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Service Air Suspension Message On Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that one or more of the following Diagnostic Trouble Codes (DTCs) have been set: ? C15A1-00 - Unable To Obtain Desired Ride Height. ? C1509-00 - Low Airmass. Customer may also comment on one or more of the following: ? Service Air Suspension message on in the Electronic Vehicle Information Center (EVIC). ? One corner of the vehicle is sagging. ? Vehicle may not be able to achieve desired ride height. This bulletin involves inspecting the air lines at the fast down leveling valve and possibly properly seating the air lines.