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P2454: Diesel particulate filter pressure sensor A circuit low

The ECU sees too low a voltage from the diesel particulate filter pressure sensor. Almost always an electrical fault in a wire or connector.

Code P2454 at a glance
CodeP2454
SystemEngine and transmission
GroupP24xx, EGR, EVAP and particulate filter
TypeGeneric: it means the same on every make
Can you keep driving?With care

What P2454 means

This sensor measures exhaust pressure at the particulate filter, usually the difference between inlet and outlet, so the ECU knows how much soot it holds and when to regenerate. On sensor A the ECU sees a voltage below what is possible, almost always because of an electrical fault. Which sensor is A is set by each manufacturer, though many cars have only one.

Most common causes

  • Sensor connector loose or corroded
  • Broken signal or supply wire
  • Signal wire shorting to earth
  • Faulty pressure sensor
  • Problem with the ECU’s 5 volt sensor supply

Symptoms

  • Engine warning light on
  • Possible limp mode with reduced power
  • Regenerations delayed or run too often
  • Higher fuel consumption if it regenerates frequently

Can you drive with P2454?

With care You can drive, but get it to a garage soon: without this reading the ECU regenerates blindly and the filter can end up blocked.

How to check it

With the ignition on and engine off, live differential pressure should read close to zero, and it should rise when you rev the engine at standstill. If it stays fixed or shows silly values, check the sensor connector and pipes.

How to read and clear P2454 with Final OBD

Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P2454 with this same explanation and whether it’s confirmed, pending or permanent.

With Free you read this code with its short description for nothing, and clear it if the engine stores it over standard OBD. With Pro you get the full explanation, how the car was running when it was logged (revs, temperature, load) and clearing in every control unit.

Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before the ITV. It’s all in how to read and clear fault codes and in the ITV and OBD.

Similar codes

P2454 is a generic code, so it means the same on any make, for example on Audi, Fiat, Kia, Mazda, Opel / Vauxhall, Toyota. See what Final OBD does on your car in makes and models.

What does code P2454 mean?

This sensor measures exhaust pressure at the particulate filter, usually the difference between inlet and outlet, so the ECU knows how much soot it holds and when to regenerate. On sensor A the ECU sees a voltage below what is possible, almost always because of an electrical fault. Which sensor is A is set by each manufacturer, though many cars have only one.

Can you drive with P2454?

You can drive, but get it to a garage soon: without this reading the ECU regenerates blindly and the filter can end up blocked.

How do you clear P2454?

With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P2454 comes back.