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Be sure to update the firmware by running the Garmin WebUpdater. Download and Install WebUpdater.
It is not necessary to unplug the vehicle power cable as the unit will shut down automatically if the vehicle power source is not supplying power after the vehicle is turned off. If the vehicle power cable does continue to supply power, then a manual shut down can be done with the power switch on the nuvi but it is still not necessary to disconnect the vehicle power cable.
Perhaps there is an electrical short due to the cold temperature. I would suggest taking it indoors and letting it warm up to room temperature and see if that solves the problem. If not, it also could be a short in the power cord (if not running directly on power at the time), again, due to the cold weather. What was the temperature?
I've had a similar situation with a Magellan, it would power off despite being plugged in.
Its usually a battery issue, perhaps its not getting enough power? You could try to unplug it and do a "hard battery reset" depending on the type of battery. Keep turning it on and let it run out, until it wont even turn on anymore, after that plug it into a charger while off and allow it to charge completely. Turn it on, see if it still shuts off.
If you left your Garmin c330 on running
the battery will have 1% life left. If you turn c330 back on again, it
will flash screen for 3 seconds then die, even charging it at this
point will not wake it back up. TO BRING IT BACK TO LIFE... plug in the
power home or car into Garmin c330. There is a tab in the front Garmin
gray frame of your screen. You must take like your fingernails and
under the logo "GARMIN" pull the whole gray plastic frame off.
Underneath the plastic frame to the right hand side. There is a "RESET"
button. Make sure power is plugged in while hitting reset. Your battery
should come back to life. Cheers
This is telling me that your cigarette lighter socket has +12VDC applied to it all the time EVEN when the ignition is turned OFF. This is not the fault of your Nuvi. On some cars, like Hondas, the cigarette lighter socket powers off when your ignition is turned off.
If you want it to turn off with the ignition, then you will have to power it from a +12VDC source that is controlled by the ignition.
I have run into the same problem and it may be related to the WAAS (Wide Area Augmentation System) feature. Try disabling this feature (under MAIN MENU / Setup). I used this receiver overseas (Asia and Europe) last year for 35 days straight with no problems. During this time WAAS was disabled as none of these satellites are visible overseas. The problem occurred intermittently prior to the overseas trip, and has reoccurred after returning. I was running into the same problem this past weekend and noticed the screen blanking out (with the vertical line) shortly after differential corrections were applied to the GPS signals. I disabled the WAAS and let the receiver run for over an hour. The problem did not return. Hope this helps.
Your battery is dead. You'll need to return it to Garmin for repairs. Mine did the exact same thing. Functioned fine in the cradle - showed full battery - but shut off immediately upon removal. They know about the problem and shipped me a new unit for free.