Rolling down inclination while on Drive mode

Rolling down inclination while on Drive mode

This evening, I have discovered something interesting about Tesla model S. I parked my car outside the garage with probably 10-15 degree inclination. I started my car, attempted to drive into my garage. While shifting it to Drive mode, but not having my foot on accelerator pedal, the car slowly rolled down hill, away from my garage. If I pressed on accelerator pedal or the brake, then it stopped rolling down.

I wonder anyone driving in San Francisco have similar experience.

David Trushin | July 3, 2013

Unless you have creep enabled the car will behave like a standard transmission car in neutral when stopped. Creep will cause forward force against the hill.

tobi_ger | July 3, 2013

I'm wondering if that could be changed by a firmware upgrade to prevent rolling backwards while in D mode. That's what I'm used from autom. transmissions; could be labelled a security feature upgrade.

jjaeger | July 3, 2013

Creep provides very limited force against a hill. It approximates an ICE very well. Small inclinations it makes a difference, anything of note and you roll like an ICE would w/o any accelerator to counteract. All my SF city drives are like any ICE - use the brake to hold and enjoy the instant acceleration to prevent roll-back when changing from stop to go.

tobi_ger | July 3, 2013

with manual shifting that's true, but so far my experience with autom.transmissions has been, that with D you do not roll back (which I would prefer regardless of creep mode).

ian | July 3, 2013

Sounds like this should be called a Hill Holder mode. Subaru's (others too?) used to have a hill hold on their manual transmissions to make starting on a hill easier on the clutch.

Or you could just use your left foot on the brake until you get going.

William G. | July 3, 2013

Hi everyone, I have been having the same happen to me since I got my model s last Saturday, took a little to get used to but many cars have the ability to not roll back. My x3 and x5 didn't have that roll back.
Not sure if Tesla is able to do anything about it, but if they can that would be great so you don't have to roll back into a car like on Stockton between pine and bush, Webster or other steep streets.

Tesla - thoughts?

Flaninacupboard | July 4, 2013

If they did that wouldn't people rely on it instead of putting the car in Park? It would be using power to stall the motor constantly, and that's not really a good thing. A specific "Hill hold" function would probably be better, where you put the brake pedal to the floor while stationary and it will keep the brakes engaged until it detects an accelerator input.

tobi_ger | July 4, 2013

However this "hill hold" function is achieved (electronically or mechanically), it's fair to say a car should not roll backwards when in drive mode, ever.

cfOH | July 4, 2013

I don't understand the problem. Does it take too long to move your foot from the brake pedal to the accelerator pedal?

herkimer | July 4, 2013

It is not difficult to use consistent pressure on go pedal to hold, or to use left foot to brake until accel picks up. So far I have not had any problems rolling back on hills.

tobi_ger | July 4, 2013

I do know how to use the breaks, sure. ;)
Since the creep mode came after requests, I thought this was in the same league of ideas. I'd label it as a security feature, but many seem to see it differently, just a convenience thing, no problem.
Since I had it in several cars with automatic transmission, I assumed that this was somewhat a standard nowadays (not for stick shifts), my mistake.

ajrdu | July 4, 2013

Many manual transmissions have a hill-holding function. The car simply applies the brakes for 1.5 seconds or so after the pedal is released if the car is on an incline. The function cancels when you hit the accelerator.

July10Models | July 4, 2013

The car has an electronic brake which can be activated from the 17 inch display. This fact alone means that it is real easy for a hill hold to be implemented. I have tried the brake on the screen, it works just like a manual emergency brake albeit placing the car in neutral in the process. Alternatively also from the push button at the end of the shift lever but again leaving the car in neutral. I do not drive with creep on so I have to feather the goose pedal to hill hold. The positive side of this is instant go when the light changes to green, get other drivers to squeeze their brakes as you creep backwards on an incline :-) The negative thing is if you are not paying attention, pedestrian crossing behind the car may get branded with the Tesla logo. Yeah, Tesla should implement a hill hold for people who really wants it after all this car is all about options. The car is a lot of fun to drive for me. I would activate this option for valets and my SO.

Brian H | July 4, 2013

Just tolerate/ignore the car's objections to pressing both pedals at once.

negarholger | July 4, 2013

Actually hill hold on the MS is super simple - just use the accelerator, the electric motor can hold the car with ease. The accelerator control is so fine ( never possible with any ICE - too rough ) that you can keep the car still even on the steepest hills in San Francisco. My wife was practicing it last weekend in SF and just loves it, she mastered it after 2 hills. Remember the MS is one pedal driving... all the stuff you learned for your ICE is history.
Disclaimer - in the beginning I was irritated by the torque hole when you are rolling backwards and then go forwards, but after a little practice the MS is by far the easiest car to tackle a stop at inclines. Just a little practice of one pedal driving.

mikefa | July 4, 2013

Yes we definitely need a Stronger and More Powerful "CREEP" or a "POWER CRAWL" to prevent the Model S from rolling backwards while stopping and going on a sharp incline.

olanmills | July 5, 2013

Why is this weird? Even my old automatic transmission ICE car would roll downhill in the opposite direction of the gear selected if the hill was steep enough.

JaneW | July 7, 2013

MS has a hill hold. It's called the accelerator pedal.
You oughta try handling hills in my 1999 m-coupe!