2007 Prius Turning on By Itself

Yeah the battery exhaust connection to the car body vent is pretty crappy. Its just loose there with the one screw.

 

I have read through this entire post. The result of which is that it would appear that the only solution that has been found is to clean the battery terminal?

 

My 2008 Prius has been turning itself on for the past two days that I have noticed. I suspect it may have been longer since. On Monday I parked my car and went into work got out 8.5 hrs later and my car battery was dead. Called AAA got a jump start and found I was also out of gas. I am going to check all my terminals and connectors when I get home but for now I disconnected the white connector to the 12.5 volt battery so I am not stuck tonight. It’s insane

 

Why would you suddenly be out of gas?

Any loss of the 12v system results in the fuel gauge going to one flashing dot until it recalibrates itself. Unless you ran out of fuel just as you parked the car, you just need to give the level detector a few minutes to reset itself.

 

Bringing this back from the dead. My 2007 started doing this. One time the dash didnt work and the car wouldnt power off so I thought combo meter, but now the dash seems to work fine but I'll power it down and if I dont walk away and lock it the car will power back up. Seems to reset climate settngs and clock when I do it too.

Anyone ever get a resolution? i see a lot of posts about this and not many comments about fixes.

 

I believe this can happen when the 12v battery is disconnected or 12v pawer is lost while the car is on. When power is restored, the car tries to return to its previous condition. You may want to go through and verify all the 12v connections in the battery area. I know I've read about this in one of the manuals. I don't remember which ecu does this, maybe the power source ecu? I'll try to find it and post it later today.

 

Jinkies! My 2006 is starting by itself with no key nearby. Separate, but maybe related, try to lock the doors and they unlock themselves. Both with the keyfob, and without...Replaced the 12v battery today and am chewing Scooby Snacks. Fingers crossed.

 

The doors will unlock themselves if something prevented them all from locking completely (a worn-out actuator in one door that can't completely make it to locked, a Scooby Snack stuck in the mechanism, or whatever).

The car notices it didn't achieve complete lock at all doors, and flips them back unlocked so you'll notice something's amiss.

I've only seen it when an actuator was worn out, but it's conceivable a low-enough 12-volt battery could be a cause (not enough power to the door actuators to complete the motion).

 

It's usually better to test than to just aim a parts cannon at the car. You can introduce other issues; if you install or mis-install a counterfeit part. Then you end up going down a rabbit hole... By the time you get here, we're assuming nothing has been touch and everything is factory - so we may send you down the wrong path.

Just my 2-cents....