'03 X308 trens fault sometimes with hard shifts, but goes away when warm

X300
1

My car has 76 K on it with original trans fluid. I did put an aftermarket trans tube and stick on it without losing any fluid, so I assume - by the height of the warm fluid on the stick - that it still has plenty.

As I said the trans fault light comes on when it has sat for a couple of day, but if I let it warm up it shifts fine. The light stays on till I stop and restart. ands then it’s fine. It’ll be fine if I use it the next day, but if I let it sit a fe3w days, I’ll get the fault light with the concomitant hard shifts till it warms.

Any idea what is going on?

Thanks.

2

Have the transmission serviced,new filter, fluid. Easy job yourself,I’ve just done mine, don’t forget to clean the magnets inside pan.

3

read the fault code first.

SOmething may need replacing or inspecting while the gearbox sump is off

4

Thanks for this. I was afraid I’d have to do something like this. It may take me awhile to do this though.

Thanks again.