LeftieBiker
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Re: Sudden Turtle Mode in Very Cold Weather

Wed Dec 27, 2017 2:29 pm

Charging to 100% may be serving as a bandaid for the problem. If the issue is one bad cell dropping below the BMS's allowed voltage threshold, thus causing Turtling, then starting with the highest cell voltage possible may mask the problem - for a while - until a much lower SOC is reached.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
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jotunheim
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Re: Sudden Turtle Mode in Very Cold Weather

Thu Dec 28, 2017 8:10 am

I was able to run Leaf Spy this morning right when I got to the dealer this morning. Attached is the battery test and summary screen. Is it fair to assume there is a problem with the first cell with it's color a dark red?

Image
Image

LeftieBiker
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Re: Sudden Turtle Mode in Very Cold Weather

Thu Dec 28, 2017 8:20 am

I'm not a LeafSpy expert, but I'd say yes, and that there are about 6 other cells that are much lower than the rest.

Just to be clear: you have charged the car to 100%, and until it shuts off charging, right?
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
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PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

jotunheim
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Re: Sudden Turtle Mode in Very Cold Weather

Thu Dec 28, 2017 8:29 am

LeftieBiker wrote:I'm not a LeafSpy expert, but I'd say yes, and that there are about 6 other cells that are much lower than the rest.

Just to be clear: you have charged the car to 100%, and until it shuts off charging, right?
Yes, the car was charged to 100% last night and was then unplugged. Leaf Spy reading was taken when I dropped it off at the dealer this morning with approximately 65% showing on the dash meter.

LeftieBiker
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Re: Sudden Turtle Mode in Very Cold Weather

Thu Dec 28, 2017 8:40 am

Looks to me like it has multiple marginal cells and at least one bad one.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
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BrockWI
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Re: Sudden Turtle Mode in Very Cold Weather

Thu Dec 28, 2017 11:01 am

I had a similar thing happen last night. Driving home after the car sat outside all day right about at 0F. The battery temp was just one bar (although I have seen no bars in previous winters). I had driven about 15 miles and was at about 24% leaving a stop light, not quickly or anything, I got the ding and turtle, I was about 1/2 mile from home. I slowed down to 25 (a 35 zone) and made it home and charged it. I totally didn't think to check Leaf Spy at the time, to worried about making it home, but I am guessing this is the same sort of thing, one cell lower that kicks the car in to turtle? I do charge to 100% daily, often more than once driving about 100 miles a day, with a lot of 15 mile trips. I have to think the cold must mess with the cells, some more than others? This morning I had a 12 mv spread. I will check it tonight and see if any are out of whack.
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LeftieBiker
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Re: Sudden Turtle Mode in Very Cold Weather

Thu Dec 28, 2017 12:21 pm

When my housemate plugged my car in for me a while ago, she got the three light plus beeping charging error. I have no idea what that's about yet, but it went below Zero here last night, and is about 8F now...
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

jotunheim
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Re: Sudden Turtle Mode in Very Cold Weather

Thu Dec 28, 2017 3:54 pm

Got the Leaf back from the dealer this afternoon. In short, they could not find anything wrong with the car. Each of the individual cell voltages checked out fine and there were no codes stored. They offered to keep the car overnight to see if they could replicate the problem, but I declined as it was unlikely to occur with the slightly warmer temperatures now.

For now, I will just keep an eye on it and run Leaf Spy if it occurs again, and forward any information I find to the dealer at that time. I would be curious if anyone else that has had this happen finds something that may be causing this to happen, or if it was just a fluke with the rapid swing in temperature we have had in the upper Midwest.

LeftieBiker
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Re: Sudden Turtle Mode in Very Cold Weather

Thu Dec 28, 2017 6:08 pm

An intermittent short in one or more cells might be the culprit, but I'd expect that to produce some kind of error code...
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

troyf
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Re: Sudden Turtle Mode in Very Cold Weather

Sat Feb 16, 2019 12:43 pm

@jotunheim You hit turtle mode with enough battery that turtle mode was not expected... a year later, can you provide any information about battery issues you ran into after this?

I also hit turtle mode with a near full charge and 31 miles when it was near zero degrees Fahrenheit, 1.7 miles after starting out in my 2012 Leaf (it's now Feb 2019). I have 69K miles, 8/12 bars of battery "health". No bars on the battery temperature gauge. I'd like to call it a cold weather fluke rather than a predictor of problems. Your experience since your issue would help a lot!

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