igxqrrl
Posts: 5
Joined: Thu May 16, 2019 8:23 am
Delivery Date: 16 May 2019

Chaotic Range Readings from 40 kWh 2018 SV

Fri Aug 02, 2019 4:08 pm

Hi!

I've had a 2018 Leaf SV for a couple months. For the first 2000 miles or so that I had it, I seldom used more than ~70 miles range before recharging, but I did notice on two occasions after longer drives that I got home with a lot less capacity remaining than I expected.

A couple weeks ago I forgot to charge at night, and during my commute to work the range started dropping precipitously when it passed 60% (or so), to the point that I wasn't sure I'd make it into work. Fortunately the rapid decline leveled off, and I got to work where I could charge.

After recharging, I spent that evening trying to reproduce the problem. Which turned out to be easy. I video'd this, and uploaded a portion of the video (below). There was a rapid decline to this point, but the real fun starts about 0:30 in. Note the ideal driving conditions (mid 70s, flat road, motor stays in the "eco" zone). The battery percent jumps all over but rapidly trends downward. Over the 8 minute video it starts at 39% and ends at 23%. I took a screenshot of Leafspy which appears to be showing one cell that has a lower voltage than the rest https://imgur.com/a/cCLHNm5

https://youtu.be/o9wprF0Wry0

I took the car to the dealer for repair, and they returned it saying they couldn't fix anything because there are no codes being thrown. On the drive to work the next day I recorded a video (below), showing more or less the same behavior, but dropping from 48% to 25% over 8 minutes. I took the car to the dealer again, and again they said nothing was wrong, and that I shouldn't bring the car back to them.

https://www.youtube.com/watch?v=b3z2BWc63LI

While I've not tried to drive the car until I get stranded, by my best estimates my 150 mile Leaf will get perhaps 100 miles range on a full charge.

Does anyone have suggestions for next steps? Is there any way to "prove" to the dealer that there is a problem? The other Nissan dealer in town is quite a jaunt away, but I may have to visit them next. I've started pondering a lemon-law claim but that seems like a huge hassle, and I really just want my car fixed...

Thanks for any suggestions!

Tortoisehead77
Posts: 61
Joined: Fri Jun 14, 2019 9:59 am
Delivery Date: 31 May 2018
Leaf Number: 307925
Location: Portland, Oregon USA

Re: Chaotic Range Readings from 40 kWh 2018 SV

Fri Aug 02, 2019 4:53 pm

My 2018 Leaf behaves that way sometimes, although not quite as drastic. The guess-o-meter is significantly off, usually.

I just drove to the Oregon Coast today and at around 40% remaining, the % started dropping rapidly. It’s important to note that this occurred during descent!! I should have been gaining miles using the e-pedal, not losing miles. As a approached 10 miles from the Chademo charger in Lincoln City, I started gaining a significant amount of miles, but not % of battery.

As a rule of thumb, I estimate a loss of 1% per mile, and this method has never left me stranded.

LeftieBiker
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Re: Chaotic Range Readings from 40 kWh 2018 SV

Fri Aug 02, 2019 5:41 pm

If there is a problem, it's likely a bad cell or two - marginally bad, not enough to throw a code yet. There have been a significant number or 40kwh packs with this issue. What is the build date on the driver's side door sill?
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
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Tortoisehead77
Posts: 61
Joined: Fri Jun 14, 2019 9:59 am
Delivery Date: 31 May 2018
Leaf Number: 307925
Location: Portland, Oregon USA

Re: Chaotic Range Readings from 40 kWh 2018 SV

Fri Aug 02, 2019 6:19 pm

LeftieBiker wrote:
Fri Aug 02, 2019 5:41 pm
What is the build date on the driver's side door sill?
My build date is 03/18

LeftieBiker
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Re: Chaotic Range Readings from 40 kWh 2018 SV

Fri Aug 02, 2019 6:34 pm

Tortoisehead77 wrote:
Fri Aug 02, 2019 6:19 pm
LeftieBiker wrote:
Fri Aug 02, 2019 5:41 pm
What is the build date on the driver's side door sill?
My build date is 03/18


Same month as mine, IIRC. Most of the bad cells have been in earlier builds, but I seem to recall at least one from March.
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.

Flyct
Posts: 259
Joined: Tue Nov 03, 2015 12:04 am
Delivery Date: 02 Dec 2015
Leaf Number: 307113
Location: Bradenton, Florida, US

Re: Chaotic Range Readings from 40 kWh 2018 SV

Fri Aug 02, 2019 7:45 pm

Looking at your LeafSpy pix you have a bad cell.



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LeftieBiker
Moderator
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Re: Chaotic Range Readings from 40 kWh 2018 SV

Fri Aug 02, 2019 7:48 pm

Yep. I didn't see a link to a LeafSpy shot.
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.

cwerdna
Posts: 9655
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: Chaotic Range Readings from 40 kWh 2018 SV

Fri Aug 02, 2019 8:19 pm

LeftieBiker wrote:
Fri Aug 02, 2019 7:48 pm
Yep. I didn't see a link to a LeafSpy shot.
igxqrrl wrote:
Fri Aug 02, 2019 4:08 pm
I took a screenshot of Leafspy which appears to be showing one cell that has a lower voltage than the rest https://imgur.com/a/cCLHNm5
I haven't watched the video but yes, that's bad. It shouldn't be like that when the car's nearly full.

Have the dealer run a CVLI test. It will fail. NO way there should be 200+ mV imbalance when the car's nearly full.

'19 Bolt Premier
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Please don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

DougWantsALeaf
Posts: 903
Joined: Fri May 10, 2013 8:21 pm
Delivery Date: 18 May 2013
Leaf Number: 407811
Location: Chicago North Side

Re: Chaotic Range Readings from 40 kWh 2018 SV

Fri Aug 02, 2019 9:10 pm

On the 40 battery, at what points does the car take a few percent and hide it in reserve?

On the 62 at different points between 80 and 35% it slowly hides about 8-9% of available capacity making the car appear to lose range faster then it does on Leaf spy.
2019 SV Plus Silver
2013 Leaf SV
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Max distance on 13 Leaf: 120 miles
Max distance on 19 Leaf: 242 Highway 4.5 miles/kWh (4.9 KWh remaining)

Tortoisehead77
Posts: 61
Joined: Fri Jun 14, 2019 9:59 am
Delivery Date: 31 May 2018
Leaf Number: 307925
Location: Portland, Oregon USA

Re: Chaotic Range Readings from 40 kWh 2018 SV

Fri Aug 02, 2019 9:38 pm

DougWantsALeaf wrote:
Fri Aug 02, 2019 9:10 pm
On the 40 battery, at what points does the car take a few percent and hide it in reserve?
That could be what’s happening to mine. I start to panic as I lose % rapidly when the battery first drops below 40%. But, I think I make some of that back under 20%. By the time I got to the charging station at the Coast today I had 13% left. But, I didn’t think I would make it because at 30% charge it was dropping rapidly. It was dropping fast even though I was on the west side of the coast range, which is generally more downhill (elevation loss) as you go further west.

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