P245F — Diesel Particulate Filter Pressure Sensor "B" Circuit Range/Performance

OBD2 code P245F flags a problem with the diesel particulate filter (DPF) (diesel particulate filter pressure sensor "B" circuit range/performance). Short, gentle driving to a shop is usually possible. Common culprits: soot-overloaded DPF from short-trip driving, engine faults producing excess soot (EGR, injectors), excessive ash loading (end of DPF life).

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 P245F 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 Compare the diesel particulate filter pressure sensor "B" live reading against a known-good reference (specification or a correlated sensor) under the conditions from the freeze frame.
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 P245F does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P245F (parts and labor, USD, independent shop rates): Replace a pressure or temperature sensor: $150–$450; DPF replacement: $1,500–$4,000; Forced regeneration / cleaning: $150–$400. Overall, fixing P245F 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

Will P245F clear itself?

Sometimes P245F 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.

How do I diagnose P245F myself?

Start with a scan: confirm P245F, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the diesel particulate filter pressure sensor "B", and verify the suspect component against live data before buying parts.

What are the symptoms of P245F?

Drivers most often notice: Check Engine or DPF warning light on, loss of power and limp mode, rising oil level from fuel dilution, increased fuel consumption.

What is the most common cause of P245F?

The most common causes are: soot-overloaded DPF from short-trip driving, engine faults producing excess soot (EGR, injectors), excessive ash loading (end of DPF life).

What does OBD2 code P245F mean?

What does P245F mean?

Seeing P245F on your scanner? The control unit has caught the diesel particulate filter (DPF) operating outside its calibrated window. The formal description is “Diesel Particulate Filter Pressure Sensor "B" Circuit Range/Performance”, and the code is grouped under powertrain (engine/transmission) faults.

“Range/performance” means the signal from the diesel particulate filter pressure sensor "B" is electrically valid but does not match what the module expects for current operating conditions. The wiring is usually intact; the problem is a degraded component, a drifted sensor or a mechanical fault upstream.

To set P245F, the control module compares live readings of the diesel particulate filter (DPF) against calibrated limits, usually over several drive cycles. Alongside the code it stores a freeze frame — a snapshot of rpm, load, coolant temperature and vehicle speed at the moment of failure. Reading that snapshot first saves diagnostic time.

What causes P245F?

degraded or drifting diesel particulate filter pressure sensor "B"
mechanical fault that the sensor correctly reports
incorrect calibration after a module update or battery disconnect
excessive ash loading (end of DPF life)
soot-overloaded DPF from short-trip driving
faulty differential pressure or exhaust temperature sensor
failed regeneration due to sensor or wiring faults
engine faults producing excess soot (EGR, injectors)

Common symptoms of P245F

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

How to diagnose P245F

Connect an OBD2 scanner, confirm P245F 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.
Compare the diesel particulate filter pressure sensor "B" live reading against a known-good reference (specification or a correlated sensor) under the conditions from the freeze frame.
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 P245F does not return.

How to fix P245F

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

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

How much does it cost to fix P245F?

Repair cost depends on which component actually failed. Typical scenarios for P245F (parts and labor, USD, independent shop rates):

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

Overall, fixing P245F 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 P245F?

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.