DPF Differential Pressure Sensor Rationality Error

What this code means

The DPF differential pressure sensor readings do not correlate with expected values based on engine load, exhaust flow, and DPF soot loading model.

Symptoms

• Check Engine Light
• Incorrect regen intervals
• Unnecessary forced regenerations
• DPF may be over-cleaned or under-cleaned
• Fuel economy affected by incorrect regen timing

Common causes

• Differential pressure sensor drift
• Pressure sensor hoses kinked or blocked
• Moisture in pressure sensor lines
• Sensor calibration error
• Soot model and sensor disagreement

Diagnostic steps

1. Compare DPF differential pressure to expected values
2. Inspect pressure sensor hoses for kinks or soot blockage
3. Blow out pressure sensor hoses
4. Test sensor zero-point calibration
5. Compare soot loading model to pressure readings

Repair notes

Replace differential pressure sensor or clean hose connections. Recalibrate DPF soot loading model after repair.

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