specialgreen
Posts: 64
Joined: Sun Mar 26, 2017 1:21 pm
Delivery Date: 26 Mar 2017
Location: Minnesota

Sudden turtle at 55% SOC -2F

Wed Dec 27, 2017 9:30 am

2017 Leaf S, Minneapolis MN. Almost 3K miles in 3 months. No problems so-far (knock-on-lithium).

My wife took the leaf for a short (2 mile / 3km) drive to an appt. this morning. Temps were about -2F / -19C . She texted to ask what the turtle meant ( :shock: ). She reports that the dashboard SOC says 55%, so I’m not sure.

Last trip was 10 mi./ 16km (round trip) last night, no problems noticed.

l will plug-in leafSpy when she gets home. I’m thinking I should take it to the dealer. I wonder if I should try to take it to the dealer before charging it? Or charge it at home, then take it to the dealer?

jotunheim
Posts: 13
Joined: Thu Aug 22, 2013 7:51 am
Delivery Date: 05 Sep 2013
Location: Milwaukee, WI

Re: Sudden turtle at 55% SOC -2F

Wed Dec 27, 2017 11:19 am

I had nearly the identical situation happen to me as well yesterday morning, and have a thread going here:

http://www.mynissanleaf.com/viewtopic.php?f=30&t=25071

Taking it to the dealer tomorrow morning to see what they find. Not super happy about the issue, but hopefully it is an easy fix and kinda glad to hear I am not the only one!

Jason

jjeff
Posts: 1573
Joined: Wed Jan 13, 2016 9:10 am
Delivery Date: 13 Jul 2014
Leaf Number: 422121
Location: MSP MN

Re: Sudden turtle at 55% SOC -2F

Wed Dec 27, 2017 3:35 pm

specialgreen wrote:2017 Leaf S, Minneapolis MN. Almost 3K miles in 3 months. No problems so-far (knock-on-lithium).

My wife took the leaf for a short (2 mile / 3km) drive to an appt. this morning. Temps were about -2F / -19C . She texted to ask what the turtle meant ( :shock: ). She reports that the dashboard SOC says 55%, so I’m not sure.

Last trip was 10 mi./ 16km (round trip) last night, no problems noticed.

l will plug-in leafSpy when she gets home. I’m thinking I should take it to the dealer. I wonder if I should try to take it to the dealer before charging it? Or charge it at home, then take it to the dealer?

Also in MSP but with a '13 and I've never had that happen, even yesterday while the range was severely impacted by the cold weather(<50 mile range reported) I never had the turtle issue. Note I was missing a bubble or two of regen, even in mid SOC's, still I had all bubbles of power. I'd take it to the dealer, preferably in the morning when it's cooler, -10F lately :(
2012 SL purchased used 2/'16
2013 S w/QC purchased new
Juicebox Premium 60a L1/L2 EVSE, Ebusbar 16a L1/L2 EVSE
'12 EVSEupgrade'd 20a L1/L2 EVSE, '13 EVSEupgrade'd adjustable 6-20a L2, 6-13a L1 EVSE
Zencar 13, 20, 30a L1/L2 portable EVSE
GE Durastation 30a

specialgreen
Posts: 64
Joined: Sun Mar 26, 2017 1:21 pm
Delivery Date: 26 Mar 2017
Location: Minnesota

Re: Sudden turtle at 55% SOC -2F

Wed Dec 27, 2017 4:29 pm

The beep+turtle happened about 1/3 mile after leaving home, driving on level ground at 30 mph. My wife drove a mile further, parked the car for two hours, and when it was started, the turtle was gone.

Her drive home was normal. I drove it on an errand, and everything was normal.

I charge about every other day to 90%, and once per week I charge to 100%.

I uploaded Leaf spy screens to Dropbox :

https://www.dropbox.com/sh/wwsh0psbd7ia ... PDkya?dl=0

GerryAZ
Gold Member
Posts: 1561
Joined: Mon Nov 22, 2010 6:47 pm
Delivery Date: 12 Jun 2011
Location: Phoenix, AZ

Re: Sudden turtle at 55% SOC -2F

Wed Dec 27, 2017 8:02 pm

Did you check for trouble codes? The cell voltage graph looks normal. The other three screen shots are not really valid because Leaf Spy was not communicating with adapter (note yellow communication status boxes). It is under warranty so make it the dealer's problem to solve.
Gerry
Silver LEAF 2011 SL rear ended (totaled) by in-attentive driver 1/4/2015 at 50,422 miles
Silver LEAF 2015 SL purchased 2/7/2015

Evoforce
Posts: 702
Joined: Wed Mar 04, 2015 9:58 pm
Delivery Date: 28 Feb 2015
Location: Fountain Hills Arizona

Re: Sudden turtle at 55% SOC -2F

Thu Dec 28, 2017 3:32 am

GerryAZ wrote:Did you check for trouble codes? The cell voltage graph looks normal. The other three screen shots are not really valid because Leaf Spy was not communicating with adapter (note yellow communication status boxes). It is under warranty so make it the dealer's problem to solve.


