A solenoid electrical diagnostic system comprising: a solenoid circuit operable in response to an electrical current, a low-side switch including a low-side input configured to receive a pulsed voltage signal and a low-side output in operable communication with the solenoid circuit, the low-side switch configured to continuously switch between an on-state and an off-state based on the pulsed voltage signal to adjust a level of the current flowing through the solenoid circuit; and a solenoid monitoring unit in operable communication with the low-side switch, the solenoid monitoring unit includes a first state detection circuit configured to generate a low-side output state signal based on an output voltage at the low-side output, and a second state detection circuit to generate a low-side input state signal based on an input voltage at the low-side input, wherein the low-side output state signal is high and the low-side input state signal is low when the pulsed voltage signal is high, and wherein the low-side output state signal is low and the low-side input state signal is high when the pulsed voltage is low; and an electronic hardware controller in operable communication with the solenoid monitoring unit, and configured to determine at least one operating condition of the solenoid circuit based on a comparison between the state signals and a threshold value; wherein the first state detection circuit comprises: a first semiconductor switch having a first base terminal connected to an output of a voltage divider circuit, a first collector terminal connected to a first end of a first pull-up resistor, and a first emitter terminal connected to a ground reference point; and the second state detection circuit comprises: a second semiconductor switch having a second base terminal connected to a first end of a gate resistor, a second collector terminal connected to a first end of a second pull-up resistor, and a second emitter terminal connected to a ground reference point. a solenoid circuit operable in response to an electrical current, a low-side switch including a low-side input configured to receive a pulsed voltage signal and a low-side output in operable communication with the solenoid circuit, the low-side switch configured to continuously switch between an on-state and an off-state based on the pulsed voltage signal to adjust a level of the current flowing through the solenoid circuit; and a solenoid monitoring unit in operable communication with the low-side switch, the solenoid monitoring unit includes a first state detection circuit configured to generate a low-side output state signal based on an output voltage at the low-side output, and a second state detection circuit to generate a low-side input state signal based on an input voltage at the low-side input, wherein the low-side output state signal is high and the low-side input state signal is low when the pulsed voltage signal is high, and wherein the low-side output state signal is low and the low-side input state signal is high when the pulsed voltage is low; and an electronic hardware controller in operable communication with the solenoid monitoring unit, and configured to determine at least one operating condition of the solenoid circuit based on a comparison between the state signals and a threshold value; wherein the first state detection circuit comprises: a first semiconductor switch having a first base terminal connected to an output of a voltage divider circuit, a first collector terminal connected to a first end of a first pull-up resistor, and a first emitter terminal connected to a ground reference point; and the second state detection circuit comprises: a second semiconductor switch having a second base terminal connected to a first end of a gate resistor, a second collector terminal connected to a first end of a second pull-up resistor, and a second emitter terminal connected to a ground reference point. a first semiconductor switch having a first base terminal connected to an output of a voltage divider circuit, a first collector terminal connected to a first end of a first pull-up resistor, and a first emitter terminal connected to a ground reference point; and the second state detection circuit comprises: a second semiconductor switch having a second base terminal connected to a first end of a gate resistor, a second collector terminal connected to a first end of a second pull-up resistor, and a second emitter terminal connected to a ground reference point.