Thanks for using JustAnswer.
My name is Vladimir.
Your air suspension
system is controlled by the suspension control module.
The system contains: air shock absorbers, height position sensors, compressor assy, control module, wiring,etc.
The air compressor assy is an electric type compressor with a receiver, vent solenoid, pressure sensor, etc.
This system should be diagnosed with a scan tool. The control module is able to store trouble codes for diagnostic purposes.
There are many possibilities that can cause system failure, from a faulty sensor or a chafed wire to the compressor assy. The most common problem on these vehicles is the compressor itself. It is located in an exposed to water and mud place, so its vent solenoid or a pressure sensor usually goes bad. It is not a cheap part, so you should not replace it without having the system tested first.
Without proper diagnostics, we could only guess .