John Deere 191 – PTR, EPC, PTI, PTQ, or PTA: Main Control Module Has Noted The Transmission Speed Sensor Speed Is Too High During Calibration

The transmission control unit registers a transmission output speed or top shaft speed that exceeds the allowable threshold while a transmission calibration routine is actively being performed.

• 5085E
• 5090E
• 5090EL
• 5100E
• 5045E
• 5055E
• 5065E
• 5075E
• 5065M
• 5075M
• 5085M
• 5100M
• 5100MH
• 5100ML
• 5115ML
• 5095M
• 5095MH
• 5105M
• 5015ML
• 5090M
• 5115M
• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 5225
• 5325
• 5425
• 5525
• 5625
• 5725
• 6230
• 6330
• 6430
• 7185J
• 7205J
• 7720
• 7820
• 7920

1. 1

   Verify the calibration environment: Ensure the tractor is parked on a completely level surface, the parking brake is engaged, and the machine cannot roll during the calibration process (most common cause).

2. 2

   Inspect the transmission speed sensor (B104/B172) on the transmission housing for physical damage, heavy debris, or misalignment.

3. 3

   Check the wiring harness and connections leading to the transmission speed sensor for corrosion, loose connector pins, or chafed wires.

4. 4

   Test the sensor circuitry using a multimeter to check for proper functionality, open circuits, or short circuits.

5. 5

   Check for related diagnostic codes, such as 000191.17 (Transmission Speed Too Low), which often indicates a completely failed sensor or severed wire.

1. 1

   Secure the Machine

   Park the tractor on a flat, level surface. Engage the park brake and turn off the engine.

2. 2

   Access the Sensor

   Locate the transmission speed sensor (B104) on the transmission housing.

3. 3

   Disconnect and Remove

   Unplug the 3-wire harness connector from the sensor. Remove the retaining bolt securing the sensor to the housing and pull the sensor out.

4. 4

   Install the New Sensor

   Lubricate the O-ring on the new sensor with clean transmission fluid. Insert it into the housing and tighten the retaining bolt to factory spec.

5. 5

   Reconnect

   Plug the wiring harness back into the sensor, ensuring the connector clicks and locks into place.

6. 6

   Clear Codes and Recalibrate

   Turn the key on, use the CommandCenter or a diagnostic tool to clear the stored PTR 000191.00 code. Restart the engine and initiate the transmission calibration procedure again, ensuring the tractor remains completely stationary.