I had same . Stuck in 3rd and D flashing . Loom changed and now fine . Loom is £150 from mitsubishi .
Mitsubishi informed me they had sold 4 of these looms in past month . There is a white platic box bit attathed to go over gearbox . This is the loom you require if the fault is same . Solenoids and ecu are rarely a problem so i was informed when i took mine to mitzi .
Thanks for this.
I was wondering what the cost would be to just replace the whole gearbox loom and whether the 150 quid covers all of it.
It's booked into Mitsubishi garage in edinburgh for them to spend an hour plugging into diagnosos machine and checking the wiring so will see what happens. Even if they find nothing I wonder whether it would be sensible for a replacement wiring look anyway given at times the issue is intermittent.
Just hope it does it on thursday when they are looking at it ! Plan is to drop off night before to make sure it;'s completely cold when they have a look.