Battery Condition - New 992
Thread Starter
Advanced
Joined: Aug 2021
Posts: 74
Likes: 27
Battery Condition - New 992
I picked up a C2S cab a few months ago and I wonder if there an issue with the battery (AGM, not lithium). I occasionally get strange PCM errors that go away quickly (WBA system unavailable, convertible top error, Key Fob battery low). In preparation for winter, I got a CTEK MXS 5.0 and hooked it up with pigtails. I was expecting it to quickly get to level 7 given the new condition of the battery. However, it sat all night on level 3 (charging quickly up to 80%) and in the morning was only at level 4 (charging slowly above 80%). Does this perhaps indicate there is an issue with the battery?
Rennlist Member
Joined: Feb 2017
Posts: 378
Likes: 235
From: Louisville
I have thought the same thing with mine. 2022 MY and I get the "key not found, Start Stop not Available, WBA System Unavailable (1 Time)", and the settings for the Bose are wiped out seemingly every other day. I use a CTek as well and it takes all night for it to get to trickle status even though my car is only 3 months old. You can always go to Autozone or Batteries Plus and have them test to be extra sure, but I think this car is electronically glitchy. Hoping some software updates will fix most of them soon.
Rennlist Member
Joined: Apr 2021
Posts: 762
Likes: 747
From: Ohio
I made it a habit to connect the maintainer whenever I don’t drive the car for a couple of days. Considering the size of the AGM batteries in my BMWs, I believe the 992 (AGM) battery is undersized causing the issue whenever the car is not moved frequently. Further, comfort access etc can can cause additional drain if the key is nearby.
Rennlist Member
Joined: Mar 2014
Posts: 11,866
Likes: 2,068
From: Midwest
I made it a habit to connect the maintainer whenever I don’t drive the car for a couple of days. Considering the size of the AGM batteries in my BMWs, I believe the 992 (AGM) battery is undersized causing the issue whenever the car is not moved frequently. Further, comfort access etc can can cause additional drain if the key is nearby.
RL Community Team
Rennlist Member
Rennlist Member
Joined: Sep 2008
Posts: 3,233
Likes: 1,732
Take it to the dealer and start building up a case to make them replace it. Read the warranty book and go prepared. It's an upstream battle.
Search for threads about battery issues. Plenty out there.
Search for threads about battery issues. Plenty out there.
Trending Topics
Rennlist Member
Joined: Apr 2021
Posts: 762
Likes: 747
From: Ohio
There are issues reported for both types. This may be an issue with battery capacity, the BMS and /or drains from various assistance systems and the occasional battery failure (that happens everywhere). The only thing I know is that my 2020 Z4 (and all other BMWs I still own) could be left alone weeks at a time and starts up with no issues, while the 992 shows signs of discharge, e.g. handles not coming out, PCM lights up with all kind of nonsense warnings etc. Those issues do not occur when driving every day (30min+) or keeping it on a maintainer.
Rennlist Stories
The Best Porsche Posts for Porsche Enthusiasts
Stunning Porsche 356A Super GT Speedster Auction Fails to Meet Reserve
Verdad Gallardo
Every Era of 911 Owner Explained in One Sentence
Verdad Gallardo
Thinking of Buying a Porsche? Do These 10 Things First
Joe Kucinski
Pixar Pals Turned Into 1-of-1 Porsches!
Michael S. Palmer
Theon Goes Full Carbon Fiber With Stunning New Build
Verdad Gallardo
Genius Porsche-Themed Gifts That'll Make Any Dad or Grad Smile
Joe Kucinski
10 Used Porsches Are Selling for Way Too Cheap
Joe Kucinski
Tuner Is Converting Porsche 911s Into Shooting Brakes
Verdad Gallardo
This Coachbuilt Creation Is A Modern Take on the Legendary Porsche 917
Verdad Gallardo
RL Community Team
Rennlist Member
Rennlist Member
Joined: Oct 2019
Posts: 6,704
Likes: 3,034
From: Moose Mtn. Alaska
I doubt it as the sensor will be constantly "looking" or pinging to see if a key is in the vicinity. It's likely a phantom drain that will take time and patience to discover.
siberian
siberian
Three Wheelin'
Joined: Mar 2020
Posts: 1,330
Likes: 865
From: Naples, FL
For what it is worth (free advice and reports are worth exactly that) I store my key as far away as I can get from the car. I also lock it.
I have a batter maintainer, but haven't hooked it up to the car (yet) because I am just lazy and haven't wired it up yet (waiting for "winter" in FL).
I drive it on average every 3 weeks and have yet to have an battery difficulties. Picked the car up brand new in January of this year and have 2,0xx miles on her.
Zero problemos, no problems starting, no problems driving.
I have a batter maintainer, but haven't hooked it up to the car (yet) because I am just lazy and haven't wired it up yet (waiting for "winter" in FL).
I drive it on average every 3 weeks and have yet to have an battery difficulties. Picked the car up brand new in January of this year and have 2,0xx miles on her.
Zero problemos, no problems starting, no problems driving.
Rennlist Member
Joined: Sep 2017
Posts: 1,900
Likes: 1,304
From: Chicago
While I think your car is a 2022 and probably not affected, this does sound like something the ground strap recall would affect.
https://rennlist.com/forums/992/1301...ding-bolt.html
https://rennlist.com/forums/992/1301...ding-bolt.html