New Holland DCU 19100 – DCU (Dosing Control Unit): UREA level sensor (electrical) | supply voltage error | Reductant Level Sensor - Circuit Intermittent/Erratic

The Dosing Control Unit (DCU) has detected a malfunction regarding the internal urea (DEF/AdBlue) level sensor. The error is triggered by an unreliable or unstable circuit, specifically a short circuit or an open circuit in the power supply wire inside the NOx neutralization unit or power module.

• New Holland T8.xxx Series (e.g., 8.390, 8.410)

1. 1

   Inspect the wiring harness and all connectors leading to the DCU and the DEF/Urea tank

2. 2

   Check for a short circuit or a broken power supply wire within the NOx neutralization unit's lines

3. 3

   Ensure that all connectors on the DCU are properly seated, pinned correctly, and free of corrosion or moisture

1. 1

   Verify lines and connectors

   Verify that all lines are in working order and that the DCU connectors are securely attached.

2. 2

   Clear fault codes

   Clear the fault codes using a diagnostic tool (such as the CNH Electronic Service Tool or an equivalent scanner).

3. 3

   Cycle key and test

   Cycle the key and operate the machine to see if the code returns.

4. 4

   Replace DCU block

   If the fault code does not clear or if it reoccurs immediately, the internal sensor/circuitry has failed. You must replace the DCU block.

5. 5

   Program new DCU

   Installing a new DCU requires OEM software installation and calibration. CNH requires troubleshooting verification before issuing programming passwords.