Hey there everyone
Had a 2010 Hyundai i30 1.6L petrol, automatic gearbox. Used for a while and a problem showed up. When you cold start the car and drive for 8-9 miles, it breaks down with down shifting 4 to 1 and locking up the tires for just a one second and then car stuck at 3rd gear. Engine light shows up. Stop the car and push the pedal; doesnt matter. It stays 3rd gear. Turn ignition off and on again, engine light still on but the car perfectly shifting until 3rd gear, when it shifts 4th gear, it stuck again on 3rd. If you use it in 3rd, it perfectly up and down shifts. The situation is this.
What I've done is; opened up whole transmission, nothing seems wrong, changed the oil, changed the valve body (brand new), dtc says; P0760 Shift solenoid 'c' valve; still the same. Please help up if you know something