rogersleaf
Posts: 251
Joined: Sun May 18, 2014 7:50 pm
Delivery Date: 22 Mar 2019
Leaf Number: 307726
Location: Kent, Ohio

Re: Brief torque loss during acceleration, a potential life-threatening event.

Tue Jan 01, 2019 12:19 pm

DaveinOlyWA wrote:
rogersleaf wrote:If my memory doesn’t fail me, that module was north of $2k USD at the time. I do remember it was enough to convince me that I never want to own one of these outside of full warranty protection.


So not an EV specific issue then...

Not enough information was gathered at the time to determine if this module was specific to the LEAF, or common to other vehicles, or if Nissan was price gouging for the repair part (similar to the electric water pumps). Also not known is why the module failed, or how frequently this actually happens, or if the module is still being used in production. I do know the failure did not log any diagnostic codes, did not flash any ABS or traction control indicators (as suggested by others), and that their LEAF tech was directed by Nissan support to replace the module as if they knew of the problem.

The event was significant enough to make me think twice about buying off the lease. I called it Strike 1 at the time. Strike 2 was being turned away from getting a simple tire rotation 4 months later because their LEAF tech was on vacation. Strike 3 was the negative-equity financing with disappointing resale value. Came to the personal conclusion that this technology was too exotic, too dependent on dealer service, and thus affordability too shaky for the long term. Hope to have better luck the next time.
2014 SV - Brilliant Silver - returned 1/2017 at end of lease.
2019 SL - White - w/Tech Package

rduclos
Posts: 10
Joined: Sat Jul 08, 2017 9:17 pm
Delivery Date: 03 Jul 2015
Leaf Number: 336420
Location: Nova Scotia, Canada

Re: Brief torque loss during acceleration, a potential life-threatening event.

Tue Jan 01, 2019 8:37 pm

Thanks to all seven of you for monitoring this site and commenting on my post! Like you, I love my Leaf and regard it as near perfect for what I do, driving locally forty or fifty kilometers each day.

To cwerdna, Nubo, garsh and SageBrush, I don't think actual wheel slippage is involved, as the incidents took place on dry roads and I have the best Michelin winter tires with only twelve thousand Km logged on them, and correct 35-36 lb pressure. I might turn off Eco mode, though I normally never have a problem accelerating with it on.

To lkkms2, I think you may be right about temperature and aging, as the worst events happened with outside temp a few degrees below freezing and I don't recall any incidents during summer. The car has been driven through much colder weather in previous winters, however. I live more than 120 Km from the nearest Nissan dealer, which I can just reach in warm weather but would be difficult this time of year, so I will put off a dealer visit until summer, as the car still drives like new most of the time, and I will avoid rapid acceleration in traffic.

To DaveinOlyWA and garsh, I will monitor the VDC traction control as best I can during away-from-traffic tests, with it on and off. I didn't notice it during the very brief incident that led me to post my concerns, or earlier ones.

To rogersleaf, thanks for elaborating on your original post of 2015. I sure hope my Leaf doesn't have the same fault as yours did. Mine is owned, not leased, and hopefully still in warranty for this type of issue.

cwerdna
Posts: 9359
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: Brief torque loss during acceleration, a potential life-threatening event.

Tue Jan 01, 2019 8:45 pm

FWIW, if you truly believe there is a safety defect, you could report it to https://www.tc.gc.ca/eng/motorvehiclesa ... icles.html. If some repair is actually needed, might be better to do it after it's been resolved or an attempt has been made to resolve.

It won't give you any immediate satisfaction or may not result in any reimbursement, but could result in a recall.

'19 Bolt Premier
'13 Leaf SV w/premium package (owned)
'13 Leaf SV w/QC + LED & premium packages (lease over, car returned)

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

rduclos
Posts: 10
Joined: Sat Jul 08, 2017 9:17 pm
Delivery Date: 03 Jul 2015
Leaf Number: 336420
Location: Nova Scotia, Canada

Re: Brief torque loss during acceleration, a potential life-threatening event.

Tue Jan 01, 2019 9:06 pm

Thanks for the correct Canadian agency to report vehicle safety issues to, cwerdna. I have bookmarked it for possible future use.

DaveinOlyWA
Posts: 13870
Joined: Sat Apr 24, 2010 7:43 pm
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Leaf Number: 314199
Location: Olympia, WA
Contact: Website

Re: Brief torque loss during acceleration, a potential life-threatening event.

Thu Jan 03, 2019 10:02 am

Whatever you find out please update the original post and make a new post announcing the update. This will greatly enhance this site and reduce frustration
2011 SL; 44,598 miles. 2013 S; 44,840 miles.2016 S30 deceased. 29,413 miles. 2018 S40; 15,000 miles, 478 GIDs, 37.0 kwh 109.81 Ahr , SOH 94.61, Hx 120.15
My Blog; http://daveinolywa.blogspot.com" onclick="window.open(this.href);return false;

powersurge
Posts: 1335
Joined: Wed Oct 21, 2015 10:24 am
Delivery Date: 06 Dec 2014
Location: Long Island, NY

Re: Brief torque loss during acceleration, a potential life-threatening event.

Thu Jan 03, 2019 10:37 am

I don't understand how the original poster can definitively say that there is a model-wide safety issue with the car just because he has experienced a problem. He needs to take it to the distant Nissan dealer to look for problems and codes on the computer.

We should also not be encouraging him to report an unknown symptom to governmental offices about "defects"... I mean, just because any car might stall or stop does not mean that they are not "safe" (as a blanket statement).

