Modern cars often have a safety mode that keeps the car from operating normally and incurring further damage when something goes wrong. It sounds like that may be the issue here. You'll likely need to take it to a professional for a thorough diagnosis.
RepairPal Certified shops can diagnose and repair your 2001 Mercedes-Benz ML55 AMG. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.