John Deere 736.05 – PTQ, EPC, PTI, PTP, PTR: Transmission Solenoid Valve Current Too Low / Open Circuit

The transmission control unit has detected an open circuit or insufficient current at the signal input of a transmission solenoid valve, which typically results in the control unit commanding the transmission into Neutral or Park to prevent damage.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6010
• 6110
• 6210
• 6310
• 6410
• 6510
• 6610
• 6810
• 6910
• 7610
• 7710
• 7810
• 7630
• 7730
• 7830
• 7930
• 7720
• 7820
• 7920
• 7185J
• 7195J
• 7205J
• 7210J
• 7225J
• 5085M
• 5095M
• 5095MH
• 5105M
• 5015ML
• 5100M
• 5115ML
• 210L EP Tractor

1. 1

   Inspect Wiring and Connections: Visually inspect the wiring harness and connectors leading to the specific transmission solenoid (e.g., K1/Y40, Reverse Brake, or C3) for signs of physical damage, chafing, loose connections, or corrosion.

2. 2

   Check for Open Circuits: Use a digital multimeter to check for open circuits or high resistance in the wiring harness between the transmission control module and the solenoid valve.

3. 3

   Verify Electrical Supply: Ensure that the electrical supply voltage to the solenoid is within the correct OEM specification range. Check for any blown fuses (such as fuse F9 on 7000-series tractors) or power source issues.

4. 4

   Test Solenoid Function: Use a multimeter to measure the internal resistance of the solenoid coil to see if it has failed open, or use John Deere diagnostic software to command the solenoid and test its functionality.

1. 1

   Secure the Machine

   Park the tractor on a level surface, engage the parking brake, shut off the engine, and remove the key.

2. 2

   Locate the Solenoid

   Consult the specific machine's technical manual to locate the affected solenoid on the transmission valve body (e.g., K1/Y40 gear selector solenoid, Reverse Brake solenoid, or C3 clutch solenoid).

3. 3

   Disconnect the Harness

   Carefully unplug the electrical connector from the solenoid valve.

4. 4

   Clean and Repair Wiring

   If corrosion or a broken wire was found during diagnostics, clean the connector pins with contact cleaner or repair the broken wire in the harness.

5. 5

   Replace the Solenoid

   If the solenoid coil tested open or shorted, remove the retaining hardware securing the solenoid to the transmission valve block. Extract the old solenoid.

6. 6

   Install the New Part

   Lubricate the O-rings on the new solenoid with clean transmission fluid. Insert the new solenoid into the valve block and torque the retaining hardware to OEM specifications.

7. 7

   Reconnect

   Plug the electrical harness back into the new solenoid, ensuring the connector clicks and locks securely.

8. 8

   Clear Codes and Test

   Turn the key on, clear the 000736.05 fault code from the control unit, and start the tractor. Perform a test drive, shifting through the gears to ensure the transmission operates smoothly and the code does not return.