P2453Generic code

P2453 Code: Diesel Particulate Filter Pressure Sensor A Circuit Range/Performance

The P2453 code means the diesel particulate filter pressure sensor gives a reading that is electrically valid but does not match what the computer expects. The computer cannot calculate the soot load or decide when to regenerate. Drive with caution, because the filter may not regenerate.

Severity
Medium
Can I keep driving?
Yes, but with caution
Estimated cost
$60 to $300
Difficulty
Medium
System
Emissions Control
Applies to
All OBD2 vehicles

Updated Reviewed by Renzo Chacca

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What the P2453 code means

The diesel particulate filter (DPF) traps soot from a diesel engine. When it fills up, the computer burns the soot off in a regeneration: it raises the exhaust temperature above 550 °C (1,020 °F) for a few minutes, usually while you drive at a steady speed. A differential pressure sensor measures the back pressure across the filter to estimate how much soot it holds.

The sensor gets a 5 V reference and a ground from the computer and returns a signal between roughly 0.5 and 4.5 V. A range fault, like the P2453 code, tells you the sensor is measuring, but measuring wrong, or that there is a real abnormal condition.

The sensor has two hoses, one before and one after the filter. Cracked hoses or hoses plugged with soot cause as many faults as the sensor itself.

This kind of fault does not usually give itself up to a multimeter, because electrically everything looks right. You have to compare what the part says with reality: use a gauge, a thermometer or a tachometer, or command the component with the scan tool and see whether the physical result matches the command.

P2453 code symptoms

  • Check engine light on.
  • The computer cannot calculate the soot load or decide when to regenerate.

Likely causes of the P2453 code

  1. Sensor degraded or out of calibration. It gives believable readings that are wrong.
  2. Real abnormal condition. The system is actually working outside normal.
  3. High resistance in the connector from corrosion, which shifts the reading.
  4. Damaged or clogged port or hose, depending on the type of sensor.

How to diagnose the P2453 code step by step

  1. Read the sensor value on the scan tool and compare it with what you expect.
  2. Inspect the connector for corrosion, water or loose pins.
  3. Check supply and ground with the key on: the reference should be correct and the ground voltage drop should be under 0.1 V.
  4. Measure the signal with the connector plugged in and see whether it changes with the operating condition.
  5. Do a wiggle test on the harness with the scan tool in graph mode.
  6. Check continuity of each wire to the computer, which should be under 1 ohm.

How to fix the P2453 code

  • Repair the connector or the wiring.
  • Replace the sensor if the tests confirm it is bad.
  • Correct the real condition if there is one.
  • Clear the codes and verify with a road test.

Technical reference data

  • 5 V reference; signal near 0.5 to 1 V with the engine off.
  • The signal rises with exhaust flow and with soot load.
  • Approximate values only: check the manufacturer data for your vehicle.

Brand-specific notes

Cracked or soot-plugged sensor hoses are a favorite cause of a range fault. Look at them before you condemn the sensor, and remember that the P2453 code can also be set by a filter that is truly restricted.

P2453 on Diesel Vehicles From Many Makes

Common on diesels from Volkswagen, Audi, Seat, Peugeot, Citroen, Renault, Ford, Mercedes-Benz, BMW, Toyota Hilux, Nissan Navara and Chevrolet. Short city trips are the filter worst enemy.

Frequently asked questions about P2453

Can I drive with a P2453 code?
With caution. The P2453 code means the filter may not regenerate, so soot can keep building up.
Does the sensor have to be replaced?
Only if the tests confirm it. The connector and the wiring fail just as often as the sensor, so check them first.
What does the DPF pressure sensor do?
The diesel particulate filter (DPF) traps soot from a diesel engine. When it fills up, the computer burns the soot off in a regeneration: it raises the exhaust temperature above 550 °C (1,020 °F) for a few minutes, usually while you drive at a steady speed. A differential pressure sensor measures the back pressure across the filter to estimate how much soot it holds.
What does the P2453 code mean?
It means the DPF pressure sensor reading is electrically valid but does not match what the computer expects, either because the sensor is off or because the system is really working abnormally.
How much does it cost to fix P2453?
Roughly $60 to $300. A hose or connector repair is at the low end, and a new sensor costs more.

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