Wow, at least someone's sorted :thumbs: Well done Col, had never even heard of that. Will deffo investigate that.

Brown wire yea that's it :thumbs: had me confused for ages how it would work then suddenly go off, about 4 months before I realised it was only when I put the stereo front on

brown wire :cool: finally sorted mine, thanks for the advice :)

Not sure what colour was and no on stereo side of loom

any idea what colour the wire is? and i presume its on the car side of the loom?

If it has an aftermarket hu they have a sensor wire that increases the sound with speed, if this is not connected as I don't think they work in vx anyway it may be touching the cage intermittently which would cause the speedo needle to drop, know from experience In my old mk4 Astra, worth a look

Clean connectors, on the car side plug and the dials.

Also be worth checking the plug is secure in the dash.

If not, speedo sensor.

Take the dash panel out and clean the connections in the plug. Should sort it.

mines been doing this lately. normally only does it when a drastic increase in speed whereas if you build your speed up gradually its fine lol

Chances are it's electric in the C.

Hitting the dash would suggest a loose connection.

Otherwise i'd have thought the sender in the box was on way out.

i'm having a very similar problem with my mk4 astra, driving me insane, can't get to the bottom of it!

...been told when it stops if you start smacking the dash then it comes back on? :lol: I'm guessing it could just be the cable to the back of the clocks then rather than at gearbox end?

Not my car, but help appreciated..

1.2 Corsa C

Works fine, but occassionally when driving the speedo will just drop down back to zero and stop working, but then pick back up again randomly.

Where should I start?

Cheers