AT downshift issue
 

Hi first issue post,

Occasionally when going into manual mode and then going for a downshift the transmission doesn't rev match it lurches a bit then downshifts into the correct gear and the engine slowly revs up. Also in the same tense it will lurch in the upshift. This issue continues until I restart the car at which point the problem completely disappears

I've had this same issue. No solution. Dont know what causes it. Sometimes those downshifts are scary

I've experienced the same issue, probably three times since owning the car for a year. Harsh upshifts and laggy/non rev match downshifts. Restarting the car does make it go away, the other solution was to put in back in "D" and drive for a few miles.

Hmm. I don't think I've ever experienced a laggy or non-rev matched downshift in my automatic, but I can definitely can speak on harsh upshifts, especially 1st-->2nd. My car, at least until its fully warmed, has always been kinda harsh from 1st-->2nd.

Always happens to me after the car is warm. No way to fix except turn it off and let it cool down

I have these types of issues, but it is always so intermittent it is hard to actually replicate and understand.

My feeling is that perhaps I will get a tranny flush (been on the OEM fluid, never changed and now at 56000 km) and maybe that will rectify it

I keep meaning to go to the dealer, but like you said, sometimes it's quite intermittent, and I don't want to go to the dealer, bitching and moaning and not have the problem replicate itself.

Not sure if it's a fluid issue though, it's happened to me since the break in period. And I have less than 9000km on my car.

Interesting discussion. I've got over 61,000miles on mine probably about 25% driven in manual, and almost every trip with some paddle action, and have not experienced this.

Its very specific and hard to describe, I could flog the car for an entire drive and not have any issues and the car runs perfectly. But then the next day after driving normally and switching to manual it would behave this way and its only happened twice. I'm not sure where its stemming from but it seems like some sort of software bug?

Thank YOU! I finally don't feel scared :lol: Nice to know its not just me, I really do think its a software issue, it happened only twice so far and the second time it was after driving the car totally normally then having the urge to go manual, and it just would scare the shit out of me when it would throw it self down a gear without a rev match

Probably software related. But like I mentioned, don't want to go to the dealer complaining about not rev matching, and have them not be able to replicate it.

Recorded the issue hopefully you can use it and just say it happens to yours as well:
https://youtu.be/A0knWVHLtX0

This oil change I'll bring it up, notice the wheels sqeak when the downshift happens I hope nothing is locking up and its just the sudden deceleration

The wheels squeak on me when the issue happens as well

Hmmm I've never felt that after 57000 km

Bad batch of ATs on our part?

I never had this type of issue... only issue was when it downshifts, it doesn't make an aggressive downshift noise.

I've had this happen a couple times as well. I haven't noticed any pattern to it. I'm guessing it's a bug in the ECU.

I've noticed it happens for me only if I drive "normally" from the get go

I emailed my dealer yesterday and explained what was happening, but he said it definitely shouldn't be doing it. He told me to bring it in at some point this week. Then I followed that up with your video and told him my car does the same thing. Have yet to hear back about that, but at least I'm not being brushed off, so that makes me happy.

Get in touch with your dealership and see what they say!

I've only had a rev dip in 3rd or 4th and only after dropping down 2 gears quickly in manual mode. And only sometimes. It's as if the software can't decide what it wants to do sometimes...

In manual mode, are you WOT between shifts? That could create a large sudden change in acceleration, or "jerk" if the automatic transmission is just not fast enough, caused by the wheels operating at a speed different to what the car is actually moving at.

Driving a manual, you quickly learn how to not create a large "jerk" between shifts by releasing most or all of the throttle when shifting up and applying enough throttle for rev-matching for downshifts.

I have never driven an automatic BRZ.

Nope I've driven manual before its this is just a really slow downshift and lack of any sort of rev match and its regardless of wot or not, you've come to the thread a little late lol

WOT has no issues whatsoever. Just completed a track day yesterday and no weirdness

I'll try and get in touch but the problem is my schedules getting busy with work and school :iono: and not having a car for even a day would be a problem. Please do us a favor and post here what your dealer finds
Also the issue is becoming increasingly more common

Update: although it's memorial day weekend I contacted them via email and will wait for a response on Tuesday, hopefully they can reproduce this otherwise I will ask to take a tech out on a drive

i second this. i have not had the same problem as described above but i know that if i change my throttle input during any part of the shift the engine and transmission get a little confused

Problem is this occurs without any throttle input....

Appointment set for Friday they've scheduled a technician to drive the car for 45 minutes and try to reproduce the issue, either that or do doughnuts in my car.....

Did you see your dealer yet? I won't find anything out till Friday

Car is going in tomorrow.

For me at least today I've noticed shifting has become quite rough in manual mode not sure why

Slush box sh!t
 

Any of my slush issues were cured with ENEOS tranny fluid.

Tracking causes a grumpy tranny. Top ups didn't work, a complete flush with ENEOS and it was shifting faster and smoother than new.

A complete flush and refill every season with ENEOS like our Nippon brothers use and all is well fer me -

A slush box tranny fluid cooler is a MUST for the track, (the juice lasts longer) -


:happyanim:

Not the issue but I will upgrade the fluid at some point

@Bergen23 Did your dealership solve the mystery? Or are they stumped I really really hope this is reproducible for mine.

Salesman took it for a 15 minute drive, problem didn't show up. They're going to have the car for a few weeks, so hopefully it turns up.

I think I'll tell my technician do drive it several cycles repeatedly it didn't appear at all today interestingly enough

Update: Code P0700 has appeared, and the issue is very similiar to this:http://www.ft86club.com/forums/showthread.php?p=1625331


I believe a new TCM or ECU is in our future @Bergen23

Good to hear you got it resolved. No cel for me, but was the code something they pulled, or did it show up during them scanning for something?

I found it when using my oft and I have told them about it

Well, that CEL always comes on after a flash, so that probably isn't actually the problem.

After 2 drives, the dealership still hasn't replicated the problem, so I don't think they're going to be doing much about it.