Door automatically unlocks when the car’s in motion: What’s the reason?

I had reported this problem to the VW Service Center during the annual servicing but the engineer didn’t find anything wrong with the car.

BHPian durvient recently shared this with other enthusiasts.

Hi Guys, yesterday my car’s door automatically unlocked while the car was in motion forcing me to lock it manually however the unlocking kept happening at infrequent intervals.

The frequency is associated with bad/bumpy roads, never on a smooth pothole-less road.

This issue had happened only once, 3 months ago and never surfaced again until yesterday.

I have checked for error codes but there aren’t any, scan with VCDS is pending until I return to my home.

I had reported this problem to the VW Service Center during the annual servicing but the engineer didn’t find anything wrong with the car. Anyone else faced this issue or know what might be wrong and how to fix it?

Here’s what GTO had to say on the matter:

Used to happen on our C-Class whenever the car hit a really bad pothole at speed. Mercedes dealer said the sensor that unlocks all doors in case of a crash was getting triggered.

Here’s what BHPian shancz had to say on the matter:

Sounds like a loose connection/contact in the central locking system or any of the door locks. Hope it didn’t have a water ingress event.

VCDS might/might not be as effective as reproducing it with an ASC technician on board.

I expect the ignition switch to last the lifetime of the car and I haven’t heard of any such failures but this could be the first.

I haven’t used VCDS but would suggest doubling-check that the ignition switch error isn’t the result of some other issue like a faulty/damaged sensor or its connecting wiring.

  • Could it be due to a faulty/low battery keyfob? Since the unlocking doesn’t happen it could either be due to a faulty switch or a faulty keyfob.
  • Have the car battery checked for proper voltage too, I have seen a lot of weird issues being traced down to a failing battery.

I would also like to suggest adding some info about your car in case someone else can be of help with more accurate info. Like car model/year, does it have a push button start or not etc.

Keep us posted.

BHPian durvient provides an update on his issue:

Scanned with VCDS again! Turns out the ignition switch has gone bad and causing the issue. Trying to source the switch and find out how it goes.

The unlocking isn’t happening anymore but another issue came up the doors aren’t unlocking automatically upon removing the keys which seems to be due to the faulty ignition switch.

Check out BHPian comments for more insights and information.

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