This complaint is becoming quite popular. New style top loaders are computer controlled and make an attempt at self-diagnosis. They do a better job than ranges and ovens.
E51 Rotation Position Sensor Problem on Top Loader
Cabrio Error Readout
Take for instance, the error code list for the popular Whirlpool Duet. These are genuinely helpful and save considerable time.
Sample Duet Error Codes Tech Sheet
Of course you need a tech sheet to understand what they mean. (That's where this Repair Wizard is essential.) All error codes tech sheets can be found in my manual library. Some, such as the cheaper Electrolux models, are hard to interpret and early designs required counting lights and positions. Things are getting better. With patience you can get clues as to what is going on and where to start looking.
Samsung Motor Error E3
You may need to spend a bit of time reading the specific tech sheet for your model and work your way through the logic and get yourself pointed in the right direction.