I have a 2009 chevy avalanche that the air ride don't work. And says service suspension system.? I took to dealer and said the compressor was bad and rear shocks was leaking. So I put all new on it. It worked for 6 months and now it's back to not working again. I checked power at the compressor and it has power and a good ground. Checked the red with white teacher wire. It's good I checked all the levelers on all for corners to see if maybe one or more was bad but didn't help. Checked all fuses they are all good too. I got the parts from rock auto. Not rebuilt they were new with the same part number as chevy. Could it be possible that the pump went out again. Any help would be appreciated thanks Bill

 

Run wires to the compressor directly from the battery to see if the compressor works.