Rick,
Anything electronic can go bad.
A few suggestions:
1) Even if you think your battery is good, and is showing sufficient voltage, fully charge and
load test your battery, and double check the connections to it.
2) Make sure you are running the latest software for your unit.
3)Call Humminbird customer service (1-800-633-1468), they will know what that code means,
and may have suggestions for you.
Hopefully your unit is under warranty.
Good Luck,