Rear Spoiler Deployment
 

Hi All
I am sure I am setting myself up for some fun comments - but have noticed my spoiler is not fully deploying. I drive a 991.2 C4 GTS. I noticed early on when the sunroof was tilted open the spoiler deployed more (instead of seeing a small portion in the rear view mirror - you could see almost the entire thing). This second stage is no longer happening with the sunroof tilted open. I noticed this after my 1st annual service about a month ago. I also noticed the other day that it did not fully retract when I came to a stop light - however it did retract as soon as I started to move when the light turned green.

There are no error messages. I am going to bring the car in. Has anyone had the same issue or have an idea of what it could be? Software? Would like to get some thoughts.

Spoiler function is dictated by a number of criteria; speed, sunroof status, coolant temp, etc. There isn't one definite setting for any given scenario.

The fully extended position when your sunroof is open only actives at a certain speed. Its possible you were below that speed, or you had only engaged the vent function vs. the open function. Open sunroof at 70mph should yield the spoiler to be in its most extended position.

As far as the spoiler not retracting at a stop, the spoiler often stays open to provide additional cooling when the coolant temperature is high. It probably remained open to maximize cooling and once the target temp was reached it retracted.

Thanks. I will do some more testing!

Let us know what you find. I have a 2017 C2S and I see the spoiler all the time, but how you have me curious, I'm going to try it with different sun roof positions. I had my car in for service and took a 2017 C4S home for 5 days and the whole time I could never see the spoiler, I thought it very odd.

Will do. There may be a difference in deployment with pasm v spasm. My car has spasm.

Thought I would contribute since I have recently thought of posting something about this.

I've seen comments which say that only cars with S-PASM have spoilers which automatically raise to the higher level. I have a 2014 C2 with non-S PASM and mine raises to the higher level. It doesn't seem consistent, though, as the OP mentioned. I haven't been around my car for a while and need more time to pin down what the criterion are more precisely but this shot was with the sunroof open and Sport Plus selected. The spoiler is clearly visible versus not at all in the mid-rise position.https://cimg8.ibsrv.net/gimg/rennlis...ae4f75c97e.jpg

I could never see the spoiler deployed on my 991.1S, even at high speeds above 75 (when I knew it was deployed). On my 991.2GTS, it goes up and down all the time and I can actually see it in the rear view mirror.

I went on a drive and dine a few months ago and the guy behind me on the drive asked if I kept raising and lowering my spoiler manually. I said no, it was all automatic. On the 991.2 it sure likes to move! :D

Same for me as @hbear. Picture is my normal deployment which I still see (thanks for that pic!). I'm still in a quest to get it to fully extent like it used too. Could not get out for testing this weekend. Hopefully some good heat, high speed and road time on July 4th...

As far as I am aware the spoiler only needs to extend to its highest position when the aerodynamics change of the car from the opening of the sunroof. The sunroof changes the airflow over the car and I am assuming increases the low pressure area behind the car which could make it unstable if the spoiler wasn't fully extended into its highest position. The highest position is probably not good for efficiency since its creating so much drag, so it doesn't make sense (as far as function) for it to be in that position at any other time. It would be kind of cool for track days, but I am assuming if it really assisted with traction at low speeds, the Sport (+) setting should include a fully extended spoiler position.

Since you cannot control its deployment in any capacity, I'm not sure why this is of such interest to everyone. Driving around I've seen them in multiple positions. I don't even know if there's only 3 position, there could be more. Its been very hot here and my spoiler has been deploying at 20mph regularly to help with cooling.

My only testing suggestion would be to perhaps run the car in Sport + and see if the spoiler extends further on hwy speeds.

And it works. Deploys to second stage (sunroof tilted) at 78mph. Picture attached.