Gearbox troubles

Hi. Having issues with my charade g200 auto. The esat light starts flashing and im loosing gears whilst in drive. Anybody had this issue? Im trying to hunt down the electrical connection thats on the trans which connects to the wiring loom in the hope that it might be faulty and can be replaced. But cannot find a part or listing anywhere. Any help would be greatly appreciated.

The connection is on the passenger side near the charcoal canister down low near the firewall.