+1
*2011 Leaf 1 bought 2/28/15 @ 28,000ish mi 10 bar (8 bars @ 11/25/15 @ 37,453 ) (New lizard @ 39,275 mi @ 1/20/2016) Now 52,166 mi.
*Tesla Model S 61,000 mi
*2011 Leaf 2 bought 4/28/15 @ 24,000ish mi 12 bar (new lizard Dec. 2014 @ 22,273 mi) Now 35,485 mi

specialgreen
Posts: 64
Joined: Sun Mar 26, 2017 1:21 pm
Delivery Date: 26 Mar 2017
Location: Minnesota

Re: Sudden turtle at 55% SOC -2F

Thu Dec 28, 2017 1:41 pm

I took it to the dealer on the way to work. They reported one "past" code: "control module over temperature." They said this was probably due to a assembly problem: the factory routing of a coolant hose was sometimes kinking, causing temperature problems. They rerouted the hose, and sent me on my way to work.

The invoice says "Cause: CD18AA RPL LOWER RADIATOR HOSE" AND "3041 RADIATOR HOSE IS NOT ROUTED CORRECTLY" and "POSITIONED LOWER RADIATOR HOSE PER BULLETIN". There's no mention of the exact DTC or TSB. I will call them and see if I can get that tomorrow.

It does seem a little odd that a module would overheat 1/3 mile from home, on a -2 degrees F day, after being parked outside (and not plugged-in) overnight... versus, say, last September when I fast-charged it at 84F ambient. My suspicion is that the DTC was not recent, and maybe the dealer had no idea why we saw a turtle, but wanted to "be responsive to the complaint." I'm ok with it, because at-least the dealer has a record of "sudden turtle onset" (SDOS) within warranty.

LeftieBiker
Posts: 7886
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: Sudden turtle at 55% SOC -2F

Thu Dec 28, 2017 2:39 pm

Good point on the record. Make sure that you keep your copy.
2013 "Brilliant Silver" SV with Premium and no QC, a 2009 Vectrix VX-1 W/18 Leaf modules, and 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

specialgreen
Posts: 64
Joined: Sun Mar 26, 2017 1:21 pm
Delivery Date: 26 Mar 2017
Location: Minnesota

Frozen Turtle Syndrome

Thu Jan 04, 2018 4:54 pm

Well, I got a second occurrence of Sudden Onset Turtle Syndrome. I had parked the car overnight in the street, low of -14F. I went out to move it to the charger before I left town, and got an immediate turtle at -10F. Leafspy screens show 66% SOC, 1 degree F battery temp, but 34mV max cell delta.

Image

Unfortunately, I left town with both keys in my suitcase, so the leaf sat there, forlorn and unplugged, for 4.25 days. Over that time, ambient temps were (low/high): -14 / -6F , -5/-16F , -13F / +1F, -10F / +12F, +0/+6F

The car was parked with no protection; weather was cloudy; and the car is white. So I was expecting that the 300W battery heater would kick-on quickly, and run for about 34 hours (10kw-hrs... until the SOC drained to 30%), then stop. After that, the pack temp would approach average ambient, which would probably be between 0F and 3F (which should be OK, as my manual says the heater doesn't kick-in until below 0F).

However, when I returned, I was surprised to find that the actual battery temp was 8F... and the traction battery had only depleted by 3 GIDs or "0.2% SOC". That could mean that the battery heater never came on at all (or my 2017 S doesn't have one?). Or that the LeafSpy-reported numbers are just wrong.

Image

Anyways, the car has turtled twice: once 1/3 mile from home at -2F; and once immediately at power-on at -10F. In the second instance, cell balance showed 34mV delta, but after sitting for 4 days (and the pack warming-up to 8 degrees F), the cell imbalance improved to only 18 mV. So I'm suspecting that cold temperatures magnified the measured cell imbalance, triggering a spurious turtle; with a possible contributing factor of a non-working battery heater. I'm going to call it "Frozen Turtle Syndrome" instead.

GerryAZ
Gold Member
Posts: 1561
Joined: Mon Nov 22, 2010 6:47 pm
Delivery Date: 12 Jun 2011
Location: Phoenix, AZ

Re: Sudden turtle at 55% SOC -2F

Thu Jan 04, 2018 5:12 pm

34 mV for cell voltage delta is not enough to cause Turtle mode by itself. Turtle is normally caused by the lowest cell-pair voltage getting down to the threshold (which is below 3 volts) so something else is happening with your car. We have not seen a bunch of sudden turtle reports in spite of cars being driven in cold weather so Nissan needs to fix your car.
Last edited by GerryAZ on Thu Jan 04, 2018 7:44 pm, edited 1 time in total.
Gerry
Silver LEAF 2011 SL rear ended (totaled) by in-attentive driver 1/4/2015 at 50,422 miles
Silver LEAF 2015 SL purchased 2/7/2015

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