John Deere 2003.09 – TIQ: CAN Bus Communication Error

A control module on the machine's CAN network is experiencing intermittent or completely non-existent reception of data messages from the Transmission Control Unit (TCU) or Electrically Powered Control (EPC) within the expected timeout period.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6090MC
• 6100MC
• 6110MC
• 6090RC
• 6100RC
• 6110RC
• 7720
• 7820
• 7920
• 9230
• 9330
• 9430
• 9530
• 9630
• 210L EP Tractors

1. 1

   Perform a power cycle by restarting the vehicle or cycling the key switch to rule out a temporary voltage drop or software glitch

2. 2

   Inspect fuses associated with the transmission control and CAN communication (specifically Fuse F6, F13, F24, or F35 depending on transmission type)

3. 3

   Check the CAN Bus wiring harness between the TIQ, PTQ, and other modules for loose pins, corrosion, or physical damage

4. 4

   Perform a network integrity test using a diagnostic tool to verify if the transmission controller is broadcasting messages

5. 5

   Ensure there is no external electromagnetic interference disrupting the CAN Bus signals and verify that the CAN cables are properly grounded and shielded

1. 1

   Safely secure the machine

   Park the tractor, engage the parking brake, and turn off the engine.

2. 2

   Check and replace fuses

   Locate the fuse panel and test the transmission/communication fuses (F6, F13, F24, F35). Replace any blown fuses with the exact same amperage rating.

3. 3

   Test the system

   Restart the tractor. If the code returns, proceed to the wiring harness.

4. 4

   Inspect connectors

   Locate the TIQ module and the main Transmission Control Unit (PTQ/TCU). Disconnect their wiring harnesses. Inspect the terminals for pushed-back pins, moisture, or corrosion. Clean with electrical contact cleaner, apply dielectric grease, and securely reconnect.

5. 5

   Test CAN continuity

   Using a multimeter, perform a continuity test on the CAN High and CAN Low wires between the modules. Repair or replace any damaged sections of the wiring harness.

6. 6

   Software Update

   If the wiring is intact, the issue may be a software conflict. Ensure that the TIQ and transmission control software are updated to the latest versions (this requires dealer-level software).

7. 7

   Module Replacement

   If all wiring, power, and grounds are verified but communication remains dead, the transmitting module (PTQ/TCU) or the receiving module (TIQ) has likely suffered an internal hardware failure and must be replaced and calibrated by a dealer.