Basically, when the dash display boots up it does not see any data stream from the motor controller.
Most of the time it is a loose connection.
- Check/clean the 23p connection on top of the controller or the connectors on the PSDM
Sometimes the controller is not booting up.
- check the fuses
- Possible dead controller
Once it was due to the controller sitting across the room on a bench.
- install controller into car
Review what led up to when this started happening.
Is the car still working?