Massey Ferguson T123 – TRANS: Issue With Signal Voltage From Clutch Pedal Sensor (TRANS)

This code indicates a signal conflict or implausible voltage reading between the clutch pedal potentiometer (sensor) and the Bottom of Clutch (BOC) switch. Specifically, the system logs this code when the clutch pedal potentiometer signal is reading > 0% (indicating the pedal is depressed), but the BOC switch is reading 0 V (indicating the pedal is not fully depressed or the switch circuit is open).

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624
• 7714
• 7715
• 7716
• 7718
• 7719
• 7720
• 7722
• 7724
• 7726

1. 1

   Inspect the pedal box to locate the clutch pedal potentiometer and the Bottom of Clutch (BOC) switch.

2. 2

   Test the BOC switch using a multimeter (most common cause). It should show a clear change in state (typically 0V to 12V/14V) when the pedal is fully depressed.

3. 3

   Verify the voltage sweep of the clutch pedal sensor (potentiometer) using a multimeter or dealer diagnostic software (Wintest). The voltage should increase smoothly without dropouts as the pedal is pressed.

4. 4

   Inspect the wiring harness connecting the pedal sensors to the transmission module for chafing, shorts to ground, or disconnected pins.

1. 1

   Disconnect Power

   Turn off the tractor and disconnect the battery to prevent electrical shorts.

2. 2

   Access the Pedal Box

   Remove the lower dash or pedal box trim panels to access the clutch pedal linkage.

3. 3

   Replace the Faulty Component

   If the BOC switch is faulty (most common), unplug its electrical connector, unthread/unclip the old switch from its mounting bracket, and install the new switch. If the potentiometer is faulty, unbolt it from the pedal pivot linkage, disconnect the harness, and install the replacement sensor.

4. 4

   Reassemble

   Reconnect the wiring harnesses and reinstall the trim panels.

5. 5

   Calibrate the Clutch

   After replacing clutch pedal sensors or switches, you must perform a clutch pedal calibration via the tractor's dashboard screen or diagnostic tool to ensure smooth engagement and clear the fault code.