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?catastrophic transmission failure?

Posted: Fri Mar 08, 2019 4:57 pm
by hutch
The problem has been coming on over the past few weeks--when I pressed the accelerator, there was a delay 'till the car "chunked" into drive, and when I put it in park it would creep a foot or so before halting abruptly. Now my 2012 Leaf won't move, and I can hear the motor spinning. I can't find any reference to this problem online, and of course the local dealer hasn't seen it before, since they've hardly seen a Leaf before. I live in the mountains, and need to figure out if this is worth the $500 tow bill just to find out if the car will need it's whole value in repair.

Re: ?catastrophic transmission failure?

Posted: Fri Mar 08, 2019 6:41 pm
by LeftieBiker
Yikes. There is no "transmission" in the usual sense, just a reduction gear and presumably some kind of differential, or something that functions as one. I can't think of a failure that would let the car move, but only a little. I'm guessing it's the drive motor that has issues...

Re: ?catastrophic transmission failure?

Posted: Sat Mar 09, 2019 6:19 am
by jjeff
Just a WAG but could it be something stuck in the electric parking brake? I guess to test you could put it in neutral on a flat area and see if you could push the car, I suppose you could also jack it up and see if all wheels easily spin?? Like Leftie I haven't read of anyone having a similar problem so I'm just grasping at straws.
Oh, any error lights on the dash?

Re: ?catastrophic transmission failure?

Posted: Fri Jul 19, 2019 5:28 pm
by BlazinGuns
Any update on this?

Re: ?catastrophic transmission failure?

Posted: Tue Jul 23, 2019 6:47 am
by estomax
a cheap test would be to drain the transmission fluid out and see if chunks/metal comes out of there. That would confirm something screwed in the transmission. If the fluid comes out looking alright then just put fresh fluid in and you can say that wasn't the problem. There is a how-to here if you search my username.

Marko

Re: ?catastrophic transmission failure?

Posted: Tue Jul 23, 2019 7:49 am
by Lothsahn
estomax wrote:a cheap test would be to drain the transmission fluid out and see if chunks/metal comes out of there. That would confirm something screwed in the transmission. If the fluid comes out looking alright then just put fresh fluid in and you can say that wasn't the problem. There is a how-to here if you search my username.

Marko
If you want to do this, the Leaf doesn't actually have a transmission, it has a gearbox (fixed gear--no shifting). So the process you want done is to change the gearbox reduction oil, and check to see if there are metal bits in the oil.

Keep in mind that some small metal shavings are expected in the gearbox reduction oil (there's a collection magnet), but certainly not chunks or parts. If you can read a part number, you've got a problem. ;)

Re: ?catastrophic transmission failure?

Posted: Tue Jul 23, 2019 3:01 pm
by Nubo
LeftieBiker wrote:Yikes. There is no "transmission" in the usual sense, just a reduction gear and presumably some kind of differential, or something that functions as one. I can't think of a failure that would let the car move, but only a little. I'm guessing it's the drive motor that has issues...
A couple of broken teeth on the driven gear?

Re: ?catastrophic transmission failure?

Posted: Tue Jul 23, 2019 8:00 pm
by LeftieBiker
Nubo wrote:
LeftieBiker wrote:Yikes. There is no "transmission" in the usual sense, just a reduction gear and presumably some kind of differential, or something that functions as one. I can't think of a failure that would let the car move, but only a little. I'm guessing it's the drive motor that has issues...
A couple of broken teeth on the driven gear?
Maybe, I guess...

Re: ?catastrophic transmission failure?

Posted: Wed Jul 24, 2019 9:06 pm
by GerryAZ
You might be able to get the car to move under power by pushing it a couple of feet. That would move the driven gear so that good teeth would be in contact with the drive gear (if failure is due to broken teeth). As others have mentioned, reduction gear oil change would give some information. Drain and fill plugs have magnets which normally collect fine metal shavings that almost look like metal paste. Large pieces of metal on the magnets or in the drained oil would confirm failure.

Re: ?catastrophic transmission failure?

Posted: Fri Jul 26, 2019 6:08 am
by gregn
Hi all,
Dose the dash indicate the position of the gear selector? P D R or N for neutral?
If not I would suspect the gear selector switch.
Greg