Massey Ferguson T220 – TRANS or TRANS2: Issue With Message On CAN BUS From Armrest Gear Shift Signal

The transmission controller is failing to receive a valid communication signal over the CAN bus network from the gear shift lever/switch located on the operator's armrest.

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624
• 5600 Series
• 7600 Series
• 7617
• 8600 Series

1. 1

   Check for related CAN codes (such as T227 or D149) to rule out broader network-wide wiring problems.

2. 2

   Inspect the wiring harness routing from the armrest gear shift lever to the transmission controller for pinched wires, chafing, or loose connector pins.

3. 3

   Test the power supply to ensure the transmission module and armrest are receiving adequate voltage (code T230 indicates low supply voltage).

4. 4

   Test the armrest shift switch for physical damage or internal shorting.

1. 1

   Disconnect Power

   Turn off the ignition and disconnect the negative battery terminal before working on the CAN bus or transmission electronics.

2. 2

   Clean Connections

   Disconnect the harness at the armrest gear shift switch and the transmission ECU. Use electrical contact cleaner to remove any dirt or corrosion, and ensure the pins are seated tightly.

3. 3

   Repair Wiring

   If any breaks or shorts are found in the CAN bus wiring between the armrest and the TRANS module, splice and repair the wires using appropriate heat-shrink connectors.

4. 4

   Replace the Switch

   If the wiring is intact and the CAN bus is otherwise healthy, the internal components of the armrest gear shift switch have likely failed. Remove the armrest trim, unbolt the defective switch, and install the replacement part.

5. 5

   Reassemble and Clear Codes

   Reconnect the battery, turn on the ignition, and use a diagnostic tool to clear the T220 fault code. Test the PowerShuttle forward/reverse and gear shift functions to confirm the repair.