Start/stop + Auto Handbrake Problem

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charles_M
Posts: 2
Joined: Tue Feb 11, 2020 11:41 am

Start/stop + Auto Handbrake Problem

Post by charles_M » Wed Feb 12, 2020 5:45 am

Hi everyone, new here.
Had a XC40 Inscription T4 AWD for 2 months now (in UK) ; I've found a few oddities and dislikes but overall a nice car and pretty happy.

However here's one problem I've experienced a few times, and can't seem to find any info.

If I have the auto handbrake engaged, which is a useful feature, and I'm stopped, e.g. at lights or slow traffic, the engine stops, so far so good.
But if the engine restarts after a certain time the car lurches forward, presumably having over ridden the auto handbrake, as it does when you simply pull away.

Obviously disconcerting, and I have to slam on the foot brake. I still use auto handbrake/parking brake now and again but with care.

Must be a fault which I'll report when I get round to it but I wondered if anyone else has experienced this?

Thanks
Charles

Ronnnie
Posts: 6
Joined: Fri Sep 21, 2018 9:45 am

Re: Start/stop + Auto Handbrake Problem

Post by Ronnnie » Sat Feb 15, 2020 7:05 pm

Hi
I think I'm right in saying.....if the engine is stopped by the stop/start function; then you must have your foot on the brake pedal, as soon as you lift your foot off the brake pedal the engine will auto-start, if your car is still in gear; the car will lurch forward, the system is designed that way.

hope this makes sense Ronnnie

Deleted User 2501

Re: Start/stop + Auto Handbrake Problem

Post by Deleted User 2501 » Sat Feb 15, 2020 8:15 pm

If the stop/start system has stopped the car, and you have the auto handbrake engaged there is no reason the car will start unless your put your foot on the accelerator.

You can tell if the auto handbrake/hold is engaged as the small switch near the handbrake switch will be lit up with a small green LED.

RONNIE - If you have auto handbrake active i.e. the green LED is lit there is no reason to have your foot on the brake during a stop.

charles_M
Posts: 2
Joined: Tue Feb 11, 2020 11:41 am

Re: Start/stop + Auto Handbrake Problem

Post by charles_M » Sun Feb 16, 2020 7:16 am

I can assure you that the engine restarts without my foot being on either the accelerator or the brake. It's happened a few times.

My previous Audi Q3 had auto start/stop, and the engine would restart when power demand was high, e.g. headlights, heating, demist etc.

I'm sure the XC40 would restart if the battery load was high.

Deleted User 2501

Re: Start/stop + Auto Handbrake Problem

Post by Deleted User 2501 » Sun Feb 16, 2020 8:49 am

That's a strange one then. If I have heavy load - heating mostly, the engine stop/start system doesn't make the engine stop until the cabin has heated. I've not had the situation where the engine has restarted mid-stop unless I've pressed the gas.
Is your green light lit as I explained?

Deleted User 2501

Re: Start/stop + Auto Handbrake Problem

Post by Deleted User 2501 » Sun Feb 16, 2020 9:06 am

One last thought as well as the auto-hold, as shown active by the green light on the button, do you ALSO have the auto-handbrake menu option on as well? This menu option will turn on the handbrake when the engine is turned off. It's a separate setting to the green light button.

It can be found as per the following extract from the manual;

Automatic parking brake activation setting. Choose whether the parking brake is to be activated automatically when the car is switched off.

To change setting:

Tap on Settings in the centre display's top view.

Press My CarParking Brake and Suspension to select or deselect the function Auto Activate Parking Brake.

Paulinyork
Posts: 40
Joined: Tue Nov 12, 2019 12:07 pm
Location: Uk

Re: Start/stop + Auto Handbrake Problem

Post by Paulinyork » Sun Feb 16, 2020 9:14 am

I have noticed the engine restart whilst the auto hold handbrake is on. However the car doesn't lurch forward. The engine starts.. Drive is obviously engaged as there is a little forward momentum but its held by the handbrake. The car itself doesn't move a millimetre. The car will only disengage the handbrake once I touch the accelerator.

In your case it does sound as though there could well be a fault if you have ruled out everything else, such as resting your foot on the accelerator or anything like that.

Good luck with it.
T4 FWD R Design in Thunder Grey. Winter Pack, Reversing Camera.
Christ, Options are expensive!!

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