Airmatic Pump Motor May Fail Due to Sticking Relay on Mercedes-Benz CLS550

Problem Description and Possible Solution

A sticking relay, causing the airmatic pump motor to constantly run, may causee the airmatic pump motor to fail or the battery to go dead when the car is shut off. Worn airmatic pump mount bushings can causes noises in the front axle while driving on bumpy roads or a buzzing noise.

Problem Data
RepairPal Verified
Average mileage: 69,033 (10,000–170,000)
6 model years affected: 2007, 2008, 2009, 2010, more2011, 2012
34 people reported this problem
Viewing 1 - 20 of 22 comments
My car is visibly "crooked". The left side appears to be the normal height, but the right side is very low. I have no warning lights or error messages. It states "vehicle rising" so when I go to drive it I think it's lifting but not all the way. When parked the right side is 3-6" lower than the left.
Car has bottomed out and will not rise. I have changed the relay and air compressor, check all three Airmatic fuses (37, 39, & 41) and still doesn't rise. Any thoughts?
Turned the car off, pump motor continued operating for about 15 minutes. Made a loud buzzing sound and then an intermittent buzzing sound. Just happened last night so haven't had a solution yet.
I am having the same problem as reported. The driver side of my car is slammed while the passenger side appears fine. I noticed when I shut the car off to get gas that the front drivers side wheel area was still making noise. Took the relay out for time being until I can get into Mercedes. Hope its not too costly but I'm sure it will be!
The car makes a sound like air is coming from the right tire and will not lift
malfunction light comes on airpump not working
airmatic and esp malfunction light
Parked the car and went out of town. Was working fine. When i came back i started it and it said vehicle rising on dash board but the front driver side (Left) was not rising. I could hear the compressor kicking in but wasn't rising. I tried driving forward a few feet and the Red message came on Stop car too low. So i parked it back and now both the front and the back side is bottomed out on its suspension and wont raise.
ride height fine - eveb a bit high but compressor runs anyway even after shut off - I am replacing the entire system with manual springs and struts - screw them - its cheaper than constant repairs
Hasn't been fixed yet. Looking for a way to fix this issue.
airmatic seem to have failed bsck is lowere
Shocks/Struts gone. Vehicle sitting low. Estimate from Mercedes dealer of $6,000.
Airmatic Malfunctions
Suspension doesn't rise.
aie matic pump relay
Same problem. Taking to dealer tomorrow
I woke up the other day only to find my CLS550 4matic's back rear very low to the ground. I've had the car now for approx 30 months. I took it to the Mercedes Benz dealer and got the dreaded news. The rear air suspension system failed. Needs a new compressor and struts approx. $3800 in repairs. I purchased the car with 10k miles on it but it was sold as new because it had never been titled.

The dealership contacted MB who agreed to eat the cost for the part (appox $2600). I still have to pay for the labor. This car will be traded as soon as the repairs have been completed.
taking it to the car dealer
my cars airmatic will noy start or air up my front suspintion.
Left side won't come up stuck
car won't start after over night. car appears to be very low on front