John Deere 168.02 – Transmission Module IVT (PTA) / Transmission Control Unit (TCU): Internal Transmission Power Supply (VPS) / (VPS1), Incorrect

The control unit detects a plausibility problem at the internal transmission power supply inputs (VPS), indicating an open circuit, a short to a positive lead, or a short to ground in the transmission wiring harness (specifically leads 6052 and/or 9008).

• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6230
• 6330
• 6430

1. 1

   Inspect the Power Supply Circuit: Check for an open circuit and ensure all connections to the transmission module are secure.

2. 2

   Check for Shorts: Carefully examine the wiring harness, specifically isolating leads 6052 and 9008, looking for any signs of shorting to a positive lead or to ground.

3. 3

   Test Voltage Levels: Use a multimeter to measure the voltage levels directly at the VPS inputs on the PTA/TCU module to verify what voltage the controller is actually receiving.

4. 4

   Examine Connectors: Inspect all wiring and connectors associated with the VPS for physical damage, corrosion, or pin push-out.

5. 5

   Check Module Functionality: Ensure the PTA control unit is processing signals properly. Check if there is a pending software update for the transmission module that addresses voltage plausibility logic.

1. 1

   Repair Wiring

   If leads 6052 or 9008 are damaged, shorted, or open, repair the wiring harness or replace the damaged connector pins.

2. 2

   Restore Voltage

   Repair or replace any upstream electrical components (relays, fuses, or power distribution nodes) that are providing incorrect voltage to the VPS inputs.

3. 3

   Update Software

   If the physical circuit tests perfectly but the code persists, flash/update the PTA/TCU software to the latest version via John Deere Service Advisor.

4. 4

   Replace the Module

   If the wiring is intact, the correct voltage is reaching the module, and the software is up to date, the internal power supply processing of the PTA module has failed. The Transmission Control Unit must be replaced and calibrated.