John Deere 000191.02 – PTI / PTP: Transmission Output Speed Mismatch

The transmission control unit has detected a significant mismatch between the speed signal received from the transmission output speed sensor and the expected speed calculated from other vehicle parameters. This discrepancy indicates a sensor failure, wiring fault, or communication error, which can result in erratic shifting, the transmission defaulting to neutral, failure to engage gears, and an inoperable cruise control system.

• 7610
• 7630
• 7700
• 7710
• 7720
• 7730
• 7800
• 7810
• 7815
• 7820
• 7830
• 7920
• 7930
• 8100
• 8100T
• 8110
• 8110T
• 8200
• 8200T
• 8210
• 8210T
• 8300
• 8300T
• 8310
• 8310T
• 8400
• 8400T
• 8410
• 8410T
• 8R
• 8RT
• 6M
• 6R
• 6000
• 6030
• 7010
• 7020
• 7030
• 7M
• 8030
• 8RX

1. 1

   Restart the tractor by cycling the key switch to see if the code clears from a temporary communication glitch

2. 2

   Check transmission and hydraulic oil levels, as low fluid can cause erratic transmission behavior

3. 3

   Visually inspect the wiring harnesses and connectors leading to the wheel speed sensors and the transmission control unit for damage, corrosion, or loose connections

4. 4

   Test the wheel speed sensor resistance with a multimeter (typically 1,000 to 2,000 ohms depending on the sensor type)

5. 5

   Test the wheel speed sensor AC voltage output by rotating the raised wheel; voltage should increase with rotational speed

1. 1

   Confirming the Fault

   Use a diagnostic tool to confirm that 000191.02 is the active fault code.

2. 2

   Performing Diagnostic Checks

   Complete the diagnostic checks listed above.

3. 3

   Isolating the Faulty Component

   If the wiring and fluid levels are good, the issue likely lies with a wheel speed sensor or the control unit itself. Testing the sensors can help determine if one is providing an erratic signal.

4. 4

   Replacing the Faulty Part

   If a wheel speed sensor is identified as faulty, it should be replaced.

5. 5

   Clearing the Fault Code

   After replacement, use a diagnostic tool to clear the fault code.

6. 6

   Verifying the Repair

   Operate the machine to ensure the fault code does not return.