The shifter uses two cables to control transmission gear selection. One cable transmits the forward and back movement of the shift lever to the transmission and the other is responsible for the left to right action. It sounds like the cable that controls the left to right movement may have come loose or broken. To inspect the cable connections at the shift lever assembly, you'll need to unbolt it from the floor(cable connections are on the underside). See the attached diagrams for specific information on how to complete this.
Images (Click to enlarge)
Monday, November 4th, 2019 AT 8:14 PM