P2453: Diesel particulate filter pressure sensor circuit range/performance
The particulate filter’s differential pressure sensor gives a reading that doesn’t make sense, or its circuit has a fault. The engine computer judges how full the filter is by this reading, so it may regenerate too seldom or at the wrong time.
Updated
What P2453 means
The engine computer judges how much soot a diesel particulate filter (DPF) holds by the pressure difference across it, measured by a differential pressure sensor. Two thin hoses connect the sensor to the exhaust in front of and behind the filter.
P2453 means the reading doesn’t make sense, for example it isn’t close to zero with the engine off. The computer then can’t judge the filter, and may regenerate it too seldom or at the wrong time.
P2452, P2454 and P2455: the sensor’s circuit
P2452 is a fault in the sensor’s circuit, P2454 a signal that’s too low and P2455 one that’s too high. The checks start with the plug and the wiring, then the hoses and the sensor. The meaning, causes and advice are the same as for P2453.
P2452: Diesel Particulate Filter Pressure Sensor Circuit
P2454: Diesel Particulate Filter Pressure Sensor Circuit Low
P2455: Diesel Particulate Filter Pressure Sensor Circuit High
Can I keep driving?
Check soon
Probably OK to drive short-term, but have it checked soon. A filter that isn’t regenerated properly keeps filling up, and many cars then limit the power, sometimes suddenly.
General guidance based on the code alone, not on the car’s actual condition. If in doubt, stop and ask a mechanic.
Without a valid reading the filter can keep filling up, and many cars limit the power once it’s full, sometimes suddenly, even on the motorway. Have it seen to before that happens.
Symptoms
- A particulate filter warning or the check engine light.
- Less power or limp mode, on some cars suddenly.
- Regenerations that happen too often, too seldom or not at all.
Common causes
- Split, blocked or disconnected pressure hose to the sensor. The most common cause. The hoses get very hot during regenerations and can harden, crack or block with soot.
- Faulty differential pressure sensor. A sensor that drifts shows a pressure difference with the engine off.
- Wiring or connector fault. A broken wire or a corroded plug; most likely behind P2452, P2454 and P2455.
Typical fixes
- Check both hoses between the sensor and the exhaust for splits, kinks, soot blockages and loose ends.
- Have the sensor’s reading checked with the engine off: it should show close to no pressure difference.
- Check the sensor’s plug and wiring, and replace the sensor if it’s faulty.
- Clear the code after the repair. If the filter filled up in the meantime, it may need a regeneration with a tool for your make, which Read My Car can’t start.
Questions
Can I drive with P2453?
Probably for a short time, but have it checked soon. A filter that isn’t regenerated properly keeps filling up, and many cars then limit the power, sometimes suddenly.
Do I need a new particulate filter?
Usually not for this code. It’s about the sensor’s reading, and a split or blocked hose is the most common cause. The filter may need a regeneration or cleaning if it filled up while the sensor wasn’t working.