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It's most likely a bad governor pressure transducer but in order to determine that you will need a scantool.
If it will give you the governor pressure then monitor it when you have it in drive. The pressure should be 0 with foot on brake and in drive. If it's anything over 0 then it will need to be replaced and anytime I replace the governor pressure transducer I also replace the governor pressure solenoid because they work hand in hand. I attached the location of them. To replace them all you will need to do is drop the pan and then remove them using a Torx and a 7/16..
Glad I could help,