Irabike
Posts: 2
Joined: Mon Apr 02, 2018 8:35 am
Delivery Date: 02 Apr 2018
Leaf Number: 311153

Faulty regenerative braking

Fri Dec 28, 2018 8:17 am

The regenerative braking has been cutting out and then back on randomly and my dealer’s diagnostic tool doesn’t show a problem. It is a 2017 Leaf with 10,000 miles.
Anyone else have or hear of this?
What would be my next step?
Thanks!
Ira

goldbrick
Posts: 636
Joined: Tue Aug 01, 2017 3:33 pm
Delivery Date: 01 Aug 2017
Leaf Number: 311806
Location: Boulder, CO

Re: Faulty regenerative braking

Fri Dec 28, 2018 11:40 am

I would get LeafSpy and have someone examine the readings when the car is not regenerating. It is probably not safe to do so while driving so get an assistant to ride with you.

One possible scenario is that the battery temperature sensors have intermittent faults and this is causing the BCM to reduce or disable regen. I think the regen is limited when the battery is cold so a faulty temperature reading could possibly cause regen issues. This assumes the faulty temp sensors don't set some sort of trouble code (or your dealer missed it...).

Of course, that is just a wild guess, so IMO the best approach would be to get as much real data as you can while the fault is occurring. The only way I know to do that is with Leaf Spy running while the regen is not working.

WetEV
Posts: 3219
Joined: Fri May 04, 2012 8:25 am
Delivery Date: 16 Feb 2014
Location: Near Seattle, WA

Re: Faulty regenerative braking

Fri Dec 28, 2018 5:06 pm

Irabike wrote:The regenerative braking has been cutting out and then back on randomly and my dealer’s diagnostic tool doesn’t show a problem. It is a 2017 Leaf with 10,000 miles.
Anyone else have or hear of this?
What would be my next step?
Thanks!
Ira
Regeneration cuts out if the tires slip. Ice on the road?
WetEV
#49
Most everything around here is wet during the rainy season. And the rainy season is long.
2012 Leaf SL Red (Totaled)
2014 Leaf SL Red
2019 eTron Blue

BrockWI
Posts: 799
Joined: Fri Mar 28, 2014 6:28 am
Delivery Date: 28 Mar 2014
Leaf Number: 423875
Location: Green Bay, WI.
Contact: Website

Re: Faulty regenerative braking

Fri Dec 28, 2018 7:00 pm

My first guess would also be snow. wet or icy roads. If it is not that take a peek at the regen bubbles and make sure all 4 are lit, if they are at least you can rule out something funky with the battery, if they sudden;y drop to 1 or 2 then just back to all 4 then something's not right.
3 kw solar pv - XW6048 - eight L16's
4 ton GSHP - 1 ton ASHP
2003 VW TDI 200k miles - 52 mpg lifetime
EVSE level 2 - Clipper Creek HSC-40
2013 S model with QC package Mar of 2013
lost first bar @ 72k
@90k miles - 54.71Ahr - 83.64SOH - 78.44Hx - 237GID

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