I've seen it twice on my car and on both occasions, all it needed was for it to sit in ACC mode for about 10 mins, then restart the car and go for a drive around the block. On both occasions, that did the trick.
thats what Peugeot Assistance told me to do also ........ and it worked the first time. so i headed off, but only made it as far as James Ruse drive ... and the speedo was on 90 then 80,70,60 ... zero ! so i pulled over and let the car sit for a few minutes. all was ok again .... so i headed off ..... but only made it a further 50 metres down the road and it all happened again.
so after 3 times .... i guess calling for a tow truck was going to be the safest option.
even when the tow truck arrived after 45 minutes, the car would start up fine and idle ... but when i put my foot on the accelerator ..... nothing was happening.