Thread: DSC towing problem

Check tyre pressures of both car and trailer as well. I found my D3 DSC to be a lot more sensitive than the D4 DSC when towing. The D3 would trigger very easily.

Argg. I didn't realise it stops auto suspension height. Does this mean you also can't manually select off-road height?

Just about to embark on a trip in a week's time. Better pull the camper out for a full test to see what the heck I don't know.

Originally Posted by Markus1

Argg. I didn't realise it stops auto suspension height. Does this mean you also can't manually select off-road height?

You can select off-road high no problem. Its the thing when you select Mud/Ruts etc and it automatically puts in in off-road for you that is suppressed when a trailer is attached.

Originally Posted by Markus1

Argg. I didn't realise it stops auto suspension height. Does this mean you also can't manually select off-road height?

Just about to embark on a trip in a week's time. Better pull the camper out for a full test to see what the heck I don't know.

You misunderstand. It will let you MANUALLY select any mode. It will also re-level itself when the weight of the van is added or subtracted. What it won’t do is AUTOMATICALLY select extended height when you enable ‘rock crawl’ (which is the default mode of operation) according to the post above. This is actually new to me as I’ve not noticed this.

Thanks DJ. Blood pressure just dropped 10 points.

Originally Posted by DiscoJeffster

What it won’t do is AUTOMATICALLY select extended height when you enable ‘rock crawl’

Off-road height, not extended height. Extended height is when the vehicle becomes grounded then super-extended height when the brake pedal is used to go higher still.

The OP's D3 has a problem going uphill but that may be unrelated to his DSC activating.

As Graeme said, DSC operating in corners to stabilise the car is what it is designed to do. With your caravan on it is activating as necessary due to extra loads put on the car. You may find that the front wheels are tending to lose grip both in acceleration and cornering, which will cause DSC to activate and stabilise things.

The issue of the errors when towing up hill is not the DSC. It is some sort of problem putting the car into restricted performance mode, as evidenced by the warning messages. It is not DSC that causes that.

Originally Posted by Graeme

It does not cancel auto levelling, only auto height change to off-road height for those modes where off-road height is normally auto selected. Auto levelling is why air suspension is so beneficial when towing.

To clarify my comment Graeme. My understanding is that with a trailer connected correctly, the AS will not autolevel once the car is stopped and doors are closed, as it tends to do during normal non towing driving.

During normal towing, the car does autolevel, you are right.

Suspension height selection still works, albeit manual selection.

I've tested this by leaving the umbilical disconnected so that the car doesn't "know" it's towing, when stopped and all doors are closed, the car auto levels. Plug the umbilical in, the dash indicator flashes, drive a bit then stop, the car does not autolevel.