Problem in SUSP. Range Rover

FRIENDS:

Once again, thanks for the interest in collaborating, I have a problem in the suspension, she does not respond to the command and remains in a high position is of a Range Rover 2006 HSE vehicle my scanner gives me suspension failure Error code:

C1A13 Pressure Does Not decrease When Venting Gallery.

I hope comments from your experiences and you can help me solve this failure.

Thanks in advance.