how to reboot Gen II

Unplug the 12v battery and replace it, yellowtop optima is a good choice, turning off and unplugging a digital device is a reboot.

Amazon.com: Optima Batteries 8171-767-FFP (DS46B24R) YellowTop Prius Battery: Automotive

 

Try running the test with the MFD and check the voltage on your yellowtop. Should be Ok, but recently been several reports of yellow tops not holding up as well as they used to.

If you don't know how to do that, click the link below and follow the instructions there.

Weird stuff happening? MPGs dropping? Test The Battery | PriusChat

Run the test and post back all three of the values you see.

 

I bought an Optima 18 months ago, and had to return it twice because it kept losing capacity and then finally gave up, returned it and bought a Toyota OEM battery from the dealer.

My advice: get a new Toyota battery from the dealer and if you can bring the Optima back and get your money back (it should have a 2 or 3 year full warranty). I bet that Optima went bad.

 

what do you mean by, " had to hit the key fob to get it to start"? if you want to try rebooting first, disconnect the 12 volt. while you're in there, you can do some testing to see if it's weak.

 

Prius reboot/reset/initialize must be done on level ground.
If not done on level ground (driveway incline).
Gas guage will be off. Mg2 torque-bias/zero-current adjustment on level ground will also be off.
There is an incline-o-meter that controls fuel trim on inclines as well as mg2 torque/current consumption on inclines.

Jump starting a prius should be done on level ground if possible. If not possible just reset/reboot/reinitilize the next day or two after 12 volt battery gets charged.

Reboot/reset/reinit. By disconnecting 12 volt battery for about 2 minutes.

The positive battery connector at the battery has two quick disconnect connectors. Disconnect the smaller wire connector first and the larger wire second. After about 2 minutes connect large wire connector first and the smaller wire last.

Driver side window will need reseting just open window half way then raise to fully closed position an hold for one extra second then release. Radio presets will not be lost with the 12 volt battery only disconnected for under about 5 minutes. Trip gauges and ave mpg readings will be zeroed. And fuel trim will be reset and relearned in the next 100 miles.