Case IH 19597 – DCU (Dosing Control Unit): CAN receive frame EEC1 (Driver demand, eng speed, eng torque) _timeout _P0600 Serial Communication Link

The DCU is failing to receive the EEC1 data frame from the Engine ECU within the expected timeframe, triggering a P0600 Serial Communication Link error.

• Tier 4a
• Case IH Magnum 235
• Case IH Magnum 260
• Case IH Magnum 290
• Case IH Magnum 315
• Case IH Magnum 340
• Case IH Magnum 370
• Case IH Magnum 380
• Case IH Steiger Series (350 to 600 HP)
• Case IH Puma Series (130 to 210)

1. 1

   Test voltage at the DCU (abnormally high voltage indicates a wiring fault, while correct voltage with lost communication points to an internal DCU failure)

2. 2

   Visually inspect the engine wiring harness on the right side of the engine near the fuel filters, CP3 pump, CAM, and crank sensors for chafing against the engine block

3. 3

   Check all relevant connectors between the Engine ECU and the DCU for bent, dislocated, or corroded pins, and ensure they are fully seated

4. 4

   Perform a flex test by gently flexing the wiring harnesses while monitoring the diagnostic display or Electronic Service Tool (EST) to reveal intermittent breaks or shorts

1. 1

   Disconnect Power

   Always disconnect the batteries before servicing the engine wiring harness or control modules to prevent electrical spikes.

2. 2

   Expose the Harness

   If the diagnostic checks point to a wiring short (especially near the CAM/crank sensors or fuel filter), carefully cut back the protective loom to expose the individual wires.

3. 3

   Repair Wiring

   If bare wires are found rubbing together, separate them. Repair the damaged sections by soldering and using heat-shrink tubing, or wrap each individual wire securely with high-quality electrical tape.

4. 4

   Re-loom and Secure

   Tightly wrap the repaired harness in a new protective loom and secure it with zip ties away from vibration points and sharp engine edges to prevent a recurrence.

5. 5

   Replace Harness (If Necessary)

   If the harness is severely degraded, melted, or rodent-damaged, remove the old harness by disconnecting all sensor points and install a new OEM engine wiring harness.

6. 6

   Replace DCU (If Necessary)

   If the wiring tests perfectly intact and the DCU is receiving proper voltage but still failing to communicate on the CAN-bus, the DCU must be replaced. Note: A new DCU requires software installation/flashing via the Case IH Electronic Service Tool (EST) before it will function.

7. 7

   Clear Codes

   Reconnect the batteries, cycle the key, and use a diagnostic tool to clear the 19597 / P0600 fault codes. Test operate the machine under load to ensure the code does not return.