NHTSA Complaint #11513897 — 2016 JEEP RENEGADE

recently while driving to work at a traffic light as i rolled i heard my car start to accelerate and the check engine light came on. I began to observe, and found out that the gearbox does this when it is downshifted from 5th to 4th gear. of course I didn't hit the car in front several times. the presence of such errors as u0402 and C2502. i went to the dealer but the dealer had never heard of this and only did a software update on the transmission and engine. but it didn't help, they changed the oil in the transmission, no result either, they gave me a document and said that the reason was the electricity. after searching the entire Internet, I saw that Cherokee had such a phantom acceleration for 14-15 years. and really the problem is inside the transmission. i want to fix this problem because the dealer doesn't know what to do.