PROBABLE CAUSES:
1. DPF outlet pressure sensor.
2. DPF outlet pressure sensor harness/connector.
3. Check all connections upstream to the MCM (ATD 10-pin connector, vehicle interface module 31-pin connector, MCM 120-pin connector).
4. Emission defeat device installed on vehicle.
5. DPF outlet pressure hose assy.
6. DPF inlet pressure hose assy.
7. Stationary regen.
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