John Deere 000735.05 – PTQ / PTP: Transmission Solenoid Circuit Low Current

The Powertrain Torque (PTQ) or Powershift Transmission (PTP) control unit has detected that the current in a specific transmission solenoid circuit is below the normal operating range. This low current condition can be caused by a faulty solenoid coil, a poor electrical connection, or a damaged wire. It affects components like the High Clutch Solenoid, Clutch C2 Solenoid, or Rear control valve, which are crucial for engaging and disengaging clutch packs to ensure smooth gear changes.

• 5R Series
• 5M Series
• 6R Series
• 6M Series
• 7R Series
• 8R Series
• 8RT Series
• 9R Series
• 9RT Series
• 9RX Series

1. 1

   Review the tractor's diagnostic trouble code history for other related active codes to help narrow down the source.

2. 2

   Inspect transmission and hydraulic fluid levels and condition, as low or contaminated fluid can cause various transmission issues.

3. 3

   Carefully visually inspect the wiring harness and connectors leading to the transmission solenoids for chafing, corrosion, or loose connections.

4. 4

   Perform a solenoid resistance test by disconnecting the electrical connector and measuring resistance across the terminals with a multimeter (typically 5 to 30 ohms). An open circuit or out-of-spec reading indicates a faulty solenoid.

5. 5

   Perform a solenoid activation 'click test' by briefly applying a 12-volt power source to the solenoid's terminals. A distinct click indicates mechanical actuation; no click suggests it is stuck or failed internally.

1. 1

   Isolate the fault

   Based on the diagnostic checks, determine if the root cause lies with the solenoid itself, the wiring harness, or the connector.

2. 2

   Repair wiring or connectors

   If the wiring or a connector is found to be damaged, repair or replace it as necessary. Ensure all connections are clean and secure.

3. 3

   Replace the faulty solenoid

   Drain the transmission oil to a level below the solenoid's location. Disconnect the electrical connector, unscrew and remove the old solenoid. Install the new solenoid, ensuring it is properly seated and torqued to the manufacturer's specifications, then reconnect the wiring.

4. 4

   Refill fluid and calibrate

   Refill the transmission with the correct type and amount of hydraulic fluid. Perform a transmission calibration procedure according to the instructions in the operator's manual.

5. 5

   Clear codes and test

   Clear the fault codes from the control unit's memory and operate the tractor to ensure the issue has been completely resolved.