GerryAZ
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Location: Phoenix, AZ

Re: D mode stays on even while on B mode

Fri Jun 09, 2017 8:13 pm

You have some CAN Bus communication errors so I suspect there are issues with the various modules sharing information. If there are communication errors, the car may default to reduced regeneration (I am speculating here). Try clearing all of the DTC codes before driving again to see if that clears your issue.
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

estomax
Posts: 67
Joined: Fri Jan 20, 2017 9:23 pm
Delivery Date: 21 Jan 2017
Location: Seattle

Re: D mode stays on even while on B mode

Fri Jun 16, 2017 8:16 pm

so a small update after a week. i noticed this happened once more on a 60 mile drive at around 90% charge (at this point regen is fully functional usually), where regen in B mode was the same as D mode,, but the problem corrected itself later on in the drive around 60% battery charge remaining.

Today i noticed a different symptom, D and B modes behaved normally so i got more regen in B mode than D mode, but when i would use actual brakes, it would not add any extra regen, no matter the speed at which i do it (25+ mph braking always adds regen to max it out but it was not doing it today, it only scaled the regen as if i had my foot off the brake when i was coming to a stop).

wierd stuff.. i scanned the car again after clearing the codes last weekend:
Image

is stuff like this covered under the warranty? i am not sure i feel like paying to have this fixed but my car was first registered 12/2013 so it is a very late 2013 model. (mfg 11/13). it even has a 2014 paint code (tri coat pearl white).

I assume I have the original 12v battery so it could be that it is slowly dying, though the car sees the charger every day and has the solar panel which sees sun most days.

thanks,
Marko

Edit: quick look through user manual says replace VCM and then replace PDM after some diagnostic, didn't dig too much further into it but sounds like expensive dealer only replaceable stuff (vehicle control module or power delivery module).
Last edited by estomax on Sun Jun 18, 2017 8:05 am, edited 1 time in total.
2013 Leaf SL Premium
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LeftieBiker
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Re: D mode stays on even while on B mode

Fri Jun 16, 2017 8:51 pm

I didn't read back. Have you checked the 12 volt battery's rest voltage? Assuming it's ok, it looks to me like a control system error is popping up, and that should be covered over the EV system warranty - I think.
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

The most offensive, tasteless phrase in use here is "Pulled the trigger." I no longer respond to posts that use it.

estomax
Posts: 67
Joined: Fri Jan 20, 2017 9:23 pm
Delivery Date: 21 Jan 2017
Location: Seattle

Re: D mode stays on even while on B mode

Fri Jun 16, 2017 9:07 pm

just to clarify, rest voltage would be checked with the car powered off and not on the charger right?
2013 Leaf SL Premium
27k, 93% SoH, 2/17
32k, 96% SoH, 6/17

LeftieBiker
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Re: D mode stays on even while on B mode

Fri Jun 16, 2017 9:19 pm

estomax wrote:just to clarify, rest voltage would be checked with the car powered off and not on the charger right?


Yes. The best way to do it is to shut the car off after unlatching the hood (so you don't need to open the doors again) and after 15-60 minutes open the hood and check the 12 volt battery voltage. If it's under 12.4 that may be at least part of the problem. If it's 12.5 or better it's ok.
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

The most offensive, tasteless phrase in use here is "Pulled the trigger." I no longer respond to posts that use it.

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

Re: D mode stays on even while on B mode

Fri Jun 16, 2017 9:41 pm

Since the CAN Bus errors are just related to the EV system, I doubt that the problem is due to a low 12-volt battery, but check the 12-volt battery after charging the car and before driving. Release the hood and lock the doors before plugging in to charge. After charging is complete, unplug charger and wait 15 minutes. Measure the voltage at the terminals of the 12-volt battery with an accurate meter. I would replace the battery if it is not at least 12.4 volts. If the battery is good, let the dealer take care of it under the EV system warranty.
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

LeftieBiker
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Re: D mode stays on even while on B mode

Fri Jun 16, 2017 10:10 pm

If you want to catch errors due to a low 12 volt battery, then checking the rest voltage after charging may mask a marginal battery. Better to check the rest voltage after driving and before the next charge...?
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

The most offensive, tasteless phrase in use here is "Pulled the trigger." I no longer respond to posts that use it.

DaveinOlyWA
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Re: D mode stays on even while on B mode

Sat Jun 17, 2017 7:57 am

estomax wrote:Hey Guys,

i noticed this the last couple of times i drove my Leaf, but when i start with a full charge, then even in B mode it never actually goes to B mode once a little bit of battery wears off to allow more regen. i can switch between D and B and there is no regen difference at say 40 mph (while usually there should be a large difference). power cycling the car seems to fix this , but i was wondering if anyone else has noticed this?

cheers,
Marko



This is unusual since my B mode works all the time and I don't use D mode (unless in Cruise control which is very rare)
2011 SL; 44,598 miles. 2013 S; 44,840 miles. 2016 S30; 18,297 miles. 363 GIDs, Ahr 82.34, Hx; 100.00% kwh 28.1 QCs 165, L2's 190
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DaveinOlyWA
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Joined: Sat Apr 24, 2010 7:43 pm
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Re: D mode stays on even while on B mode

Sat Jun 17, 2017 8:01 am

jjeff wrote:Going off what gerryAZ said then, it sounds like you have a few cells that are a much higher SOC%(or voltage) than the rest, limiting your overall regen....not sure why this would be the case, other than if your battery is quite a bit out of balance. Do you regularly or have you lately charged your Leaf up to 100%? Apparently it should be fully charged occasionally to balance the individual cells, sounds like your pack is out of balance.


the reason is higher cells take on much more of the power than lower cells and lower cells discharge a greater amount than higher cells so its like burning the candle at both ends. This is why balance is so important.

remember your pack is only as good as its weakest cell
2011 SL; 44,598 miles. 2013 S; 44,840 miles. 2016 S30; 18,297 miles. 363 GIDs, Ahr 82.34, Hx; 100.00% kwh 28.1 QCs 165, L2's 190
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DaveinOlyWA
Gold Member
Posts: 11809
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 10 Nov 2016
Leaf Number: 314199
Location: Olympia, WA
Contact: Website

Re: D mode stays on even while on B mode

Sat Jun 17, 2017 8:03 am

estomax wrote:sorry, i think my post was unclear. At full charge this is expected, but i am noticing this when i am at 30% charge near the end of my trip this morning for example.

maybe i need to plug in with leaf spy and see if i have some unbalanced cells.. but my SOH is very high and i made a 63 mile trip this morning with 23 miles to spare when i got to my destination (80% interstate 60-65mph, albeit with some traffic here and there). just a strange gremlin in the software is what i think.


First off; you should edit your post for clarity because comments buried below often get missed. I always drive in B mode even at full charge. The level of regen will consider the SOC of the pack before it looks at what drive mode you are in.
2011 SL; 44,598 miles. 2013 S; 44,840 miles. 2016 S30; 18,297 miles. 363 GIDs, Ahr 82.34, Hx; 100.00% kwh 28.1 QCs 165, L2's 190
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