Emissions

P2453 — Particulate Filter Pressure Sensor Circuit Range/Performance

Severity: medium Drive with care, to a shop

What P2453 means

The differential pressure sensor compares exhaust pressure before and after the diesel particulate filter (DPF). The engine computer uses it to estimate soot load and decide when to regenerate. P2453 sets when the signal does not match what is expected for the current engine load and exhaust flow. The cause can be a bad sensor or hose, or a genuinely clogged filter.

Symptoms

  • Check engine or DPF warning light on
  • Reduced power or limp mode
  • Frequent regeneration attempts
  • Regeneration that fails to complete
  • Higher fuel consumption
  • Cooling fans or idle changing during regeneration

Possible causes

  1. Clogged diesel particulate filter
  2. Failed differential pressure sensor
  3. Cracked, disconnected or plugged pressure hoses
  4. Wiring or connector damage, corrosion or shorts
  5. Exhaust leak near the filter
  6. Rarely, a faulty PCM

How to diagnose

  1. Scan for codes and freeze frame data, and look for related injector, EGR, boost or exhaust temperature codes
  2. Read soot load, ash load and differential pressure in live data
  3. With the engine off, pressure difference should be near zero; a large offset points to the sensor
  4. Inspect the sensor hoses for cracks, kinks, soot plugging and correct routing
  5. Check the connector and wiring: supply, ground, reference voltage and signal
  6. Compare exhaust gas temperature sensor readings for plausibility
  7. Confirm regeneration conditions can be met (trip profile, warm engine)
  8. If the sensor checks out, assess actual DPF condition and exhaust leaks

Common fixes

  • Replace or clear the sensor hoses
  • Replace the differential pressure sensor
  • Repair the wiring or connector
  • Perform a forced regeneration or professional DPF cleaning
  • Replace the DPF if it is clogged with ash or damaged

Questions and answers

What does P2453 mean?

The PCM is getting a pressure signal from the DPF sensor that doesn't fit the engine's operating conditions. It could be the sensor, its hoses or a clogged filter.

Can I drive with P2453?

For a short time, yes, especially if the car still pulls normally. Don't wait long though, since a clogged filter can fail and replacing it is expensive.

Will a highway drive fix it?

Sometimes it starts a regeneration and burns off soot when the filter is moderately loaded. If the sensor or hoses are at fault, the code will return.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.