New Holland T8010 Manual page 1603

The engaging of the transmission may cause sudden movement of the tractor. Execute extreme caution
when engaging the tractor to avoid personal damage. Do the test only when the tractor can be moved
safely.
4. Troubleshooting the system pressure sensor and its circuit.
Clear fault codes. Disconnect the sensor at connector C044.
Shorting pin C to pin A at the harness side and run the tractor. This fault code should not reappear.
Shorting pin C to pin B at the harness side and run the tractor. This fault code should reappear.
If above situations are true, replace the pressure sensor. Otherwise, check the wiring
Make sure the 5 V power supply is available from the controller at Pin A of C044.
Make sure there is good continuity between Pin C of C044 and Pin 11 of C351.
Make sure there is good continuity between Pin B of C044 and the clean ground.
NOTE: Pay attention to wiring damage, loose connectors, and bent pins.
Section 55 - Electrical System, Controller - Chapter 4
55-4-76