I have 2011 as well with the same issue. 3 weeks ago it hit 20F and I got ECS fault and suspension would not rise. Dealer replaced compressor relay. It appeared fixed but weather was much warmer. Yesterday morning it hit 19 F and same problem. I got it to the dealer yesterday afternoon but, it had warmed up to 36F; so issue was gone. Dealer says no system leaks and that it is most likely the compressor. $1,500 for the part and $400 to install with no guarantee that it fixes the intermittent problem. I love the car and am not ready to sell but, I can't afford to throw $2k at an issue that may or may not fix it. Not sure what I am going to do. Keep me posted on your issue and good luckEven I am having suspension problem. I have Equus 2011 model . In winter , when temperature drops , my car height becomes very low and it does not come up. I get ECS symbol on dashboard.
Sometime , its rear and sometimes its front .
I really don't know what's the issue causing it.
Anyone having same issue or any fix for it ?