Depending on the length of time the power was interrupted, your system may require GPS initialization.

If initialization is not necessary, the system proceeds directly to the Startup Confirmation screen.
If the system fails to locate a sufficient number of satellites to locate your position within 10 minutes, the following screen is displayed.

If you are experiencing GPS reception problems:
Avoiding Streets
DEST button (when en route)
►Avoid Streets
Select a street or streets along your route to avoid.
1. Select the street you want to avoid.
► Repeat the procedure to avoid
other ...
Emissions Testing
Testing of Readiness Codes
Your vehicle uses “readiness codes,” as part of its onboard self diagnostic
system.
Some states refer to these codes during testing to see if your vehicle’s
em ...
Fuel Line Inspection
Check the fuel system lines and hoses for damage, leaks, and deterioration.
Replace any damaged parts.
Check all clamps, and make sure they are properly positioned and tightened.
...