ummm buttered toast
Fault 331 is the traction encoder
the little sensor on top of the brakes on the drive motor
most common cause is a broken wire at the plug connector
very hard to see the broken wire, i have had many techs guarantee the wires are ok, yet when i go out the wire is broken
anyway back to your problem, fault 331 will not disable hydraulics, will only disable drive
check last several fault codes as you may have multiple faults or have lost your 5 volt rail
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