John Deere 002019.09 – PTQ: PTQ CAN BUS Communication Fault

Fault code 002019.09 indicates a CAN bus communication error, but its specific meaning depends on the reporting module. When logged by the Instrument Control Unit (ICU), it means the Suspended Seat Unit (SSU) is offline and its messages are missing, typically due to a loss of unswitched power or harness damage. When logged by the PowrQuad™ Transmission Controller (PTQ), it indicates an incorrect CAN bus message regarding wheel speed information, pointing to a broader network communication issue rather than a specific component failure.

• 6110
• 6210
• 6310
• 6410
• 6510
• 6610
• 6810
• 6910
• 6320
• 6420
• 7720
• 7820
• 7920

1. 1

   Scan all vehicle controllers for other active fault codes to determine if multiple modules are logging communication faults, indicating a network-wide problem.

2. 2

   Check fuses (such as F9) for the PTQ, ECU, SSU, and radar controllers to ensure no modules have lost power.

3. 3

   Using a multimeter, verify that the PTQ controller and the sending module (e.g., ECU, SSU) have clean and stable power and ground at their main connectors.

4. 4

   Visually inspect the CAN bus wiring harness between the PTQ and the wheel speed message source for physical damage, chafing, pinching, breaks, or corrosion.

5. 5

   With the battery disconnected, measure the resistance across the CAN High and CAN Low wires at the 9-pin diagnostic connector (pins C and D). A healthy network should read approximately 60 Ohms (120 Ohms indicates an open circuit or missing resistor, near 0 Ohms indicates a short).

1. 1

   Address All Active Codes

   Diagnose and clear any other active fault codes first, especially those related to power supply or other controllers.

2. 2

   Isolate the Missing Module

   Determine which module (ECU, radar, or SSU/BCU) is offline and failing to send the wheel speed information.

3. 3

   Perform Diagnostic Checks

   Follow the diagnostic checks listed above to isolate the root cause of the communication failure.

4. 4

   Repair Wiring

   If a wiring issue is discovered (corrosion, broken wire, short), repair the affected section of the harness. Ensure all connections are clean and secure.

5. 5

   Replace Fuse

   If a blown fuse is found, replace it. If it blows again, diagnose the underlying short circuit causing the overcurrent condition.

6. 6

   Replace Faulty Module

   If all wiring, power, and ground connections are confirmed to be good, use dealer-level diagnostic tools to determine which module is not communicating. Replace the module if it is internally faulty.