John Deere 524248.31 – Transmission Control Unit: Parking Transmission Fault

The transmission control unit has detected vehicle motion while the park brake is engaged. This means the tractor is moving or its wheels are turning when the gear selector is in the Park position, which poses a significant safety risk.

• 8R Series
• 8225R
• 8245R
• 8270R
• 8295R
• 8320R
• 8345R
• 8000 Series
• 8000T Series
• 8400
• 9000 Series
• 9030 Series
• 9230
• 9330
• 9430
• 9530
• 9630
• 9R Series

1. 1

   Bring the vehicle to a complete stop and cycle the gear selector out of Park and back in (initial operator action)

2. 2

   Check for low transmission/hydraulic oil levels, which can cause brake pressure issues

3. 3

   Inspect wiring harnesses connected to the park switch, transmission range sensor, and transmission control unit for visible damage, corrosion, or loose connections

4. 4

   Test the park switch for proper continuity to ensure it is not sending an incorrect signal

5. 5

   Check the transmission range sensor for faulty operation or dirty contacts that could send a false 'park' signal

6. 6

   Inspect external mechanical shift linkages for a sheared or missing roll pin that could prevent the park pawl from engaging

7. 7

   Check park brake hydraulic pressure and the pressure sensor (on models with hydraulically released park brakes) for low system pressure

1. 1

   Confirm the fault

   After ensuring the vehicle is safely secured, attempt to replicate the fault to confirm it is not an intermittent issue.

2. 2

   Address fluid levels

   Check and top off the transmission/hydraulic oil if necessary.

3. 3

   Repair electrical components

   Replace the park switch if continuity testing fails. Inspect, clean contacts, or replace the transmission range sensor if it is faulty. Repair any damage found in the wiring harnesses and ensure all connections are clean and secure.

4. 4

   Repair external mechanical linkages

   For issues related to the external shift linkage, replace any sheared or missing roll pins.

5. 5

   Inspect and repair internal transmission components

   If the issue is suspected to be internal (broken park pawl, torsion spring, or roller), remove the transmission top cover or rockshaft cover for visual inspection and replace damaged components.

6. 6

   Post-repair verification

   Clear the fault codes and operate the vehicle to ensure the fault does not return. Perform a transmission calibration if necessary.