and DPF type.

Can You Still Drive Your Jaguar with P244B?

It depends on the severity, but in most cases: only to get it directly to a garage. If the DPF light is on but the car is not in limp mode, you may be able to drive it - ideally on a motorway run to attempt a passive regeneration. However, if the car has entered limp mode, you should not continue driving. Continued driving with a blocked DPF can cause the filter to overheat, leading to thermal damage and a full replacement. In the worst case, a blocked DPF can cause turbocharger damage or even a fire. The safest course is to have the car recovered to a specialist who can perform a forced regeneration. If you must drive, limit it to a short, low‑speed journey and pay close attention to the warning lights.

Related Fault Codes

P244B is often accompanied by other codes. The combination helps pinpoint the root cause.

P2463 - DPF Soot Accumulation

This code indicates the DPF is full of soot and needs a regeneration. It often appears alongside P244B and confirms the filter is blocked.

P2002 - DPF Efficiency Below Threshold

This code suggests the DPF is not filtering particles effectively, often due to a physical failure or a sensor issue.

P204F - Reductant System Performance

Relates to the AdBlue system; if the AdBlue system fails, the DPF can become clogged as the regeneration is inhibited.

DPF Blockage - Symptom Guide

Not a fault code, but a key symptom that often precedes P244B; see our symptom guide for more detail on warning signs.

Frequently Asked Questions About P244B

What does P244B mean on a Jaguar?

It means the DPF differential pressure sensor has detected that the pressure difference across the DPF is too high, indicating a blocked or restricted diesel particulate filter.

Can I drive my Jaguar with P244B?

Only if the car is not in limp mode - and even then, only to get it directly to a garage. If the car is in limp mode, stop driving immediately to avoid costly DPF or turbocharger damage.

Is P244B a serious fault?

Yes, it's considered serious. While it may be fixed with a forced regeneration, if ignored it can lead to a full DPF replacement costing over £2,000.

How much does it cost to fix P244B on a Jaguar?

The cost ranges from about £150 for a forced regeneration to £2,200 for a DPF replacement. Sensor or pipe repairs are typically £100–£400. Diagnostic time is usually 1–2 hours.

Can a forced regeneration fix P244B?

Often, yes - if the DPF is merely clogged with soot. If the DPF has been damaged by overheating or is overloaded with ash, a replacement will be necessary.

What causes P244B on a Jaguar diesel?

The most common cause is repeated short journeys that don't allow the DPF to regenerate. Other causes include a faulty differential pressure sensor, leaking pressure pipes, or a failed DPF.

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