A method is described for the diagnosis of the offset of the resolver of an electric machine, comprising acquiring a predetermined offset of a resolver associated with the electric machine; in a first transient, supplying an excitation current to the phases of the electric machine so as to determine the injection of an exploring excitation current on an axis d of minimum reluctance of the electric machine, in which the position of axis d is determined as a function of the predetermined offset of the resolver; in a second and in a third transient, respectively, supplying an excitation current to the phases of the electric machine so as to determine the injection of an exploring excitation current on the axis d of the electric machine, in which the position of the axis d is determined as a function of a offset of the resolver modified by a predetermined amount of deviation, in excess, respectively in defect with respect to the predetermined offset of the resolver. As a consequence of the excitation current, a current established on the axis d of minimum reluctance and a current established on an axis q in phase quadrature with respect to the axis of minimum reluctance are determined. The correctness of the offset of the resolver is diagnosed if the current established on the axis d in the first transient is higher than the current established on the axis d in the second or third transient, and if the current established on the axis q in the first transient is lower than the current established on the axis q in the second or third transient. An error in the offset of the resolver is diagnosed if the current established on the axis d in the first transient is lower than the current established on the axis d in the second or third transient, or if the current established on the axis q in the first transient is higher than the current established on the axis q in the second or third transient.