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TuningBot DTC Database · v4.37.15

P2456 Particulate Filter Pressure Sensor A Circuit Intermittent/Erratic

Generic (OBD-II) interpretation in the TuningBot DTC database.

P · PowertrainEmissionsOBD2

What P2456 means

P2456
Particulate Filter Pressure Sensor A Circuit Intermittent/Erratic Generic · emissions Data confidence 78%

The control module detected an unstable or intermittent signal in the Particulate Filter Pressure Sensor A circuit.

Symptoms

  • MIL or DPF warning illuminated
  • Possible reduced power or limp mode
  • Possible frequent regeneration attempts

Possible causes

  • Excessive soot load beyond regeneration limits
  • Differential pressure sensor or hose fault
  • Failed or interrupted regenerations (short trips)
  • Exhaust leak upstream of the sensor
  • Underlying engine fault increasing soot output

Recommended checks

  • Read soot load, ash load and differential pressure values
  • Check differential pressure sensor and hoses
  • Verify exhaust gas temperature sensor readings
  • Check for related injection, EGR or boost codes
  • Verify regeneration conditions can be met (trip profile)

Related and nearby codes

P24 range
P2400P2401P2402P2403P2404P2405P2406P2407P2408P2409P240AP240BP240CP240DP240EP240FP2410P2411

How to read P2456

P

Powertrain: engine, transmission and driveline systems.

2

Generic SAE-standard code: same meaning on every make.

456

Specific fault index within the subsystem.

Frequently asked questions about P2456

What does P2456 mean?

Particulate Filter Pressure Sensor A Circuit Intermittent/Erratic. The control module detected an unstable or intermittent signal in the Particulate Filter Pressure Sensor A circuit.

Is P2456 generic or manufacturer-specific?

P2456 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P2456 at file level?

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.

Other file services

Stage 1/2/3 TuningDPF RemovalEGR RemovalAdBlue / SCR RemovalDTC RemovalIMMO OFFSpeed Limiter (Vmax)

Understand the system behind this code: DPF System

ECU tuningDyno-tested results by model and engine See the results →

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