Why won't my gearbox go into gear?

My 2013 Citroen C4 is in the garage for a clutch repair. The symptoms are that it can't engage any gear with the engine running but can when the engine is off. The garage now say it's not the clutch and will have to remove the gearbox to investigate. Any advice would be appreciated.

Asked on 10 April 2025 by steven weekly

Answered by Alan Ross
The symptoms suggests that it is a clutch fault (unless it is the slave cylinder). If the garage is saying it is not the clutch we would ask what are they saying? It may be that they are suggesting the slave cylinder, which if so will require the removal of the gearbox. The slave cylinder is located on the top of the transmission making it difficult to access. You may want to ask them what they consider is the problem before they go ahead.
Similar questions
Are there any reliable DSG transmissions used in Volkswagens? If so, which makes and models use them?
What are Citroen's different auto gearboxes (EAT6, EGS6, ETG5) and which is the best and most reliable?
Any ideas why my focus won't go into first and second gear? It drives perfectly fine in third, fourth and fifth gears.