GPM 521929.18 – INFORMATION FOR OPERATOR: Gear 7 Cannot Be Engaged

GPM 521929.18 (GPM )

Code: 521929.18



This code informs the operator that the second attempt to engage Gear 7 has failed. In its active state, this fault also generates the diagnostic trouble code for time-out when engaging the gear. The operator needs to attempt to engage Gear 7 again.


The control software will disable Gear 7, resulting in limited or no functionality of the transmission, which may significantly impact the equipment’s performance.


  • Operator Action:
    • Follow the on-screen instructions to attempt re-engagement of Gear 7.
  • Inspect Transmission:
    • Conduct a thorough inspection of the transmission to identify any mechanical issues preventing Gear 7 from engaging. Look for signs of wear, damage, or misalignment.
  • Check Solenoid Function:
    • Verify that the Gear 7 solenoid is functioning correctly. Replace the solenoid if necessary.
  • Software Update:
    • Ensure the control software is updated and functioning correctly. Install any available updates to address potential bugs or issues.
  • Consult Technical Support:
    • If the issue persists after performing the above checks, consult technical support or the manufacturer for further assistance and potential repairs.


Addressing mechanical and software issues promptly and maintaining the transmission system can help prevent gear engagement problems and ensure reliable operation of the equipment. Regular maintenance and inspection are crucial for long-term performance.

Control Units: John Deere

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