P245E — Diesel Particulate Filter Pressure Sensor "B" Circuit

OBD2 code P245E flags a problem with the diesel particulate filter (DPF) (diesel particulate filter pressure sensor "B" circuit). 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

Read the code and freeze frame Connect an OBD2 scanner, confirm P245E is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
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.
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.
Subsystem check Read DPF soot load and differential pressure in live data before and after a forced regeneration.
Subsystem check Verify exhaust temperature and pressure sensor readings are plausible at idle and under load.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P245E does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P245E (parts and labor, USD, independent shop rates): Forced regeneration / cleaning: $150–$400; Replace a pressure or temperature sensor: $150–$450; DPF replacement: $1,500–$4,000. Overall, fixing P245E 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 are the symptoms of P245E?

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

What does OBD2 code P245E mean?

How do I diagnose P245E myself?

Start with a scan: confirm P245E, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the diesel particulate filter (DPF), and verify the suspect component against live data before buying parts.

What is the most common cause of P245E?

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 P245E clear itself?

Sometimes P245E 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.

What does P245E mean?

Behind P245E is a specific failure in the diesel particulate filter (DPF): diesel particulate filter pressure sensor "B" circuit. The onboard computer stores it in the powertrain (engine/transmission) group after verifying the fault over repeated checks.

The module monitors this system continuously while driving. When readings fall outside the expected range for a defined number of drive cycles, it stores P245E 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 P245E

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

What causes P245E?

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

How to diagnose P245E

Connect an OBD2 scanner, confirm P245E is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
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.
Visually inspect the wiring harness and connectors related to the diesel particulate filter (DPF) for damage, corrosion, chafing or poor contact.
Read DPF soot load and differential pressure in live data before and after a forced regeneration.
Verify exhaust temperature and pressure sensor readings are plausible at idle and under load.
Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P245E does not return.

How to fix P245E

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

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

How much does it cost to fix P245E?

Repair cost depends on which component actually failed. Typical scenarios for P245E (parts and labor, USD, independent shop rates):

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

Overall, fixing P245E 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 P245E?

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.