New Holland T8010 Manual page 1554

Battery voltage is too low for clutch solenoid operation
Cause:
The transmission controller monitors the power supply. If the voltage drops to 9 volts, this fault code will be
recorded and transmission will shift to neutral.
Possible failure modes:
1. Battery voltage low.
2. Alternator regulator malfunction.
3. The controller has a bad connection to power or is not grounded properly.
Solution:
Check for battery voltage, alternator regulator output, and the controller connection to power and ground.
1. Check for fault codes ARM 8011 and AUX/Hitch/PTO 65, 66, 98 and 99. These are all fault codes for battery
voltage low. If most exist, it is more likely that the battery voltage low.
2. Test battery voltage. It should be around 12 - 14 volts.
3. If the battery voltage is Ok, check system voltage at pin 14 of connector C350.
Check for bad connection and improper ground at cavity 19, 23, 25, and 26 of the same connector.
Check for shortage to the ground along the power supply to the controller.
4. Test alternator output if the battery voltage would not hold even when the tractor has been running.
The voltage should be above 14 volts at C077 - B+.
Hot Transmission Oil Temperature
Cause:
The transmission oil temperature above 122 degree C for 2 seconds.
Possible failure modes:
1. Air flow through radiator/oil coolers is blocked.
2. Low coolant level.
Solution:
Clear debris from radiator/oil cooler intake. Check and correct cooling system coolant level.
Section 55 - Electrical System, Controller - Chapter 4
FAULT CODE TRANS 70
FAULT CODE TRANS 72
55-4-27