NuclearVision wrote
My second C3 transmission as did my first, Will sometimes without any reason or notice, go into safe mode(4 speed->2speed). Never again will i own a french car, toyotas are appealing, good engineering, cheap parts, and unlike citroen, mechanics don't cringe when they see your car's logo.
Mine does something like that. It goes into 3rd gear (with a bang) and stays stuck there with an error message. Limp mode. If I restart the car it works again (yay! Like Windows!).
It is not random, it does that if I make it suffer, after driving mostly uphill on a hot day, for example.
There is a technique that I found to reduce the problem.
When the car is for example in 2nd gear, and in low RPM, you will feel as if the clutch is un-coupled and there is some amount of slippage (torque converter in use). Whenever the RPM reaches 2000+ or something like that you can feel the clutch being coupled and the engine becoming directly connected to the drivetrain.
When ever it is in the low-rpm transitional period, be veeeeery gentle with the car, let it pick up speed slowly until you can feel that the clutch is fully coupled, then you can be heavy on the accelerator.
Also do not do gear changes in very high RPMs if possible. Do not change too early either because that means it will be using the torque converter too much, so you might have to use manual mode ("tiptronic") to control that.
Through driving carefully I have been able to eliminate this problem, even when I drive up the mountains, etc.