P244A on Mercedes-Benz: How to Diagnose & Fix
Diesel Particulate Filter Differential Pressure Too Low (Bank 1)
2 Mercedes-Benz models · 2 documented issues · $250-$4,000 repair
P244A on Mercedes-Benz by model: symptoms, diagnosis and fix
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.
On diesel A-Class models (A180d/A200d/A220d, OM608/OM654 engines) driven mainly on short, low-speed urban trips, the DPF cannot reach the high exhaust temperatures needed for passive regeneration. Soot accumulates, the DPF/engine warning light illuminates, and the car can enter limp mode with a stored 'soot content too high' fault. A very common complaint among EU-spec city-driven diesels.
Common Symptoms
- DPF / engine warning light
- Limp mode / reduced power
- Increased fuel consumption
- Frequent regeneration cycles
- Excessive smoke
- Fan running after stop
How to Fix
First remedy is a sustained highway run (15-30 min at higher rpm) to trigger active regeneration. If that fails, a workshop performs a forced/static regeneration via diagnostics. Severely clogged filters require professional DPF cleaning or replacement. Maintaining EGR valve, turbo, and injectors and using correct spec diesel reduces recurrence.
Sources for this issue (3)
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 on a Mercedes-Benz?
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. On Mercedes-Benz it is documented across 2 models: GLE, A-Class.
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 on a Mercedes-Benz?
Published repair estimates on Mercedes-Benz range from $250 to $4,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P244A on a different make?
View P244A across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.