Pulse Width Modulation (PWM) controls a wide range of automotive components, from throttle actuators to temperature sensors. CHEPQ oscilloscopes analyze the stability of PWM signals by measuring duty cycle variation, frequency jitter, and amplitude consistency. Variability beyond manufacturer tolerances often indicates failing drivers, wiring degradation, or interference, resulting in erratic component performance. Diagnosing duty cycle instability enables preemptive repair or recalibration, ensuring precise control and avoiding cascading faults in vehicle subsystems.