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-   -   991.2 GTS Rear Axle Steering issues (https://rennlist.com/forums/991/1065563-991-2-gts-rear-axle-steering-issues.html)

macanakey 04-25-2018 10:09 AM

991.2 GTS Rear Axle Steering issues
 
The Hubster was driving our GTS about 3 weeks ago & when he pulled out of our office, his dashboard lit up like a Christmas tree & he got an error message about his rear axle steering being disabled. The system also disabled park distance control, ABS & lane change systems. Car was flat-bedded to the dealer, who thought that there was a wheel sensor issue, but couldn't find any other problems & reflashed the ECU. Same thing happened again yesterday, as he made a u-turn out of our office. We'll get the car in again, but are wondering if anyone else has experienced the same & how they got it fixed.

As an FYI, vehicle was purchased new last summer & has about 3500 miles on it.

PorscheFrank 04-25-2018 10:13 AM

Interesting. Never had any issue like that was my a GTS with RAS. Good luck.

DMoore 04-25-2018 11:11 AM

Same issue GT3
 
I gad same symptoms in my GT3 a couple of months ago. Wheel bearing was leaking grease which got into wheel speed sensor. I had all sorts of errors including rear steering. ( it was a front wheel bearing, BTW). Fix was to replace bearing and sensor.

DMoore
18 991.2 GTS
18 Panamera Turbo Sport Turismo

macanakey 04-25-2018 02:54 PM

Thanks for the info. Will have to mention that to the dealer. Hope it's that minor an issue for us, too.

chuck911 04-25-2018 09:05 PM


Originally Posted by DMoore (Post 14966325)
I gad same symptoms in my GT3 a couple of months ago. Wheel bearing was leaking grease which got into wheel speed sensor. I had all sorts of errors including rear steering. ( it was a front wheel bearing, BTW). Fix was to replace bearing and sensor.

DMoore
18 991.2 GTS
18 Panamera Turbo Sport Turismo

Just how hot does wheel bearing grease have to get to flow like that? :rockon:

991.2GTS 04-25-2018 09:31 PM

I got the same issue couple days ago. After couple mins those lights were off but the engine lights went on. Brought it back to dealer and they said I need to leave the car there for at least a week. So let's see what happened. My car has 7000km on it.

DMoore 04-27-2018 05:55 PM


Originally Posted by chuck911 (Post 14967840)
Just how hot does wheel bearing grease have to get to flow like that? :rockon:

I did mention "GT3" right? Many track days. At favorite track (Fontana, CA) lap includes turn 3 - 140 mph down to 35 and turn 13 - 130 to 35 - on every lap. Usually 10 to 11 laps per session. I've seen tire pressures go up by 10 psi in a session. So yeah... things get warm!

DMoore
'18 Panamera Turbo Sport Turismo
'18 991.2 GTS (delivery tomorrow)
991 GT3 (until a month ago)

_RS_ 04-27-2018 08:27 PM

(flat though turns 1 & 2 ?)

Rapter 04-27-2018 08:33 PM


Originally Posted by DMoore
I did mention "GT3" right? Many track days. At favorite track (Fontana, CA) lap includes turn 3 - 140 mph down to 35 and turn 13 - 130 to 35 - on every lap. Usually 10 to 11 laps per session. I've seen tire pressures go up by 10 psi in a session. So yeah... things get warm!

DMoore
'18 Panamera Turbo Sport Turismo
'18 991.2 GTS (delivery tomorrow)
991 GT3 (until a month ago)

Sick!

If there ever was a way to cause a fault in manufacturing of products is to use them at full potential !

Love what I just read.

DMoore 04-28-2018 01:20 AM


Originally Posted by _RS_ (Post 14972639)
(flat though turns 1 & 2 ?)

no, not quite. Enter 1 around 155; let it off a little to 135ish, then accelerate out to 140. Brake HARD for 3. Never had the nerve (or enough downforce) to keep it flat all the way around. Actually got a little 4 wheel drift once around 137 in 2.
Don't expect to see those speeds in my new GTS.
DMoore
991.1 GT3 until recently
991.2 GTS ... picking up later today!

arter 04-28-2018 12:51 PM


Originally Posted by DMoore (Post 14973042)


no, not quite. Enter 1 around 155; let it off a little to 135ish, then accelerate out to 140. Brake HARD for 3. Never had the nerve (or enough downforce) to keep it flat all the way around. Actually got a little 4 wheel drift once around 137 in 2.
Don't expect to see those speeds in my new GTS.
DMoore
991.1 GT3 until recently
991.2 GTS ... picking up later today!

I think you will be surprized that you can run as fast in a 991.2 GTS as you did in your GT3 on fontana.....

chuck911 04-28-2018 02:04 PM


Originally Posted by DMoore (Post 14972360)


I did mention "GT3" right? Many track days. At favorite track (Fontana, CA) lap includes turn 3 - 140 mph down to 35 and turn 13 - 130 to 35 - on every lap. Usually 10 to 11 laps per session. I've seen tire pressures go up by 10 psi in a session. So yeah... things get warm!

DMoore
'18 Panamera Turbo Sport Turismo
'18 991.2 GTS (delivery tomorrow)
991 GT3 (until a month ago)

Its funny because whenever we look at a wheel bearing the grease is just thick as can be. Its hard to imagine what it must be like when the car is turning 150 and the brakes have heated that grease to 200 degrees or more. At high temp the grease probably behaves more like oil. Now imagine this wheel bearing turning 2018 rpm! (Which according to my quick calculations is what your wheel is turning at 150 mph.) It was at first hard to imagine wheel bearing grease ever flowing out of the hub. Under the reality of these conditions, not so much. Kind of like watching one of those high speed videos of a valve spring. At high rpm the spring and seats, so fixed at rest, float and rotate like an air-hockey puck. Crazy!

m5biemer 05-03-2018 12:36 PM

Update--drove it around the next day with the check engine light on, cluster stated driving was okay. Park distance and lane keep were functioning properly as well as RAS. The very next day when I started it up, no more check engine light and it's been fine ever since. Definitely a strange occurrence.

drcollie 05-04-2018 09:00 AM

The more complex you make a vehicle, the more potential failure areas. I had a Dynamic Engine Mount go bad on my 991, under warranty. Dealer indicated that would have been $ 2K to replace outside of warranty. Do I really need them? Probably not any more than I need Rear Axle Steering. Just a point to note when checking of the option boxes - or buy the way-far-out extended warranty.

991.2GTS 05-04-2018 03:59 PM

We basically experienced the exact same thing. I still dropped off my car at dealer since I will have a couple hours long drive next week and I don't want to stall in the middle of the road. However, I called this morning and they said they still didn't know what happened which is weird.


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