1994 Plymouth Voyager- changed starter, now van is stuck in limp mode

Hello! I'm new to the forum and this is my first post- happy to be a part of the community.

I recently bought a used 1994 Plymouth Grand Voyager. I'm very happy with the van. The other day I went to start the van, and nothing happened- it clicked, and all the lights and horn were functioning, but it wouldn't turn over. I got under the car and found that the starter was hot, so I went to the auto parts store and bought a new starter. I put it in, and drove it home, and all was well. The next day I got on the highway and discovered that the van would not get out of limp mode- it wouldn't shift into a higher gear and the RPMs were building higher. I got off and took side streets home.

I disconnected the battery for a good while and re-connected it, and things were fine for a short while, but it developed the problem again.

I intend on checking the relays under the hood, checking electrical connections, and getting a trans fluid change soon, but I'm curious... is replacing the starter at all related to the limp mode issue? It was driving fine before that, so I'm confused. Thank you for your help!

Related? Not unless you bumped a wire bundle or such for the tranny. Did you disconnect the battery while changing it?

Thank you for your reply. Yes, I disconnected the battery while changing it.