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I have 1997 New Holland 6640. what does error code E54 mean?

What does error coe E54 mean? I have 1997 New Holland 6640 cab tractor.
steven, October 2010
Code E54 5 volt reference voltaged shorted to ground (12x12 dual power SL tractor). Look at the clutch potentiometer and wiring for damage or failed pot. Middle wire in harness plug is the ref voltage wire.

Ash, December 2010
what's it not doing

scrapman, October 2010
link Click here to see other fixes for New Holland.