John Deere PTQ524254.04 – PowrQuad™ PLUS, CommandQuad™, AutoQuad™ PLUS (PTQ), or Powershift Transmission (PTP) Control Unit: Transmission Enable Relay Circuit Voltage Low

The AutoPowr™/IVT™ Transmission Control Unit (PTI) has detected a low voltage condition within the circuit that includes the transmission enable relay and its associated switch. This fault indicates a problem with the relay circuit or the switch itself, which can prevent the transmission from engaging or cause it to unexpectedly drop out of gear.

• 7715
• 7815
• 7720
• 7820
• 7920
• 7630
• 7730
• 7830
• 7930
• 9330
• 9430
• 9530
• 9630
• 6020
• 6120
• 6220
• 6320
• 6420

1. 1

   Restart the tractor to determine if the code was triggered by a temporary communication error

2. 2

   Check for a fuse in the F5 location (especially on 7630, 7730, 7830, and 7930 series) - this slot is for 'Come Home' mode and should be empty during normal operation

3. 3

   Inspect the battery and alternator for signs of damage, corrosion, or accumulated debris that could affect electrical performance

4. 4

   Check general fuses F12, F24, and F51 for controller supply voltage issues

5. 5

   Inspect the wiring harness leading to the transmission and the fuse/relay panels for damage, corrosion, or loose connections

1. 1

   Locate the fuse and relay panel

   Find the fuse and relay panel. On 6020 and 6x20 series tractors, this is typically located behind the operator's seat, below the rear window. On 9030 series tractors, the panel is also located behind the operator's seat.

2. 2

   Identify the transmission enable relay

   Locate the specific relay for the transmission. For 6020, 6x20, and some 6x20S tractors, this is explicitly identified as being in relay box K09, position 5 (K09/5).

3. 3

   Test and replace the relay

   Test the transmission enable relay for proper function. If it is found to be faulty, replace it with a new 12V sealed relay.

4. 4

   Inspect and repair wiring

   If replacing the relay does not resolve the issue, trace the wires from the transmission control unit to the relay, and from the relay to the transmission. Repair any damaged wires or corroded connectors.

5. 5

   Contact dealer for advanced diagnosis

   If the code persists after checking the relay and wiring, contact a certified John Deere technician, as further diagnosis may require specialized tools.