Error after 2 thousand cycles

First of all greetings my friends vehicle 1.4 hdi xr. The problem in the car is that the engine gives an error signal after 2500 revolutions in second gear, but the error does not appear on any panel or display, and this error happens if I bring it fast to 2500 revolutions. For example, if I bring 2500e slowly, there is no problem. But when I take a little speed, it gives error, there is no problem with other gears. If you help, I will be very happy to develop.

any muscle-power cutting, etc. in the vehicle. events like are observed?

How many models of vehicles?