Massey Ferguson 04.03.05 – TRANS: Transmission High Pressure Sensor 2 Signal Voltage Issue

The control module is receiving an electrical signal from the Transmission High Pressure Sensor 2 that falls outside the expected voltage parameters (either too high, too low, or erratic). This condition typically points to a failed sensor, a wiring harness issue (such as a short or open circuit), or a poor electrical connection.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 6600
• 7600
• 8600

1. 1

   Inspect the wiring harness leading to Transmission High Pressure Sensor 2 for any visible damage, chafing, or breaks.

2. 2

   Disconnect the sensor and inspect the connector pins for corrosion, moisture, or bent pins.

3. 3

   Use a multimeter to check the supply voltage (typically a 5V or 8.5V reference depending on the exact transmission model) and ground to the sensor to ensure the wiring is intact.

4. 4

   Test the signal wire for continuity back to the TRANS module.

5. 5

   If the wiring and connections are good and the supply voltage is correct, the sensor itself has likely failed internally and requires replacement.

1. 1

   Ensure the tractor is parked on a level surface with the engine off.

2. 2

   Apply the hand brake or engage the ParkLock.

3. 3

   Locate Transmission High Pressure Sensor 2 on the transmission valve block.

4. 4

   Disconnect the electrical connector from the sensor.

5. 5

   Unthread and remove the faulty pressure sensor.

   Have a shop rag ready to catch any residual transmission fluid.

6. 6

   Install the new OEM transmission high pressure sensor and tighten it to the manufacturer's specified torque.

7. 7

   Reconnect the electrical connector.

8. 8

   Perform a transmission calibration via the tractor terminal or diagnostic tool.

   Preliminary conditions for calibration: a. Hand brake applied or ParkLock engaged. b. Power Control lever in the neutral position. c. High/low speed range (Hare/Tortoise) in neutral.

9. 9

   Clear the 04.03.05 fault code and test drive the tractor to ensure the code does not return.