onsickm

I have no power coming from battery to car. Battery is registering 12.9V so it should be good to start car but there is nothing working in the car.
Does anybody know why car is not powering up? What could be stopping power to start radio, ac, dash..etc?

Also I tried to jump start but no luck.

snethss

you'll need to charge it normally or jump it via the fuse panel. There are tutorials on how to do this with some searching.

You may have a parasitic drain or a bad alternator. Do you have something plugged into any of the car adapter outlets or ODB port?

onsickm

As I mentioned in my original post, I tried jumping it from battery itself as well as from inside fuse box but no luck
I don't have anything plugged to drain it. I have aftermarket stereo but that has been installed long time ago and never had an issue until a month ago

onsickm

Anybody know how to get key out of ignition switch?

Linnm

You have to get a fully charged battery into to the fuse box by your left foot when inn the car. You will have to read your manual on how to remove the key.and open the hood,

onsickm

Thanks I was able to get key out but I still have no electricity. I also brought a jump start but no luck!

Does anybody know how to diagnose this problem? Why car is not getting any power from battery?

Petza914

So this sounds like a new development? Has the car been in an airbag deploying accident recently? There's a pyro fuse that blows when the airbags go off that cuts power to the engine, but the interior stuff would still work. If not, I'm betting the non-battery end of your ground cable has worked loose - it's short, just follow it from the negative terminal and inspect its condition and tightness. If not that, the battery could be completely shot, showing a surface charge of 12.9 volts but having 0 capacity, but the jump start probably would have worked, so I'm still thinking loose ground cable or loose connection at the battery terminals.

Other ideas - the immobilizer module in the key or the one in the car that communicated with the key. Does your 2nd key do the same thing?

onsickm

Petza914

I don't know what happens if you try to use the wrong key in the car. If something with the immobilizer chip or module is the problem I'm thinking it might exhibit this behavior and not send power to anything, but I think I read the center LCD display would show a message of some sort.

Have you tried physically unlocking the driver's side dour with the blade of the key. If the car sits locked for dime number of days, it takes this process to wake it back up. Maybe yours os in this sleep mode even though the door isn't locked.

onsickm

NuttyProfessor

If you've properly tested the battery with correct load, then you should next check any fuses that could have been blown because of a short. Also, be mindful that there are many linkages between the battery and starter/alternator and ignition relay system. You must try to find the culprit that is causing the loss of 12V DC connection. I always start with the obvious (e.g. blown fuse), then work towards the more invasive possibilities. I would spend a couple of hours attempting to remedy the problem. After that, I'd have it towed.

Oh, and once you get it working. Go first thing to Porsche and have a secondary keyfob made. Lots of horror stories surrounding losing the only key.

onsickm

CAVU

What is the year and model for this 911? There are a number of different electrical issues over several different years and variants.

Petza914

I think your battery is toast. How are you measuring the 12.9 volts - simply with a voltmeter across the battery terminals? That will give you a surface charge voltage but as soon as the battery gets a load, it's probably registering as dead. You stand in the frunk with your voltmeter measuring the battery voltage and have someone else try to start the car by turning the key and then see what the actual under load battery voltage is. Also, if the current battery is internally shorted, trying to jump start the car by hooking up a 2nd battery with the first one still connected may not work either. If you know the jump start battery is good, disconnect the one currently installed in the car and remove it. Then hook up the jumper cables between the other battery and the car's cables and see what happens. Bet it responds differently.

JWILLI

From the 996 world, the symptoms of a sticky key and no power with a full battery would point to a faulty ignition switch.

https://rennlist.com/forums/996-turb...r-and-diy.html

https://rennlist.com/forums/996-foru...-not-dead.html