Diesel Particulate Filter Pressure Sensor A Circuit High
The P2455 code means the vehicle's onboard diagnostic system has detected: Diesel Particulate Filter Pressure Sensor A Circuit High. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $100 - $500 (parts and labor)
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Common Symptoms
- Check Engine Light on
- DPF warning light may be on
- Regeneration may run when not needed
Probable Causes (Ranked by Likelihood)
- Open circuit or short to voltage in the sensor circuit High
- Failed DPF differential pressure sensor High
- Blocked pressure tube pinning the reading high Moderate
Step-by-Step Diagnostic Procedure
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Circuit-high is the mirror of P2454 — signal stuck at the top of its range: an open circuit, short to voltage, or failed sensor.
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Check the sensor tubes too: a fully blocked tube on one side can pin the differential reading.
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Check connector and wiring, then replace the sensor if the circuit is sound.
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Meaning corroborated against this site's independently researched diesel-family pages for the same code (Isuzu, Kubota (2 families, sequence-corroborated with P2453/P2454/P2456)).
Common Fixes by Vehicle
What techs usually find when diagnosing P2455 on specific vehicles — tap your vehicle for the fix and the exact part:
2008-2016 VW/Audi 2.0L TDI moderate DIY
P2455 = DPF differential pressure HIGH -- sensor reading excessive pressure. Either the DPF is actually clogged (needs regen or replacement), OR a sensing line is pinched/plugged. Check DPF soot loading via VCDS measured values first. If loading is >75%, force a service regen. If loading is normal but code is set, replace sensor and/or lines.
Labor: 1-3 hours2007-2010 Dodge Ram 6.7L Cummins moderate DIY
6.7L Cummins P2455 = DPF pressure sensor high. Check DPF soot load first with AlfaOBD or dealer tool. Soot load >75% means the DPF is genuinely clogged -- force a stationary regen, or do an extended highway drive. If soot load is normal, a pinched or contaminated sensing line is giving a false-high reading. Replace lines and sensor.
Labor: 1-3 hours2011-2016 Ford F-250/F-350 6.7L Power Stroke moderate DIY
6.7L PSD P2455 = DPF pressure high. Run FORScan or IDS to check DPF differential pressure and soot load. If soot load is high (over 100g), DPF needs a deep service regen or cleaning. If soot load is normal, replace the DPF pressure sensor and inspect the pressure tubes for blockage.
Labor: 1-3 hoursFrequently Asked Questions
Is this the same fix as P2454?
Nearly — same sensor, same wiring, opposite electrical direction. The additional check for the high variant is a blocked pressure tube, which can pin the differential reading high even with a healthy sensor.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P2455 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
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