Clear 12v Battery Warning Will It Come Back

[chaserda]

I didnt drive my car for over a week and returned to a 12v battery warning / needs replacement. I cleared the message yesterday by doing a Wheel Configuration swap under settings which made it hard reset and clear. If the battery actually has problem will the warning come back? I just want to make sure I am in the clear before I cancel my appointment I made about a month ago to have it replaced. ( Read a post that this can happen if you let your car sit for over a week ) so Im thinking that was the issue and I dont really need a new battery. Thoughts?

 

[Tdriver]

If the car is about two years old there is a very good chance you need a battery. I had both M3 indicate yesterday. One would not respond and had to be towed, the other had a warning. Both were 2 years old.

 

[chaserda]

Mine is 2014 but I also dont know if the previous owner ever had it replaced either. The reason I ask is I am getting ready to sell it and I dont want to have to drop more money into if I dont have to. I also dont want to be stranded in a week or the people That buy it stranded on their way home lol

 

[ucmndd]

I also dont want to be stranded in a week or the people That buy it stranded on their way home lol

So then do the right thing and pay the $250 vs clearing the error telling you what to do?

 

[Prachatice]

Brings a question to my mind: Does the 12v battery keep its charge from the big battery? My car has sat in the garage for quite some time and didn't even think about the 12v battery. If not, are people using a trickle charger for the 12v?

 

[Ostrichsak]

If the car is about two years old there is a very good chance you need a battery.

This is HIGHLY uncommon and I would suspect you have another issue. Most Teslas will get 4-5 years of life from the 12v battery. If you're getting only 2 or even 3 years that would be cause for concern for me.

 

[BrokerDon]

This is HIGHLY uncommon and I would suspect you have another issue. Most Teslas will get 4-5 years of life from the 12v battery. If you're getting only 2 or even 3 years that would be cause for concern for me.

Our 12V battery is being replaced in our March 2015 built P85D+ today... 5.3 years after it was installed. We keep our P85D+ plugged into our Tesla HPWC unless we're driving it which should always keep our 12V battery charged when connected to the HPWC.

 

[ucmndd]

Our 12V battery is being replaced in our March 2015 built P85D+ today... 5.3 years after it was installed. We keep our P85D+ plugged into our Tesla HPWC unless we're driving it which should always keep our 12V battery charged when connected to the HPWC.

The HV battery tops off the 12v whenever needed, usually multiple times per day, regardless of whether or not the car is connected to shore power.

 

[ucmndd]

This is HIGHLY uncommon and I would suspect you have another issue. Most Teslas will get 4-5 years of life from the 12v battery. If you're getting only 2 or even 3 years that would be cause for concern for me.

Generally agree. OP references Model 3 though, and there has been a rash of early M3 battery failures recently, right around the 2-3 year mark.

I think that’s likely a bad batch of batteries though or some design issue that may have been fixed in later cars or software releases.

 

[2101Guy]

When I installed my NVX amp/subwoofer, I had to (obviously) run a positive cable to the 12v battery. It was upfront and center and seemed very easy to remove replace. Is it that simple, or is there coding involved/needed to swap/replace successfully?

 

[BigTonyTones]

Some people get 4-5 years others get less. I got 18 months for each of my two batteries.
Ended up getting an Ohmmu lithum battery and hopefully never have to change it again. I did an install video on youtube if interested

 

[AMPd]

Brings a question to my mind: Does the 12v battery keep its charge from the big battery? My car has sat in the garage for quite some time and didn't even think about the 12v battery. If not, are people using a trickle charger for the 12v?

If you think about it where else would it get it’s charge from?