John Deere 3719.1 – ECU: Calculated Soot Load Rate of Change Abnormal / The DPF Soot Load Has Increased or Decreased Too Quickly
Issue description
The Engine Control Unit has detected that the calculated Diesel Particulate Filter (DPF) soot load rate is accumulating (or changing) at a rate that is significantly higher than expected. This usually triggers an engine power derate to protect the exhaust aftertreatment system.
Applies to these machines
38 machines- 5085E
- 5090E
- 5090EL
- 5100E
- 5085M
- 5100M
- 5100MH
- 5100ML
- 5115ML
- 5090M
- 5115M
- 6110M
- 6120M
- 6130M
- 6145M
- 6155M
- 6175M
- 6195M
- 6110R
- 6120R
- 6130R
- 6145R
- 6155R
- 6175R
- 6195R
- 6215R
- 5095M
- 5105M
- 6105M
- 8245R
- 8270R
- 8295R
- 8320R
- 8335R
- 8345R
- 9560RT
- 7760 Cotton Picker
- 872GP Motor Grader
Check the cause
Check for accompanying codes, particularly ECU 003251.07 (DPF Differential Pressure Signal Mismatch/Fault) or codes related to exhaust temperatures.
Inspect the DPF Differential Pressure Sensor and its metal tubes/lines for soot blockages, condensation buildup, or cracks.
Check regeneration inhibition factors to ensure there are no active inhibit switches engaged by the operator and that the exhaust system is reaching the required temperatures for regeneration.
Monitor live data using John Deere Service Advisor to observe the DPF soot load and differential pressure during a regeneration cycle. If the pressure drops initially but then suddenly climbs, the sensor is likely failing.
Repair steps
Attempt a Service Regeneration
Initiate a parked/manual DPF Service Regeneration using the John Deere Service Advisor tool or the in-cab display.
Monitor the Sensor
If the regeneration fails to clear the code, or if the differential pressure readings behave erratically (triggering code 003251.07), abort the regeneration.
Replace the Sensor
Disconnect the wiring harness and remove the DPF Differential Pressure Sensor. Clean out the pressure tubes to ensure they are free of soot. Install the new sensor.
Perform a DPF Service Recovery
Using Service Advisor, run a DPF Service Recovery (this can take up to 3 hours depending on soot load).
Perform a Final Service Regeneration
Run one more standard Service Regeneration to reset the soot load parameters in the ECU.
Clear Codes
Reset the ECU and clear all stored codes. Run the machine under load to verify the code does not return.
Parts you might need
(2)DPF Differential Pressure Sensor (Exhaust Pressure Sensor)
The exact John Deere OEM part number varies heavily depending on the specific engine displacement (e.g., 4.5L, 6.8L, 9.0L). You will need to cross-reference the machine's Engine Serial Number (ESN) in the John Deere parts catalog to get the exact sensor part number.
DPF Differential Pressure Sensor Tubes/Lines
Replace only if cracked or heavily clogged with hard carbon that cannot be cleaned.
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