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The GM electronic suspension control module (ESCM) monitors the suspension struts and actuators to maintain ride height, damping, and stability. Diagnostic trouble codes C0575, C0580, and C0590 correspond to left-front, right-front, and rear suspension strut actuator circuit malfunctions respectively, or similar position/sensor circuit faults depending on the platform. Common causes include damaged wiring or connectors, corroded pins, a defective strut actuator or sensor, low battery voltage, and a failed ESCM. Diagnosis should begin with a visual inspection of the harness and connectors, a battery and charging system test, and a scan tool check for freeze frame data and related codes. Then measure actuator resistance and supply voltage according to the service information, and test the control module outputs for pulsed voltage or communication signals. In modern vehicles, suspension control is safety-related and may be subject to ISO 26262 functional safety requirements; repairs should use OEM-specific procedures and replace components with appropriate parts to preserve vehicle handling and stability.