Loads of info on the 'net about these.
I've got one at the moment the customer gave to me after it developed the problem.
The usual cause is the gear selector motor mechanism on the front of the gearbox.
Looking down on the mech from the top there is what looks like a circular plastic cap. This is the end of a plastic sleeve bearing that supports the end of a motor driven rack arrangement.
Due to Bosch's lovely design this bush is very thin walled and corrosion grows down the outside of the bush making it tighten up on the rack shaft and eventually seizing the rack to the point that the motor cannot move it. It can be dismantled and in my case I ran the die grinder through the bush with a split mandrel and some emery strip and freed it off beautifully.
The rack has to go back in the same relationship to the motor or the position feedback will be incorrect (not hard, the rack pitch is very coarse).
Unfortunately with mine it had been so messed with before I saw it that I think the driver circuit in the controller is now U/S.
Repair of the unit is a possible but exchange/renewal of the unit requires IDS or similar to be able to re-teach settings.
Other possibilities are that loom faults also seem to be reasonably common.
Hope this helps, Shaun
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