Ive been having issues with 2014 v8s 20k miles, All the warning lights you can imagine start going off. Abs, active dynamics, stability control, e diff, etc etc. Convertible top also will stop working. This happened at random and after the car sitting for a little, everything is fine again. I suspected low voltage battery, but testing battery showed its fine. Replaced it anyways and hoped all would be good, then last night it happened again, disconnected battery for 30 seconds, and car was fine again. I have no clue whats going on with the car, and some other posts on the forum seem to have the same issue, wondering if anybody was able to find a solution? I dont know what to do. Maybe its one of the other batteries? ive heard theres 2-3 batteries in the car? or the alternator even though it tested fine? The warning lights start as one or two, then shortly after everything you can imagine is flashing on the dash. This all started after i had a battery drain issue from the OBD2 port, and took a couple weeks to disconnect the battery and reconnect it.

 

Did you make sure the new battery was fully charged when you installed it? They're not always supplied that way.

 

no but i drove it for about an hour on highway the same day i picked it up. Figured that would charge it up.

 

Best to give it an overnight charge, then assess what happens. Just to eliminate that possibility,

 

will do tonight, thanks! any idea of next steps if it’s still an issue after?

 

Use a smart phone with the Torque app to communicate with the vehicle's PCM via the OBD port with a Bluetooth interface to read the voltage output of the alternator.

Charge the battery at 2 to 5 amps for 5 hours and with the ignition in the OFF position, use a voltmeter to read the voltage across the battery terminals. There should be a minimum of 12.6 volts for all vehicle systems to function correctly.

 

Check for loose battery connections and loose grounds. I had a battery terminal that seemed tight but wasn't really and that allowed electronic poltergeists to move in. Fixing that exorcised them.

 

I figured with electrical issues im in over my head, so dropped it to dealer. Will update the thread with whatever happens. Lets hope its an easy find. Thanks!

 

These jag are very sensitive to battery voltage. The first purchase I made was a Ctek battery maintainer and installed it with pig tails. I always attach the Ctek when I’m not using her. It a rote procedure for me. Battery has not given me any problems that are associated with a low battery. I’ve taken her on many week long trips with no issues. I’m confident that since my battery is always on the Ctek when not in use, the battery is in top form. I highly recommend using a Ctek when parked. There are many comments on this topic. Good luck with your issues but IMHO your issues may be resolved with a Ctek.

 

Sorry I forgot to update that I did try using the Ctek overnight and it didnt work. I also daily drive the car. I dont think its reasonable to have to leave the car on ctek every night just to have a normal working car. Shortly after using the ctek, the electronics went haywire again (maybe 2-3 days after) So ive deduced it cant be a battery issue. When I bought the car this wasnt an issue, and If it was a battery issue then i think ctek overnight or new battery would solve it, but neither have done so. ​​​​​​​

 

I realize the car is now in the shop, so you'll hopefully get a definitive answer shortly.

Definitely sounds like a power issue. Yes, there are 2 batteries on your car, but the smaller one isn't the issue. (It supports stop/start and has been disconnected by some.) The main battery could be due for replacement (you didn't say anything about its age), or you're still getting a power drain. Note that even if you end up getting a new battery, it's worth starting it off with a full charge on the CTEK. Not all batteries start out full. An easy sign of a power drain is to check the light on the emergency flasher after the car is turned off. The light will start out on, but should cut off in about 10 minutes as the car moves to the next level of shutdown. If it doesn't, you have something going on. Worth checking, just in case, when you get the car back.

As mentioned above, a bad ground could also cause issues. I rate it third on my list since this is a new problem, but it's plausible.

 

Thanks for the reply! I Dont think its the battery because I had it replaced even though it tested working, then after replacing gave it a overnight charge. At this point im just hoping the dealer will be able to catch it fast, otherwise those diagnostic hours might really add up