John Deere 002003.09 – ICU / ICC: PTI or PTQ Message Missing

The Instrument Control Unit (ICU) or Armrest Control Unit (ACU) has lost communication with the Powertrain Control Unit (PTI/PTQ or TCU) over the CAN bus network. The .09 suffix indicates an abnormal update rate, meaning the expected signal from the transmission controller is missing. While the dash may display a generic 'Repair at Earliest Convenience' message, the underlying issue is a communication breakdown that can be caused by blown fuses, poor grounds, damaged CAN wiring, or a faulty control unit.

• 3033r
• 4044m
• 5075E
• 7720
• 7820
• 7920
• 7630
• 7730
• 7830
• 7930
• 7810
• 8130
• 8230
• 8330
• 8430
• 8530
• 9230
• 9330
• 9430
• 9530
• 9630
• 750C
• 850C
• 550K
• 650K

1. 1

   Restart the tractor to see if the communication error is a temporary glitch

2. 2

   Check the transmission controller power fuses (e.g., F6 for 7000/8000 IVT/AutoPowr, F35 for PowrQuad Plus, or F9/F24 depending on model)

3. 3

   Inspect battery terminals and main frame ground connections for corrosion and tightness

4. 4

   Perform a CAN bus resistance test at the 9-pin diagnostic connector (measure resistance between Pin C and Pin D; expected is 60 Ohms)

5. 5

   Visually inspect the wiring harness between the ICU and the transmission controller for rodent damage, chafing, or corrosion

1. 1

   Replace blown fuse

   If a blown fuse is found, replace it with one of the same rating. If it blows immediately, trace the power wire to the transmission controller to locate and repair a short circuit.

2. 2

   Repair battery and ground connections

   Disconnect loose or corroded connections, clean thoroughly with a wire brush until shiny metal is exposed, and securely retighten.

3. 3

   Repair CAN bus wiring or terminators

   If resistance is 120 Ohms, locate and replace the missing or faulty 120-Ohm terminating resistor. If resistance is 0 Ohms or open-loop, repair broken wires, shorts, or replace corroded connectors in the harness.

4. 4

   Replace transmission controller

   If all fuses, wiring, and CAN bus resistance checks pass, the transmission controller (PTI/PTQ) has likely failed internally and must be replaced.