If a car jerks when it is put in reverse, this indicates a problem with the transmission, such as worn gears. If the gear becomes worn down or damaged, it can make it difficult for the car to shift smoothly.
If the vehicle contains a manual transmission, this can also be a symptom of a clutch failing. In this instance, the jerking is often felt when the clutch is completely engaged. Low transmission fluid levels can also cause the jerking. Users should first ensure that the fluids levels are correct. Ideally, the car should be checked by a mechanic to diagnose the malfunction.