My /!\ dash light stays on and just noticed my reverse lights won't come on either. Could no reverse lights trigger a solid /!\ dash light? Btw, the dash light stays on all the time not only when I shift to reverse.
If your reverse bulbs are out, it would trigger the dashboard alarm. It stays on until it is cleared from the ecu even if you replace the bulbs and they work find afterwards. Usually, people resort to just disconnecting the battery after fixing whatever caused the alarm (in your case the bad bulbs, assuming that what it is).