John Deere 3597.06 – PL3 Control Unit: Output for Driver, Current Too High / 12 Volt Supply High AMPS, Range Module Direct Drive

The control unit detects an excessive current draw (high amps) at the driver output for the transmission range shifting module. This typically indicates a short to ground in the wiring harness, a shorted transmission solenoid, or an internal failure within the control unit itself. The driver outputs are automatically switched off to prevent electrical damage, resulting in a loss of range shifting capabilities.

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6105R
• 6115R
• 6125R
• 6135R
• 6140R
• 6150R
• 6155RH
• 6170R
• 6190R
• 6210R

1. 1

   Inspect the wiring harness running from the PL3 control unit to the DirectDrive range transmission module for chafed wires, melted insulation, or pinched lines that could cause a short to ground.

2. 2

   Disconnect the harness at the PL3 module and at the transmission solenoids to inspect the pins for corrosion, moisture, or arcing.

3. 3

   Test the resistance (Ohms) of the DirectDrive range shifting solenoids using a multimeter. A reading of zero or near-zero indicates an internally shorted solenoid coil.

4. 4

   Measure the supply voltage to the PL3 module to ensure the alternator/voltage regulator is not overcharging the system, which can trigger high-current safety shutoffs.

1. 1

   Disconnect Power

   Always disconnect the negative battery terminal before servicing transmission electronics or control modules.

2. 2

   Repair Wiring

   If a short to ground is found in the harness, repair the damaged section using OEM-approved waterproof splices, or replace the affected harness section.

3. 3

   Replace Faulty Solenoids

   If a transmission range solenoid fails the resistance test, remove the retaining bolts/clips on the DirectDrive transmission valve body, extract the shorted solenoid, and install a new one. Lubricate the new solenoid O-rings with clean hydraulic/transmission fluid prior to installation.

4. 4

   Replace the PL3 Module

   If the wiring and solenoids test perfectly, the PL3 control unit itself has likely suffered an internal short. Remove the mounting hardware, disconnect the multi-pin connectors, and install a new PL3 module.

5. 5

   Software Update & Calibration

   If the PL3 module is replaced, it must be flashed with the latest control software via John Deere Service ADVISOR. You may also need to perform a transmission calibration procedure so the new module can learn the clutch and range engagement points.

6. 6

   Clear Codes

   Reconnect the battery, clear the 003597.06 fault code, and test-drive the tractor through all DirectDrive ranges (A, B, and C) to verify the repair.