Why sometimes when I start my car, my mileage got reset, navi and radio require passcode, etc ? Suggestions ?

 

check battery connections

 

^like Ezra pointed out, maybe the battery connections are loose. a bump would jar the cables loose for a moment and then regain power, causing your stuffs to reset.

 

I have the same issue. Although it happens a lot also when my tires slip (in the snow). Checked battery connections and they're nice and tight..

 

Hey guys. So I have checked the connections, they are tight with no corrosion so I tried to drive it to see will this problem occur, and it still does. This is a new battery from Autozone, I got it since beginning of September of last year, and there weren't any problem until the period when there was a snow storm on the east coast. I thought it was because it was too cold so battery died, but now the weather has gotten warm but this problem still occurs. Any more suggestions ? Thanks.

 

How often does it now occur? Every time the car is started or just random?

 

Had the same issue ,I just changed the battery problem solved

 

I would remove all the large gauge +12V and GND cables and clean everything. Remove them on both ends, not just by the battery. The contact points should be cleaned with a wire brush. When done cleaning, measure the resistance of the cable to make sure it's not damaged. Then apply dielectric grease to every contact point. If it still happens, go to Autozone and tell them they gave you a shit battery and they'll replace it for phree.