Case IH 2382 – Transmission Control Module (TCU): 5th shaft speed sensor short to ground

The control module has detected a short circuit to earth (ground) on the signal circuit of the 5th shaft speed sensor. The signal voltage has dropped to zero or an abnormally low level, which is typically caused by the sensor's wiring harness rubbing against the chassis and shorting out, or an internal failure/short within the sensor itself. When this sensor fails, the transmission may go into a forced neutral state or lose specific gears associated with the 5th shaft forward clutch.

• Steiger T4B
• Case IH Steiger Series: 350, 385, 400, 450, 500, 550, 600
• Case IH Quadtrac / Rowtrac Series: 350, 400, 450, 500, 550, 600
• Case IH Magnum Series: 235 through 340 (Series 4)
• Case IH Puma Series

1. 1

   Visually inspect the transmission wiring harness leading to the 5th shaft speed sensor for any signs of chafing, melting, or breaks that could cause a short to the tractor's chassis.

2. 2

   Perform a harness voltage check: Turn the ignition switch to the ON position. Disconnect the harness from the speed sensor. Use a multi-meter to check for voltage from the harness side of the connector (Pin 1 / Cavity A) to chassis ground. You should read a 5.0V reference voltage. If it reads 0V or indicates a short to ground, the wiring harness is damaged and must be repaired.

3. 3

   Perform a sensor resistance test: With the sensor disconnected, measure the internal resistance of the sensor across its pins (Cavity A and Cavity B). The resistance should measure between 2700 to 3300 ohms at 20°C (68°F). If the resistance is outside of this specification (e.g., showing continuity to ground), the sensor has failed internally and must be replaced.

1. 1

   Park the tractor on a level surface, engage the parking brake, and turn the engine off.

   Park the tractor on a level surface, engage the parking brake, and turn the engine off.

2. 2

   Disconnect the negative battery cable to prevent any electrical spikes.

   Disconnect the negative battery cable to prevent any electrical spikes.

3. 3

   Locate the 5th shaft speed sensor on the transmission housing.

   Locate the 5th shaft speed sensor on the transmission housing (refer to the transmission diagram; it is located near the 5th shaft forward clutch assembly).

4. 4

   Clean the area around the sensor thoroughly.

   Clean the area around the sensor thoroughly to prevent dirt or debris from falling into the transmission housing.

5. 5

   Disconnect the electrical connector (C069) from the sensor.

   Disconnect the electrical connector (C069) from the sensor.

6. 6

   Remove the retaining hardware/bolt securing the sensor to the transmission housing.

   Remove the retaining hardware/bolt securing the sensor to the transmission housing.

7. 7

   Carefully pull the sensor out of the housing.

   Carefully pull the sensor out of the housing.

8. 8

   Lubricate the O-ring on the new sensor with clean transmission fluid.

   Lubricate the O-ring on the new sensor with clean transmission fluid.

9. 9

   Insert the new sensor into the housing and tighten the retaining bolt.

   Insert the new sensor into the housing and tighten the retaining bolt.

10. 10

    Reconnect the electrical connector.

    Reconnect the electrical connector, ensuring it is clean and clicks securely into place.

11. 11

    Reconnect the battery.

    Reconnect the battery.

12. 12

    Clear the fault code.

    Connect the Electronic Service Tool (EST) or use the A-post monitor screen to clear the fault code.

13. 13

    Test drive the tractor and monitor the sensor reading.

    Test drive the tractor. Go to the monitor screen, select "INST TRANS OUTPUT SPEED," and monitor the RPMs for all 5 shafts to verify the 5th shaft speed sensor is reading correctly and the code does not return.