P244A: How to Diagnose & Fix — Diesel Particulate Filter Differential Pressure Too Low (Bank 1)
16 vehicles · 10 makes · $100-$4,000 repair
How to diagnose and fix P244A: 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.
Jaguar XF · 2009–2018
Diesel XF models suffer from DPF regeneration issues, particularly in urban driving where the exhaust never reaches regeneration temperature. The DPF clogs with soot, triggering warning lights and reduced power. Repeated failed regeneration cycles can permanently damage the filter.
Common Symptoms
- DPF warning light on dashboard
- Reduced engine power
- Increased fuel consumption
- Strong diesel smell from exhaust
- Engine management light
How to Fix
Perform a forced DPF regeneration via dealer diagnostic tool. If the DPF is heavily blocked, chemical cleaning or replacement is required. Adopt a driving pattern that includes regular highway runs of 20+ minutes at 2,500+ RPM to allow passive regeneration.
Owner tips & cautions
- TipTake the XF diesel on a 30-minute highway run once a week to allow passive DPF regeneration. Short urban trips are the #1 killer of diesel DPFs.
Audi A3 · 2010–2015
The DPF can become clogged, especially with city driving and short trips that don't allow for proper regeneration cycles. This is more common after the emissions fix was applied. A clogged DPF causes reduced power and warning lights. OEM DPF assembly part numbers: 1K0254706LX (earlier production) and 1K0254708GX (later production). Fits 2009-2014 Audi A3 TDI with CBEA/CJAA engines. DPF differential pressure sensor: available from KermaTDI for CJAA/CKRA engines.
Common Symptoms
- DPF warning light
- Reduced power (limp mode)
- Increased fuel consumption during regen
- Strong exhaust smell during regen
- Check engine light with DPF codes
How to Fix
Allow DPF regeneration by driving at highway speeds (65+ MPH) for 15-20 minutes regularly. For forced regen via VCDS: go to adaptation, enter security code 12233, change channel 18 from 0 to 1 while maintaining highway speed. Monitor soot levels via VCDS (Particle Filter Carbon Mass). If severely clogged, professional DPF cleaning with Liqui Moly 20110 DPF Cleaning Fluid (used with 20112 DPF Cleaning Flush and 7945/7946 spray tools) can help. Note: cleaning removes soot only, not ash - ash accumulation requires DPF replacement. OEM replacement DPF often back-ordered for weeks.
Sources for this issue (1)
Mercedes-Benz GLE · 2016–2020
The diesel particulate filter (DPF) clogs prematurely, especially on vehicles used primarily for short trips. Failed regeneration cycles cause reduced power, increased fuel consumption, and eventually limp mode.
Common Symptoms
- Reduced engine power warning
- Increased fuel consumption
How to Fix
Force a DPF regeneration cycle using a diagnostic tool. If the DPF is heavily clogged, a professional cleaning service can restore it for $300-500. In severe cases, DPF replacement runs $2,000-4,000. Drive at highway speed for 30+ minutes regularly to allow passive regeneration.
Owner tips & cautions
- TipTake the GLE diesel on a 30-minute highway drive once a week minimum. Short city trips prevent passive DPF regeneration and lead to premature clogging.
Peugeot 208 · 2012–2026
Peugeot 3008 · 2009–2026
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P244A 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 P244A mean?
P244A stands for "Diesel Particulate Filter Differential Pressure Too Low (Bank 1)." P244A is a diesel emissions code meaning the differential pressure across the diesel particulate filter (DPF) on bank 1 is too low. A pressure sensor measures the difference between the DPF inlet and outlet to gauge how loaded with soot the filter is; an abnormally low reading suggests the filter isn't restricting flow as expected. This can indicate a cracked, missing, or hollowed-out DPF substrate, or a sensor/hose problem giving a false low reading. It points to the DPF or its differential pressure sensing system rather than the engine itself.
What are the most common causes of P244A?
The most common causes of P244A are: Cracked, damaged, or failed (hollow) DPF substrate, Faulty DPF differential pressure sensor, Disconnected, cracked, or leaking pressure sensor hoses, Clogged or blocked pressure sensor reference lines, Exhaust leak upstream or around the DPF, Aftermarket or tampered/removed DPF, Wiring or connector fault at the pressure sensor. The specific cause varies by vehicle.
How much does it cost to fix P244A?
Repair costs for P244A range from $100 to $4,000, depending on the vehicle and root cause.
Which vehicles are affected by P244A?
Au7o has documented P244A across 16 vehicle models from 10 manufacturers: Audi, Citroen, GMC, Jaguar, Mercedes-Benz, Peugeot, Renault, SEAT, Skoda, Volkswagen.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.