Getting system malfunction after 3000 miles with brand-new AGM battery.
Hey all,
TLDR at the bottom of this post. I know this is a saga. 😂
Wanted to see if I could get some help and insight here. We purchased our ‘23 Ariya Platinum+ e4orce in September of ‘25. We’ve been loving it with a few exceptions:
around Christmas of this past year it left me stranded about 30 minutes from home with the typical “EV can’t start” and “can’t detect key” thing. It turned out to be a 12v battery, so with all the recommendations from the EV community, I swapped it with an AGM battery and put it in myself. All was fine but immediately after installing that battery, I was getting system malfunctions and zero ADAS. So, I took it to the dealer and had it reprogrammed - all was fine.
Fast forward to now, just as of this weekend, I’ve started getting the same “System Malfunction” warning ⚠️ every few starts and once I put it in reverse get out of my garage. If I turn the car off, wait a few seconds and turn it back on, the error seems to go away and I can drive it with or without ADAS and Pro Pilot. Once at a destination and parked, after it’s sat for a few minutes and I come back to it from whatever errands I run, once I throw it into gear, it’ll give the same error. This last time it flashed once “key battery low” and then went away. It has given that exact warning twice in one hour now this evening. I replaced the key fob batteries around Christmas along with the AGM battery. I’ve attached pics and have a service appointment with the dealer but wanted to see if anyone else has dealt with this and what the issue may have been?
A few critical pieces of info that I’m hoping may help:
I trickle charge with the stock charger on a 110v. I don’t drive that often to really need a level 2 installed but I’m wondering if anyone thinks that may be a cause of 12v drain if it’s not properly charging the new AGM 12v?
Does anyone have any reason to think that upgrading my home to a level 2 or NEMA 14-50 is going to make a marked difference in issues like this?
It rarely sits for more than a day before being driven again. So mostly around town and then back home to charge. I let it get to around 40% before plugging in at home and only fast charge every so often when taking trips across state lines to visit family for a day.
I have a Redtiger front and rear dashcam but it’s plugged into the cigarette lighter 12v plug in the front console and only runs while the car is on.
Any help is appreciated before my Wednesday appointment with Nissan. I don’t always use AI for this stuff, but Claude seems to think maybe the AGM isn’t being charged by the car?
TL:DR, car with 14200 miles and a five month old AGM battery is giving malfunction warnings on startup. If power cycle the car, the warning goes away. ‘23 Ariya Platinum+ e4orce.
Edits: grammar.