P244B: How to Diagnose & Fix — Diesel Particulate Filter Differential Pressure Too High (Bank 1)
6 vehicles · 6 makes · $100-$3,500 repair
How to diagnose and fix P244B: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Land Rover Discovery · 2010–2020
Diesel Discovery models suffer from DPF regeneration problems, especially when used for short journeys. The DPF becomes overloaded with soot and the active regeneration cycle cannot complete, leading to a blocked filter. Warning lights illuminate and the engine enters limp mode. Repeated failed regenerations cause the DPF to become permanently blocked, requiring expensive replacement.
Common Symptoms
- DPF warning light on dashboard
- Reduced engine power / limp mode
- Increased fuel consumption during regen attempt
- Hot exhaust smell
- Engine fan running at high speed
- Rough idle
How to Fix
Perform a forced DPF regeneration using JLR diagnostic equipment. If the DPF is heavily loaded but not damaged, a professional chemical clean can restore it. Replace the DPF if it is beyond cleaning. Prevent future issues by taking the vehicle on regular extended highway drives to allow passive regeneration.
Owner tips & cautions
- WarningIf you only do short trips, a diesel Discovery is the wrong vehicle. The DPF needs at least 20 minutes of highway driving weekly to stay clean.
Sources for this issue (1)
Ford Fiesta · 2011–2019
Diesel Fiestas frequently suffer diesel particulate filter (DPF) blockage and incomplete/failed regeneration, especially on cars used mainly for short, low-speed journeys that never reach regeneration temperature. Soot accumulates, the DPF warning light appears, and the car may enter limp mode or dump excess fuel into the oil during failed active regens (raising oil level and diluting it). Underlying triggers are often other faults — a leaking/faulty injector, stuck EGR, blocked intake, or failed DPF differential-pressure/EGT sensor — so the blocked DPF is frequently a symptom rather than the root cause.
Common Symptoms
- DPF / exhaust warning light
- Limp mode / reduced power
- Frequent regeneration attempts
- Rising engine oil level (fuel dilution)
- Excess smoke or smell
- Poor fuel economy after failed regen
How to Fix
When the DPF light shows, drive at a steady 40+ mph for ~20 minutes to allow passive/active regeneration before it fully blocks. If blocked, run a forced regeneration and diagnose the root cause: test the DPF pressure and EGT sensors, check EGR operation, and inspect for a leaking injector causing oil dilution. Clean or replace the DPF if soot loading is beyond limits, and change oil if fuel-diluted.
Sources for this issue (1)
Volkswagen T-Roc · 2018–2022
T-Roc TDI diesels (1.6 TDI and 2.0 TDI, EA288) used predominantly for short, low-speed trips suffer incomplete DPF (diesel particulate filter) regeneration, leading to soot build-up, the DPF warning light, reduced power/limp mode and increased fuel use. A sticking or carbon-fouled EGR valve worsens soot loading and accelerates filter clogging. AdBlue/SCR sensor or software faults are also reported (warning light failing to clear after a refill). Some 2.0 TDI 4Motion owners report unusually frequent regeneration cycles (every ~120–130 miles).
Common Symptoms
- DPF warning light
- Reduced power / limp mode
- Frequent regeneration cycles
- Increased fuel consumption
- Exhaust smoke
- AdBlue warning not clearing
How to Fix
Drive at sustained motorway speed for 15–20 minutes to allow a full active regeneration. Persistent blockage needs a forced regen, professional DPF clean, or filter replacement; a fouled EGR valve should be cleaned or replaced. AdBlue/SCR faults need sensor replacement or a software update. Avoid DPF delete (illegal for road use in EU/UK and an MOT/TÜV failure).
Sources for this issue (2)
GMC Sierra 2500HD · 2007–2010
Audi Q2 · 2016–2020
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P244B code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P244B mean?
P244B stands for "Diesel Particulate Filter Differential Pressure Too High (Bank 1)." This code applies to diesel vehicles and means the engine computer detected that the pressure difference across the diesel particulate filter (DPF) is higher than allowed, indicating the filter is heavily restricted. The DPF traps soot from the exhaust and is periodically cleaned through regeneration. Excessively high differential pressure means too much soot or ash is clogging the filter. This can reduce power, trigger limp mode, and risk damaging the DPF or turbo if ignored, so it should be addressed promptly.
What are the most common causes of P244B?
The most common causes of P244B are: Clogged DPF from soot or ash accumulation, Failed or incomplete regeneration cycles, Faulty DPF differential pressure sensor, Frequent short-trip driving preventing regen, Faulty EGR causing excess soot, Blocked or kinked pressure sensor hoses, Faulty exhaust temperature sensor affecting regen. The specific cause varies by vehicle.
How much does it cost to fix P244B?
Repair costs for P244B range from $100 to $3,500, depending on the vehicle and root cause.
Which vehicles are affected by P244B?
Au7o has documented P244B across 6 vehicle models from 6 manufacturers: Audi, Ford, GMC, Land Rover, Renault, Volkswagen.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.