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Hi, I'm Greg (Indy-Tech).Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.Rgds Greg.
If the dash warning light is showing tail gate open and the gate is 100% closed then you
have a problem with the Locking latch .
This latch has a sensor letting you know if the gate is open or closed .
This has probably malfunctioned causing you this issue .
What i suggest you do is disconnect the negative side of the battery when the car is not in use.
When you want to use reconnect the battery until Monday when you can have this checked.
Need further assistance with this issue then please get back to me with the reply box below .After rating there is no further cost for any other question relating this issue .Kind regards Greg