What I think this boils down to is that people appear to have a love/hate relationship with their cars and are willing to pull the plug on their relationship with the vehicle if they have a problem.. I hope they are not like that in their relationships..

downeykp
Forum Supporter
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Re: Brief torque loss during acceleration, a potential life-threatening event.

Thu Jan 03, 2019 10:55 am

I have also experienced this in my 2011. It only happens while in eco mode. On a few different occasions from a stop I would need decent acceleration and would not get it. A bit scary but nothing that was not cured by shifting out of eco mode.

Have not had that experience in Drive. Acceleration has always been fine in Drive.
2011 Black Leaf SL+QC Vin. 1931
Res. 6-14-10 Order 1-25-11
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8 years 33000mi. 7 bars

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specialgreen
Posts: 227
Joined: Sun Mar 26, 2017 1:21 pm
Delivery Date: 26 Mar 2017
Location: Minnesota

Re: Brief torque loss during acceleration, a potential life-threatening event.

Thu Jan 03, 2019 10:42 pm

rogersleaf wrote:
rduclos wrote:While similar events were described four years ago at viewtopic.php?f=30&t=18849&start=10 , my recent experiences have seriously upset my faith in the safety of EVs. ... I am experiencing occasional random total loss of torque during rapid acceleration

The problem and link you referenced are from my posting a few years ago. Unfortunately I no longer have the car or the service paperwork describing the repair. The skinny on the malfunction is the power control system thinks the brakes are applied, thus blocking acceleration. I do remember it involved replacing an insanely expensive brake system module and some software updates.


Roger, in your post from 2015:
viewtopic.php?f=30&t=18849&start=10#p421769
...you mention an ABS module. I suspect that means this:
https://www.ebay.com/itm/2011-2012-2013 ... SwwVBblN5u
...about $150 used.

Other things that have been suggested:
- try pulling up on the brake pedal. If that ends the slow-motion start, then maybe the pedal is not coming all the way up by itself (per Arnis)
- try driving with traction control disabled (see viewtopic.php?f=38&t=24738 )
- One person said driving without ECO fixed something possibly similar (but may have just been referring to the strange way the accelerator responds with ECO)

cwerdna
Posts: 9359
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: Brief torque loss during acceleration, a potential life-threatening event.

Fri Jan 04, 2019 2:02 am

powersurge wrote:I don't understand how the original poster can definitively say that there is a model-wide safety issue with the car just because he has experienced a problem.

I don't think he ever said that nor is it EVER required that there be a "model-wide safety issue" to exist with a car in order to report a safety defect to a regulatory agency. Even when recalls happen, in many cases, not all vehicles are affected.

These example recalls affected a small portion of the vehicle population:
https://www.ft.com/content/347f7b7e-87d ... z4BXHp5RVS affected one vehicle.
https://transportevolved.com/2015/07/20 ... ng-recall/ affected 11 vehicles, 1 of them a Volt
https://www.autoblog.com/2013/12/12/chr ... ne-recall/ affected 522 units
https://www.cnet.com/roadshow/news/ford ... five-cars/ "Ford issues three recalls, two of which cover fewer than five cars"

My 06 Prius was recalled for a potential steering shaft problem. However, after inspection, it was not deemed affected.

Please look at pages 3 and 4 of https://static.nhtsa.gov/odi/rcl/2012/R ... 7-8546.pdf. Can you imagine if nobody reported the issues and it was just blown off? The NHSTA campaign id is 12V537000, if you want to do further digging at https://www.nhtsa.gov/vehicle/2006/TOYO ... WD#recalls. You can look under associated documents for each recall for sometimes interesting PDFs.
powersurge wrote:We should also not be encouraging him to report an unknown symptom to governmental offices about "defects"... I mean, just because any car might stall or stop does not mean that they are not "safe" (as a blanket statement).

I agree that in the case, since the vehicle hasn't been totalled in an accident yet, more can be done to investigate, attempt to repro and attempt to repair, if needed. This is why I wrote what I did.

As for the last part, if a car loses propulsion barring user error (e.g. running out of charge or fuel, incorrect operation of shifter or accelerator), those have become recalls. Google for name_of_automaker_here recalls stalling or name_of_automaker_here recalls may stop. Probably hundreds of millions of vehicles have been recalled worldwide for "stalling", for various reasons.

'19 Bolt Premier
'13 Leaf SV w/premium package (owned)
'13 Leaf SV w/QC + LED & premium packages (lease over, car returned)

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

rduclos
Posts: 10
Joined: Sat Jul 08, 2017 9:17 pm
Delivery Date: 03 Jul 2015
Leaf Number: 336420
Location: Nova Scotia, Canada

Re: Brief torque loss during acceleration, a potential life-threatening event.

Sun Jan 06, 2019 11:19 pm

by downeykp » Thu Jan 03, 2019 1:55 pm

I have also experienced this in my 2011. It only happens while in eco mode. On a few different occasions from a stop I would need decent acceleration and would not get it. A bit scary but nothing that was not cured by shifting out of eco mode.

Have not had that experience in Drive. Acceleration has always been fine in Drive.


That is very noteworthy, I will keep that in mind. Perhaps Eco is not intended for emergency-type accelerations.

I continue to drive my Leaf daily as before, and have not experienced any repeat of the behavior that led me to start this thread, even while still driving in Eco mode.

I think I over-dramatized the title of this thread with the "life-threatening" wording, but I don't think I can change that now (would mess up all the replies, unless the site programming can compensate for that).

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