DPF Pressure Sensor Circuit Low
The P2455 code means the vehicle's onboard diagnostic system has detected: DPF Pressure Sensor Circuit Low. 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 on
- Reduced engine power
- DPF regeneration issues
- Increased fuel consumption during regen
Probable Causes (Ranked by Likelihood)
- Short to ground in DPF sensor circuit Very High
- Heat damage to sensor wiring High
- Soot contamination on sensor Moderate
- ECM sensor input fault Low
Step-by-Step Diagnostic Procedure
-
Read DPF sensor data on scan tool
-
Inspect sensor wiring for heat damage
-
Measure sensor resistance
-
Compare sensor reading to expected values
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
What does P2455 mean?
P2455 indicates: DPF Pressure Sensor Circuit Low. The ECM detected an issue that needs diagnosis and repair.
Is P2455 urgent?
DPF and exhaust-related codes should be addressed promptly to prevent further damage to expensive components like the DPF and catalytic converter.
What should I check first?
Start with a visual inspection of the sensor wiring and connector. Use a scan tool to read live data. For DPF codes, check soot loading level. For EVAP codes, check the gas cap first.
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:
See All Codes & Fixes for Your Vehicle
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