I’m assuming your Viper is a Gen 1 - not sure if this works for other Vipers.
If it’s a Gen 1 - use the security remote - if you still have it - set in locked position then unlock it - you may need to do this 2 or 3 times - I have this happen every time my battery runs down or I replace the battery - I don’t why but it somehow goes into lock mode. The other problem you will see in security lock mode is the car will crank, start, then die within less than a minute
The only solution I’ve found is to do what I’ve described above.
Does anyone know how to permanently disable the security system?