Citroen C3 i have a new c3 from august 2021 with only 6300 km

With a car of that year and under warranty , If they have seen the fault , insist they resolve the issue . If still having no joy , try another dealership or contact Citroen direct and express your concerns over this matter and the way it has been handled so far.

I did contact the importer and told them a computer check was done at a local Citroen dealer in Ashkelon, however. no problem was found and they did a reset . The problem persists, however. Could it be that the gearbox needs oil?

Unusual if gearbox needs oil and you would think it would have been checked , even during routine servicing . I would have thought it may be a faulty sensor which should have shown if fault present when a diagnostic scan had been carried out .

New C3 auto petrol driven for 8 miles parked outside overnight in frost. On starting early Next morning Gearbox fault indicated and car Went into “limp” mode.

When Collected by dealership a few hours later fault had cleared from system but Later road test showed car will fault when driven at 50mph+. Fault diagnosed to engine throttle system and accelerator pedal module replaced.

Hello.
Same problem here,in Greece,with a C3 turbo gasoline with automatic transmission.
Happens in no hurry driving and normal conditions.
Citroen dealer says they cannot see anything,because problem is cleared from the car.
Their suggestion is to keep it running direct to them with the fault indicated,but this is almost impossible!
Car is 10month old,and we get it brand new.
Happens on summer and winter,and 7 times total.
Car is has no problem or feeling strange during the fault.