it means the gear are not shifting,try to accelerate and look at the rev counter and if you can hear the gear shifts if you accelerate.
these can be fixed
(i)thorough flushing of gearbox oil
(ii)checking the + (red) terminal of your battery(do u see any acid leaks)--Change the battery as a bad battery can cause the solenoid to fail
(iii)check the wiring(insecure wiring can cause that)
(iv)Finally solenoid replacement
driving today as usual, not experiencing any problems, and i noticed that the Gear indicator display was flashing - not each letter - the entire thing, P R N D S...
The background would alternate red and black and the letters change, too.
Anyone have any idea what this is indicating? There aren't any other indicator lights on and the system check is normal.
Appreciate any help.
most likely you drove in a place with water and it splashed on the range control switch connector under the car, it probably will happen again check the connector and make sure is insulated is under the car on the left front side of the transmission