Northstar,
Hope you have the lift repaired by now. If not here are some things that may help. The first code 2000-12 is a communication error. You will need to check all connectors on the lift here you have done repairs. A loose connections, connector not locked or possible wire in a connector is not locked and being pushed out. This could even be a bad ECM or other electrical device. The other code, 97-3 does not show up. 96-3 is fuel level sensor issue. Good Luck
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