New Holland DCU 19604 – DCU (Dosing Control Unit): CAN receive frame ET1 (Oil and Water temp engine) | SAE J1939 Check for CAN receive signal : (Oil temperature not in range) | P0600 Serial Communication Link.

This code indicates a communication or sensor data error on the SAE J1939 CAN bus network. Specifically, the Dosing Control Unit (DCU) is receiving an invalid or "out of range" engine oil temperature signal from the Engine Control Unit (ECU) via the ET1 data frame. The accompanying P0600 code signifies a general Serial Communication Link error, meaning the data packet is either corrupted, missing, or reporting a physically impossible temperature value.

• New Holland T6
• New Holland T7
• New Holland T8
• New Holland T9

1. 1

   Check for accompanying Engine ECU codes (e.g., 3034, 3035, or 3036) which indicate the sensor or its direct wiring is the culprit.

2. 2

   Inspect the engine oil temperature sensor connector and pins for corrosion, moisture, or pushed-out terminals.

3. 3

   Verify that the sensor is receiving its 5V reference voltage from the ECU and test the sensor's internal resistance for an open or shorted condition.

4. 4

   Check the J1939 CAN bus wiring harness between the Engine ECU and the DCU for continuity, chafing, or shorts to ground/power.

1. 1

   Disconnect power

   Turn off the machine and disconnect the negative battery terminal to prevent electrical spikes.

2. 2

   Access the sensor

   Locate the engine oil temperature sensor on the engine block, which is often integrated or located near the oil filter housing or cooler.

3. 3

   Remove the faulty sensor

   Unplug the electrical connector. Using the appropriate deep socket or wrench, carefully unthread the oil temperature sensor. Have a rag ready to catch any residual oil.

4. 4

   Install the new sensor

   Thread the new sensor into the port by hand to prevent cross-threading, then torque it to the manufacturer's specification.

5. 5

   Reconnect wiring

   Plug the electrical connector back in. If the connector was corroded, splice in a new connector repair kit using heat-shrink tubing and dielectric grease.

6. 6

   Clear codes and test

   Reconnect the battery. Use a diagnostic scan tool to clear the DCU 19604 and P0600 codes. Start the engine, let it reach operating temperature, and verify that the oil temperature reads correctly on the dash and that the code does not return.