John Deere 521933.18 – GPM: INFORMATION FOR OPERATOR: Gear 4 Cannot Be Engaged.

This code informs the operator that the second attempt to engage Gear 4 has failed. When active, this fault also generates a corresponding diagnostic trouble code for a time-out when engaging the gear. As a reaction, the control software will disable Gear 4, which results in limited or no functionality of the transmission.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6140R
• 6150R
• 6170R
• 6190R
• 6210R
• 6R 145
• 6R 215

1. 1

   Follow the on-screen instructions to attempt re-engagement of Gear 4.

2. 2

   Conduct a thorough visual and mechanical inspection of the transmission system to identify any mechanical issues preventing Gear 4 from engaging. Look for signs of wear, damage, or misalignment.

3. 3

   Verify that the Gear 4 solenoid is functioning correctly and responding promptly. (Note: Related codes like 521933.05 or 521933.06 indicate solenoid current being too low or too high, which points to open or short circuits in the wiring).

4. 4

   Verify that the GPM control software is up-to-date and functioning correctly.

1. 1

   Attempt Re-engagement

   Clear the code and attempt to engage Gear 4 again to see if it was a temporary software time-out.

2. 2

   Update Software

   Install any available software updates to the GPM to address potential bugs or known issues.

3. 3

   Test and Replace Solenoid

   If the software is up-to-date and the gear still will not engage, test the Gear 4 solenoid. If the solenoid is faulty, unresponsive, or has internal circuit issues, replace the solenoid.

4. 4

   Mechanical Repair

   If the solenoid and software are functioning properly, the transmission must be disassembled or inspected internally for mechanical binding, wear, or damage preventing the gear from physically engaging.

5. 5

   Monitor Performance

   After making necessary adjustments or replacing parts, monitor the performance of Gear 4 engagement to ensure the issue is fully resolved. If the issue persists, consult John Deere technical support.