P244B — Diesel Particulate Filter Differential Pressure Too High Bank 1

OBD2 code P244B flags a problem with the diesel particulate filter (DPF) (diesel particulate filter differential pressure too high bank 1). Short, gentle driving to a shop is usually possible. Common culprits: failed regeneration due to sensor or wiring faults, engine faults producing excess soot (EGR, injectors), faulty differential pressure or exhaust temperature sensor.

powertrain (engine/transmission)

Is it safe to drive?

Drive with caution Drive only enough to reach a service. A saturated DPF pushes the car into limp mode, and continued driving with failed regenerations dilutes engine oil with fuel — that damages the engine itself.

How to diagnose with an OBD scanner

  1. Read the code and freeze frame Connect an OBD2 scanner, confirm P244B is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
  3. Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the diesel particulate filter (DPF) for damage, corrosion, chafing or poor contact.
  4. Subsystem check Read DPF soot load and differential pressure in live data before and after a forced regeneration.
  5. Subsystem check Verify exhaust temperature and pressure sensor readings are plausible at idle and under load.
  6. Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P244B does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P244B (parts and labor, USD, independent shop rates): Forced regeneration / cleaning: $150–$400; DPF replacement: $1,500–$4,000; Replace a pressure or temperature sensor: $150–$450. Overall, fixing P244B usually costs between $150 and $4,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What is the most common cause of P244B?

The most common causes are: failed regeneration due to sensor or wiring faults, engine faults producing excess soot (EGR, injectors), faulty differential pressure or exhaust temperature sensor.

Will P244B clear itself?

Sometimes P244B clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

Is it safe to drive with P244B?

Drive only enough to reach a service. A saturated DPF pushes the car into limp mode, and continued driving with failed regenerations dilutes engine oil with fuel — that damages the engine itself.

What are the symptoms of P244B?

Drivers most often notice: frequent regeneration attempts, loss of power and limp mode, rising oil level from fuel dilution, increased fuel consumption.

How much does it cost to fix P244B?

Forced regeneration / cleaning — $150–$400; DPF replacement — $1,500–$4,000; Replace a pressure or temperature sensor — $150–$450. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

What does P244B mean?

P244B is logged by the onboard diagnostics when the diesel particulate filter (DPF) does not behave as expected. The official definition is “Diesel Particulate Filter Differential Pressure Too High Bank 1”. This is a powertrain (engine/transmission) category code.

“Bank 1” means the side of the engine that contains cylinder 1. Verify which side that is on your specific engine before testing or replacing parts.

The module monitors this system continuously while driving. When readings fall outside the expected range for a defined number of drive cycles, it stores P244B and switches on the warning light. Freeze frame data saved with the code shows the exact conditions — rpm, load, temperature, speed — at the moment the fault was detected, which is the best starting point for diagnosis.

Common symptoms of P244B

  • frequent regeneration attempts
  • loss of power and limp mode
  • rising oil level from fuel dilution
  • increased fuel consumption
  • Check Engine or DPF warning light on

What causes P244B?

  • faulty differential pressure or exhaust temperature sensor
  • soot-overloaded DPF from short-trip driving
  • excessive ash loading (end of DPF life)
  • engine faults producing excess soot (EGR, injectors)
  • failed regeneration due to sensor or wiring faults

How to diagnose P244B

  1. Connect an OBD2 scanner, confirm P244B is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
  3. Visually inspect the wiring harness and connectors related to the diesel particulate filter (DPF) for damage, corrosion, chafing or poor contact.
  4. Read DPF soot load and differential pressure in live data before and after a forced regeneration.
  5. Verify exhaust temperature and pressure sensor readings are plausible at idle and under load.
  6. Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P244B does not return.

How to fix P244B

Start with the cheapest and most common causes before replacing expensive parts:

  • Forced regeneration / cleaning — $150–$400
  • DPF replacement — $1,500–$4,000
  • Replace a pressure or temperature sensor — $150–$450

How much does it cost to fix P244B?

Repair cost depends on which component actually failed. Typical scenarios for P244B (parts and labor, USD, independent shop rates):

  • Forced regeneration / cleaning: $150–$400
  • DPF replacement: $1,500–$4,000
  • Replace a pressure or temperature sensor: $150–$450

Overall, fixing P244B usually costs between $150 and $4,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with P244B?

Drive only enough to reach a service. A saturated DPF pushes the car into limp mode, and continued driving with failed regenerations dilutes engine oil with fuel — that damages the engine itself.

Related OBD2 codes