New Holland 2013 – TCM: HI and LO Buttons Pressed Simultaneously

The Transmission Control Module (TCM) has detected that the high (HI) and low (LO) range selector buttons are activated simultaneously for more than half a second. This represents an impossible command for the transmission, which can only be in one range at a time. This condition may interfere with normal gear shifting and requires attention.

• TN Series
• TN75A
• T Series
• T5
• T6
• T7
• TS Series
• TS90
• TS100
• TS110
• TS115
• MXM Series
• TM Series

1. 1

   Confirm if the operator accidentally pressed both buttons at the same time (the error should clear itself once the buttons are released)

2. 2

   Visually and physically inspect the HI and LO buttons to ensure neither is stuck, broken, or jammed in the depressed position

3. 3

   Examine the wiring harness connected to the HI/LO buttons for damage, corrosion, or short circuits (specifically look for a short to a 12-volt source between the switch and the ECM connector)

4. 4

   Use a digital multimeter to test the functionality of the two pushbuttons and check for short circuits in the wiring

1. 1

   Disconnect power

   Ensure the tractor is turned off and the battery is disconnected to prevent electrical damage before beginning any repair.

2. 2

   Access the switch assembly

   Depending on the machine configuration, either disassemble the gear shift knob to access the internal pushbuttons and connections, or remove/open the joystick assembly on the armrest console.

3. 3

   Test or Replace the Switch/Controller

   If a button is confirmed to be faulty, replace the entire gear shift knob or joystick assembly. Disconnect the electrical connector from the faulty component and connect the new one.

4. 4

   Reassemble and test

   Reassemble the components in the reverse order of disassembly. Reconnect the battery, turn the tractor on, and operate the HI and LO buttons to ensure normal function. Clear the stored fault code using a diagnostic tool if necessary.