Mercedes-Benz ML63 AMG stiff steering and low whining noise with improved response at higher RPMs on Mercedes-Benz ML63 AMG

Some Mercedes-Benz ML63 AMG owners report experiencing stiff steering accompanied by a low whining noise, particularly noticeable when the engine is cold and at low RPMs. These issues may be linked to wheel bearing problems, especially if the noise changes with steering movements. Additionally, stiffness in the steering could stem from issues with the ball joints or steering knuckle, potentially leading to creaking noises. Some owners have noted that problems with the front suspension, such as excessive caster causing uneven wheel tilting, can contribute to both steering difficulties and noise during turns. The whining noise may become more pronounced at higher RPMs, suggesting a correlation with engine performance. To address these concerns, it is recommended that owners have their wheel bearings checked, inspect and possibly replace ball joints or steering knuckles, and consider a redesign of the front suspension if necessary. Regular maintenance is also advised to tackle common issues like whining noises, and monitoring noise levels and steering response at varying RPMs can help in diagnosing the problem effectively.