Join Date: Aug 2010
Location: I would rather not say
Sounds like you have a sticky accumulator or worn pump. FYI: If the selespeed light is blinking without sound, the pressure in the hydraulic circuit is too low. If it's beeping too, there's a signal problem with the sensors/electrovalves.
Try "OBD2 II KKL" on ebay. That cable worked for me. Diagnose the hydraulic pressure: the pump should start @<=45bar and prime up to 55bar, the priming should last for a few seconds and pressure should increase smoothly. Once @55 bar you should be able to perform 2-3 gear changes before the pump starts again.