AKawasaki

Colleagues,
I’m still get orientated to my 2018MY C4GTS that has a manual transmission. One area of question or concern that I have is the Hold function.

The manual states that inclines >5% (>3 degrees) will activate the Hold function. I am experiencing random activation, more often not activating and if it does activate it is generally at very steep angles that far exceed the referenced minimal incline.

I took it it to the dealership who briefly checked it out and saw no issue or warning lights or other. Annoyingly, the function worked properly in the parking lot when I was parking on an incline. They also openly admitted the manual is not reliable and that the activation incline/angle is much higher. They also said it is not perfect and somewhat finicky.

Have you had consistent functioning of the Hold function? I will be “testing” this out more thoroughly on some hills and steep hills this weekend. And if not consistent plan to take it back to the dealership for a more thorough diagnostic.

Any my constructive feedback is greatly appreciated. Still loving living my 40 year old dream with this car.

Needsdecaf

Your operation sounds about normal to me. Of course, not many hills here in Houston!

subshooter

I have a 2018 manual. I think it works pretty well. I agree it seems much higher than 3 degrees before it activates though.

seapar

I have a 2016 GT4. Works on the Seattle hills just fine.

Boulder Mike

Interesting. I’ve been wondering the same thing. My bmw seemed to always activate at the right time but can’t say the Porsche has activated once in 1300 miles. In fact I assumed this option was not on the Porsche MT cars. Please report back. I’ll have to be more purposeful and do some testing myself. Is this feature standard on all .2 cars and was it on .1 cars (my previous.1 was PDK)? Thx.

R_Rated

I have this on all of my cars and it scares me to trust technology when I think I should be accountable for holding the break!

OP - I bet this could be a nice feature though on a manual when you need to rest your leg for a second.

kyrocks

I think it comes on at a bit higher than 3 degrees. It works on steep hills and that’s all you need. I wouldn’t sweat it. I would forget about it. You don’t need the function anyways.

AKawasaki

Thank you everyone for your comments.

I just returned from my “test” and it appears the Hold function does work, but for my car on inclines/angles much more than the user manual’s claim of 5% (3 degrees) I found it more consistently works at angles closer to 20 degrees or more.

To to one of the prior comments, I have since learned to not rely on this Hold function as a result of previously rolling back and almost tapping a pick-up behind me on what was clearly an incline that was greater than 5%.

Having driven manuals for years, and thus being my first car with thus function, I thought/assumes this was an absolute assist function. Learned something new today and from your comments. Thanks again everyone.

n2cars

2016 here. Hold function works perfectly. I actually like it. I wonder if some owners don't know how to activate it?

mb1

I seem to remember reading that it won’t activate in sport mode. May explain why it doesn’t activate for some individuals. Mine seems inconsistent, but I have no objective data.

Homeles

I wish I could turn it off, permanently.

2001f4s

I found it takes some getting used to. Been driving manual trans for many years, and have never stalled a car more than this one. You definitely need to give it more throttle on the starts on hills from a stop, than you might be used to.

Gordon Shumway

I think part of the problem is you are underestimating just how much of a grade 5% really is. Case in point is your reference to only working when angles are about 20 degrees. The acknowledged steepest street in the world is a 19 degree angle, which equates to a 35% grade. Were you really on hills that steep for your testing?

Think of those times you were coming down a steep hill, or out of the mountains where there is a warning sign that says: Warning 7% grade for the next 5 miles, and remember how steep that was. A 5% grade is not insignificant.

verstraete

The hill holder function is only intended to prevent rolling backward during the very short time interval between brake release and clutch grab when starting off on a hill. When I first started driving my MT 911.1 in 2013, in hilly NE PA, I found it difficult to adjust to after many years of using a manual hand brake to carry out the same function. Now, with my MT 991.2, I don't even think about it. The hill holder operates and I start on hills without difficulty. I don't notice any difference in its function on the 991.2, as compared to the 991.1.

subshooter

I agree completely. I was going to do the math to calculate what grade a 20 degree angle would have but I think your summation nails it. I don't think there is anything wrong with the OP's hill hold. I really like it. I have it on both of my manual Porsches.....but I have stalled them both a couple of times.