New Holland TRANS 136 – Transmission Controller (TRANS): Communication lost with the instrumentation controller

The CAN Bus communication link between the transmission controller and the instrumentation controller has been interrupted or lost.

• TG210
• TG215
• TG230
• TG245
• TG255
• TG285
• T8030
• T8040
• TJ280-TJ530
• T9010-T9060
• T6010-T6070
• T70 series
• MXM / TM Series
• Magnum 235-340
• MX Magnum

1. 1

   Verify both the transmission controller and the instrumentation controller are powering up and functioning correctly

2. 2

   Inspect the CAN Bus wiring harness that runs between the transmission controller and the instrumentation controller

3. 3

   Look for bad CAN Bus connections, such as corroded pins, loose terminals, or moisture intrusion at the controller harness plugs

4. 4

   Ensure the tractor model configuration is set correctly in the instrumentation controller (ST MODEL parameters)

1. 1

   Access the Controllers

   Locate the Transmission Controller and the Instrumentation Controller (ICU2) on your specific tractor model.

2. 2

   Harness Inspection & Repair

   Disconnect the wiring harnesses from both controllers. Use a multimeter to check for continuity, shorts to ground, or shorts to power on the CAN Bus lines between the two modules.

3. 3

   Clean Connections

   Clean the mating pins and connectors thoroughly. Reconnect the harnesses and ensure they are seated and locked properly.

4. 4

   Test Voltage/Ground

   Verify that the instrumentation controller is receiving proper operating voltage (e.g., 8V or 12V depending on the pinout) and has a solid ground.

5. 5

   Replace Faulty Component

   If the wiring harness tests perfectly but communication cannot be established, one of the controllers has suffered an internal failure. Replace the faulty controller (usually the Instrumentation Controller if it fails to output reference voltages, or the Transmission Controller if it fails to send/receive data).

6. 6

   Recalibrate/Configure

   If a controller is replaced, use the electronic service tool to configure the new controller to the correct tractor model and clear the stored TRANS 136 fault code.