P2454: Diesel Particulate Filter Pressure Sensor 'A' Circuit Low
Severity: medium
What it means: The engine computer sees a lower-than-expected signal from the DPF (diesel particulate filter) pressure sensor, often from a sensor, wiring or hose problem.
Safe to drive? Usually drivable gently, but limp mode is common and a clogged filter left alone can get worse. Get it checked.
Common symptoms
- Check-engine light
- Reduced power or limp mode, often on hills
- DPF warning
Likely causes, ranked
- Faulty DPF pressure sensorDIY
- Cracked, blocked or swapped sensor hosesDIY
- Wiring or connector problemDIY
- Clogged DPF or failed regenerationShop
Vehicle-specific notes
- 2010–2012 Mercedes-Benz GL350: OM642 BlueTEC: MBWorld owners describe losing power on hills with P2454; one fixed it with a new dealer pressure sensor. Read the full answer · Source
What it means: The engine computer sees a lower-than-expected signal from the DPF (diesel particulate filter) pressure sensor, often from a sensor, wiring or hose problem.
Severity: Medium. Safe to drive? Usually drivable gently, but limp mode is common and a clogged filter left alone can get worse. Get it checked.
DIY or shop?
Sensor and hose checks are DIY for many diesel owners. DPF cleaning or replacement is a shop job.
Before you replace parts
- Check the sensor hoses for cracks, blockages or being swapped.
- Check the sensor connector and wiring.
- Read all stored codes, including DPF soot and regeneration codes.
- Have a shop check the DPF before replacing it.
Safety / mechanic note
Verify with a mechanic. Losing power climbing a hill or merging is dangerous. A code points to a circuit or system, not always a specific part.