John Deere 000162.02 – Main Control Module / PowrReverser™ Transmission (PTR) / Steering System Unit (SSU): Transmission Hi/Low Switch Signal or SSU Mismatch

This fault code indicates one of two distinct issues depending on the control module logging it. If logged by the Main Control Module (or PowrReverser Transmission module), it means there is an issue with the signal voltage from the Transmission Hi/Low Switch, pointing to a potential problem with signal integrity or switch operation. If logged by the Steering System Unit (SSU), it indicates a transmission mismatch or missing communication message between the SSU and the transmission controller.

• 7715
• 7815
• 7720
• 7820
• 7920
• 6020
• 6120
• 6220
• 6320
• 6420
• 6420S
• 5045E
• 5055E
• 5065E
• 5075E
• 5085E
• 5090E
• 5090EL
• 5100E
• 5065M
• 5075M
• 5085M
• 5095M
• 5095MH
• 5105M
• 5015ML
• 5100M
• 5100MH
• 5100ML
• 5115ML

1. 1

   Restart the vehicle (SSU communication cause): Restart the tractor to see if communication messages reset and clear the fault.

2. 2

   Check for other diagnostic trouble codes (SSU communication cause): Identify any other active codes that might pinpoint the root cause of the communication error.

3. 3

   Inspect the Transmission Hi/Low Switch (Switch signal cause): Visually inspect the switch for any signs of physical damage or contamination.

4. 4

   Check wiring and connectors (Both causes): Examine the wiring harness and connectors between the switch and the Main Control Module, or between the SSU and transmission controller, for breaks, chafing, corrosion, or loose pins.

5. 5

   Test switch functionality (Switch signal cause): Use a multimeter to test the Transmission Hi/Low Switch for proper operation, checking for correct continuity and voltage signals as the switch is actuated.

1. 1

   Restart tractor

   If diagnosing an SSU communication mismatch, restart the vehicle to attempt to reset communication messages. If the fault clears, no further action may be needed.

2. 2

   Repair wiring or connectors

   If wiring damage, chafing, or corrosion is found between the Hi/Low switch and Main Control Module, or between the SSU and transmission controller, repair or replace the affected harness sections.

3. 3

   Replace Transmission Hi/Low Switch

   If multimeter testing confirms the switch is faulty (Switch signal cause), disconnect the battery, access the switch (typically located on the gear shift lever or operator console), disconnect the electrical connector, and install a new switch.

4. 4

   Contact dealer for SSU diagnostics

   If the fault is logged by the SSU and a restart does not clear it, contact a John Deere dealer. Further diagnostics may require specialized tools to address internal SSU faults or to replace the SSU.