New Holland T8010 Manual page 1539

BOC switch or Neutral relay short circuit
Cause:
Fault code 48 is recorded when the clutch pedal position is below 5%, shuttle lever is in Forward OR Reverse, and
the controller detected +12V from bottom of clutch relay.
Possible failure mode:
1. Neutral relay stuck closed
2. Bottom of clutch switch stuck closed
3. Wiring shorted to power.
Solution:
1. Replace the Neutral relay (relay #6) with a known good relay. If the fault goes away, it was a relay failure.
Otherwise go to next step.
2. Unplug the Neutral relay. Turn tractor Key on.
There should be constant 12 V to cavity 1 when the clutch pedal position is above 30% and the shuttle lever is
in Forward OR Reverse. The 12 V should disappear when the clutch pedal position is fully depressed or the
shuttle lever is in Neutral OR Park. If the 12 V is constant, go to step 3.
Otherwise, check shortage to power in the wiring between cavity 5 and pin 25 or pin 34 of connector 355.
3. Check the BOC switch and its wiring.
The BOC switch is located under the steering column. Disconnect connector C50. Measure continuity between
Pin A and B on the switch. With inching pedal up, there should be continuity. With inching pedal down, there
should be no continuity. If the switch works OK, check shortage to power in the wiring between the BOC switch
and the cavity 1 of neutral relay.
Pay attention to loose wire or loose terminal to the relay seat.
If there is not a new relay ready available, swap the Neutral relay with other relays for the checks.
Section 55 - Electrical System, Controller - Chapter 4
FAULT CODE TRANS 48
55-4-12