Try grounding the light blue wire on the tranny connector.
See if it still says you are in 4th gear via Direct Scan.
Best done near the ECM area, Pin C8 should be the light blue wire.
A needle or sharp meter probe tied to ground will work fine.
Could be in the tranny so check the pin or socket that that blue wire goes into in the tranny.
Should be grounded when NOT in 4th gear.