What's wrong with Changan Ruicheng cc 1.5t, which can only accelerate two thousand revolutions?

If this is an automatic transmission, the original state is normal. If the speed cannot rise at 2000 rpm during normal driving, there is something wrong with the engine.

Generally, the throttle valve is too dirty to work normally. You can clean the throttle. The price of cleaning the throttle valve is around 50 yuan. After cleaning the throttle, be sure to cooperate well to avoid affecting the idle speed.