Yaris 56 plate semi auto

[zoidberg444]

If it's attempting to change it sounds like the Solenoid is working fine. That the problem is mechanical, not electrical. These semi-automatic gearboxes are always trouble. Almost sounds like the syncho's aren't gripping and it's having trouble slotting the gears in. In the past before i changed my gearbox oil i noticed it in my own manual transmission car that sometimes you had to have a second go or use a bit more force with the gear change when the car was cold.

What gearbox oil did you put in it? Many people on here have had bad experiences with Mobile gearbox oil. I use a 75W90 GL4 semi synthetic made by Comma. It's pretty cheap but from what i hear these boxes prefer the cheaper dino oil because it allows the syncros to grab better.