Anyone ever had their 12 volt die while their leaf was charging overnight? Is it time for a new battery or is something else wrong?
2015 Leaf, Clipper Creek 30 amp L2 charger
Yellow car appears after first start, then not again until the next day. Drive car for a week, charging at night. Then
12 volt battery drain while car is charging overnight, charging stops at 22.1kW instead of 22.6kW
Filled battery with distilled water, charged, drove for several days, 12 volt battery showed 12.6 volts or more before start and charge of 2 to 8 amps the first mile.
12 volt battery drains AGAIN while car is charging, charging stops at 22.1kW instead of 22.6kW, 6 volts remaining. Hook up portable jump box, plugged it back in and it started charging, showing 78 amps behind the 14.4 on LeafSpy. Drove the ICE to work.
After 2 hours it was driven and returned home. Sat for 3 hours and 12 volt bat is 12.16 volts.
The Yellow car with the ! had started showing up first trip of the day, then would be off after that. The codes the would show on spy leaf would be the P3131, U1232, the U1A00. Tried a google search on the p3131, then finally here. OK, could be TCU problem, but it was only in the morning. Drove for a week with the same thing first trip of the day - I first noticed it after charging - and would not appear till the next.
Last Friday, after charging the car all night, I unplugged the car and went to start it and nothing. Door nail mode. I suspected the battery so I grabbed the portable jump box and hooked it up. Opened the door, pressed the start and the instrument panel list up but there was no tune and it would not go into drive (just testing - I did have the hood up and the jumper box connected). I pulled out LeafSpy and read the DTCs. I noticed it was charged to 22.1 instead of the usual 22.6 kW, hmm. Hooked it back up to the level 2 charger and nothing. Unplugged the L2. Unplugged the jump box. Forgot to look at the battery charge on LeafSpy. I would share with you a picture of the codes showing but there is no way to add a picture that I can tell.
I decided to check the fluid level and found the first cell to be showing, cells 2 - 5 were just above the cell. I added distilled water and hooked up my regular charger. (Yes I now realized I should have charged and then added water (as it says on the internet) but nothing leaked out). The next morning the battery was charged and ready to go.
The car ran fine. SpyLeaf was showing a charge to my 12 volt from 8 to 4 amps for the first mile and then nothing. Every time I started it the next couple of day it did the same thing, charged and leveled off. Lowest battery ever got was 12.56 while off was.
I charged it last night and as I left for work in the ICE auto, I pulled out my LeafSpy as I passed it and it was showing 6 volts. Got out the portable jump box and hooked it up. LeafSpy also show 22.1kW. This time I was able to plug it in and the dash charging lights came on and started charging the drive battery. I unplugged the jump box and it kept on charging. The battery showed 14.47 v and 78 amps charge - which I assume in the amps to the drive battery getting it up to 22.6kW. After 2 hour my wife unplugged it and everything was fine.
Noticed it was down to 12.16 volts after sitting for 3 hours. I read from one site that if a cell of a 12 volts gets exposed to air, it can become damaged and not hold the charge as well, or something to that effect. My first cell had the top of it exposed, no liquid over it.
After 6 hours it is down to 11.76 volts.
DTCs showing are probably expected for this condition:
U1000 008 BCM CAN Comm Circuit,
B2562 - BCM Low Voltage BCS-69,
U100A 8708 CHARGER,
VE/HEV codes P3100, 3131, 3178, 3180, 317B, 317E,
P0A8D 008 Motor Control 14v Power Supply EVC-123/TMS63,
P3247 Motor Control Drive Motor Inverter TMS-91,
U1000 0008 TCU CAN COMM CIRCUIT AND ACC No Con Av-194
Last edited by jimmol
on Wed Aug 15, 2018 6:36 pm, edited 2 times in total.