A method for sensor diagnostics in a seat suspension system includes: generating, by a first rotational position sensor, a motor position signal representing a rotational position of a motor shaft, the motor shaft being coupled to an output shaft, such that rotation of the motor shaft causes rotation of the output shaft; generating, by a second rotational position sensor, an output signal representing a rotational position of the output shaft coupled to a suspension mechanism to move a vehicle seat relative to a vehicle body; determining a diagnostic indicator value as a function of the motor position signal and the output signal; and determining, based on the diagnostic indicator value, an accuracy of the output signal to represent the rotational position of the output shaft.