What is the reason for the Audi A6 steering wheel not turning and displaying a steering failure?

[MacJuliet]

Audi A6 steering wheel not turning and displaying a steering failure reasons: 1. The vehicle's power steering pump is damaged. 2. The vehicle's steering gear is damaged. 3. The vehicle lacks power steering fluid. 4. The universal joint at the bottom of the steering wheel is damaged. The steering wheel not turning is a steering issue, and the vehicle should not be driven in this condition as it poses a danger. Additional information: If the steering wheel becomes difficult to turn during normal vehicle operation, the vehicle should be safely parked at a secure location at a safe speed. A safety warning sign should be placed 150 meters behind the vehicle. Then, inspect the vehicle's steering system to identify the specific fault for appropriate repair. If you are unable to repair it yourself, contact a nearby repair shop or the brand's after-sales service.