CLS Power steering fault but only when stationary

[derekpayne]

I have a 2008 CLS 320 which has developed a power steering fault, it doesn't work with the vehicle stationary, but as soon as you start to move its fine. First of all I suspected the pump but now I'm not so sure?

I have checked the fluid level and that's fine.

Any thoughts would be appreciated.

 

[ALFAitalia]

Does it work when stationary and in neutral if you raise the revs off idle?

 

[derekpayne]

I have tried that, it makes a very slight difference but still too stiff, I have done more research and I believe it is the Speed sensitive power steering solenoid valve that's faulty. Its fine when you start driving or moving even about 2 miles per hour but parking is a struggle.