A valve diagnostic system for a suspension system (100, 200, 300, 400, 600, 700) of a vehicle, the valve diagnostic system comprising: a state module configured to selectively set a present state of a valve diagnostic for valves of the suspension system to a first state in a predetermined order of states; a valve control module configured to determine first target open and closed states for the valves of the suspension system based on the present state being set to the first state and to open and close the valves of the suspension system according to the first target open and closed states, respectively; a pump control module configured to, when the valves are in the first target open and closed states, respectively, selectively operate an electric pump of the suspension system in a first direction and pump hydraulic fluid toward the suspension system; and a diagnosis module, the valve diagnostic system characterised in that said diagnosis module is configured to: record first values of pressures within the suspension system measured using pressure sensors, respectively, before the operation of the electric pump in the first direction; record second values of the pressures within the suspension system measured using the pressure sensors, respectively, after a beginning of the operation of the electric pump; and selectively diagnose faults in a first subset of the valves based on whether pressure increases occurred in (b) the second values of the pressures relative to (a) the first values of the pressures, respectively. a state module configured to selectively set a present state of a valve diagnostic for valves of the suspension system to a first state in a predetermined order of states; a valve control module configured to determine first target open and closed states for the valves of the suspension system based on the present state being set to the first state and to open and close the valves of the suspension system according to the first target open and closed states, respectively; a pump control module configured to, when the valves are in the first target open and closed states, respectively, selectively operate an electric pump of the suspension system in a first direction and pump hydraulic fluid toward the suspension system; and a diagnosis module, the valve diagnostic system characterised in that said diagnosis module is configured to: record first values of pressures within the suspension system measured using pressure sensors, respectively, before the operation of the electric pump in the first direction; record second values of the pressures within the suspension system measured using the pressure sensors, respectively, after a beginning of the operation of the electric pump; and selectively diagnose faults in a first subset of the valves based on whether pressure increases occurred in (b) the second values of the pressures relative to (a) the first values of the pressures, respectively. record first values of pressures within the suspension system measured using pressure sensors, respectively, before the operation of the electric pump in the first direction; record second values of the pressures within the suspension system measured using the pressure sensors, respectively, after a beginning of the operation of the electric pump; and selectively diagnose faults in a first subset of the valves based on whether pressure increases occurred in (b) the second values of the pressures relative to (a) the first values of the pressures, respectively.