Ford Power Stroke P244A: DPF Differential Pressure Too Low
P-Code P244A (FMI N/A) — Diesel Particulate Filter Differential Pressure Too Low
Quick Answer
P244A means DPF differential pressure reads lower than expected. Inspect pressure tubes and sensor accuracy, and check for a cracked filter before assuming the DPF is healthy.
Overview: Ford Power Stroke P-Code P244A
ProfessionalDieselRepair.com sees P244A paired with efficiency codes when a cracked DPF lets exhaust bypass the substrate. The PCM expects measurable restriction across the filter, and low delta-P tells it something is wrong with the measurement or the filter itself.
Repair Snapshot
Time
1 - 4 Hours
Difficulty
Intermediate
Parts Cost
$60 - $2,400
Dealer Labor
$550+
Tools Required
- Diesel Laptops
- Noregon JPRO
- Smoke Leak Detector
- Borescope
What P-Code P244A Means
P244A on Ford Power Stroke means DPF differential pressure is lower than the PCM expects for current operating conditions. This often indicates a cracked DPF substrate, leaking pressure tubes, or a failed differential pressure sensor rather than a clean filter.
Symptoms Drivers Notice
- Check engine light
- Possible companion P2002 efficiency code
- Regen behavior may appear abnormal in live data
- Usually no immediate drivability complaint
- Exhaust leak noise if pressure tubes are disconnected
Most Likely Root Causes
Cracked or failed DPF substrate allowing bypass flow
CommonExhaust passes through a fracture with little restriction, so differential pressure stays abnormally low.
Leaking or disconnected differential pressure sensor lines
CommonPressure never builds in the sense circuit, producing a stuck-low reading.
Faulty differential pressure sensor
OccasionalInternal sensor failure reports low pressure regardless of actual restriction.
Common Misdiagnoses (Don't Waste Parts)
Assuming low pressure means the DPF is clean and ignoring the code
Why it happens: Low restriction sounds like a good thing to owners.
Do this instead: This is a parts-cannon blind spot - correlate pressure with soot load. High soot with low delta-P is a red flag for sensor or filter damage.
Replacing the DPF without checking hoses and sensor
Why it happens: Efficiency companion codes push filter replacement.
Do this instead: Smoke-test lines and verify sensor output first; many fixes are inexpensive compared with a new assembly.
Master Tech Commentary
Mechanic's Notes
ProfessionalDieselRepair.com diagnostic shortcut: low DPF delta-P with high soot load is almost never a clean filter—it is a leak, cracked brick, or lying sensor. Smoke-test the pressure lines before any DPF quote.
Step-by-Step Diagnostic Procedure
- Step 1: Monitor DPF differential pressure in Diesel Laptops or Noregon JPRO at idle and during loaded acceleration.
- Step 2: Inspect pressure sensor hoses and ports for cracks, disconnects, or soot plugging that would bleed pressure.
- Step 3: Perform a visual and borescope inspection of the DPF when service procedure allows, looking for cracks or internal damage.
- Step 4: Compare pressure readings to soot load; very low pressure with high soot load suggests a sensor or leak issue.
- Step 5: Replace the differential pressure sensor only after verifying tube integrity and housing leaks.
Live Data & Freeze-Frame Tips
Log differential pressure during a forced regen. Pressure that stays flat while soot load drops indicates a measurement fault or filter bypass path.
Safety Warnings
- Allow exhaust to cool before disconnecting pressure lines.
- Wear eye protection when smoke-testing near hot pipes.
- Support exhaust components safely during inspection.
When to Limp In vs Tow
Not typically required unless companion codes have induced a severe derate.
Prevention Tips for Fleets & Owner-Operators
- Fix exhaust leaks promptly to protect sensor hoses.
- Avoid impact damage to the DPF from road debris.
- Clean pressure sensor ports during aftertreatment service.
Related Fault Codes
P244B
DPF differential pressure too high, the opposite pressure fault.
P2002
DPF efficiency below threshold, often linked when pressure data is unreliable.
Frequently Asked Questions
Can a cracked DPF cause P244A?
Yes. A fracture lets exhaust bypass the substrate and reduces measured differential pressure.
Is P244A an emergency?
Usually not immediately, but ignore it and companion efficiency codes may lead to derate.
How do I test pressure lines?
Inspect for cracks and use a smoke machine or manual pressure test to find leaks at hoses and ports.
Will a sensor fix clear P244A?
If the sensor or lines were the fault, yes. A cracked filter requires DPF repair regardless.
Can soot-plugged lines cause this code?
Plugged lines can produce erratic readings; low pressure specifically often indicates leaks or bypass.
Which scan tools show DPF delta-P?
Diesel Laptops and Noregon JPRO display differential pressure and soot data on Power Stroke trucks.
More Ford Power Stroke codes on this system
- Ford Power Stroke P-Code P2459 — DPF Regeneration Frequency
- Ford Power Stroke P-Code P203B — Reductant Tank Heater Performance
- Ford Power Stroke P-Code P2002 — DPF Efficiency Below Threshold
- Ford Power Stroke P-Code P226A — DEF Quality Sensor Performance
- Ford Power Stroke P-Code P242F — DPF Ash Accumulation
- Ford Power Stroke P-Code P20EE — SCR NOx Catalyst Efficiency
- Ford Power Stroke P-Code P20B9 — Reductant Injection Valve Performance
- Ford Power Stroke P-Code 2463 — Diesel Particulate Filter
Guides that go deeper
- DPF Differential Pressure Sensor Failure: Symptoms and Tests
A failed DPF differential pressure sensor skews soot logic and regen requests. Prove hoses and sensor voltage before you pull the filter.
- SPN 3251 High DPF Pressure: Sensor, Hoses, or a Packed Filter?
SPN 3251 means high DPF differential pressure—use gauge checks, hose tests, and soot/ash data to separate sensor faults from a packed filter.
- P0087 Code on a Diesel Truck: Fuel Rail Pressure Too Low Diagnosis
P0087 means measured fuel rail pressure fell below the ECM target—usually a clogged filter, weak lift pump, leaking injector, or failing high-pressure pump.