2002 GMC Envoy Rear air spring problems

REAR OF VEHICLE SITS LOW, ELECTRONIC CONTROLLED AIR SUSPENSION (ECAS) COMPRESSOR RUNS - WILL NOT LIFT REAR TO OPERATING HEIGHT (REPAIR ECAS COMPRESSOR WITH CHECK VALVE SERVICE KIT) ARTICLE BEGINNING DESCRIPTION BULLETIN CONTENT TECHNICAL SERVICE BULLETIN Reference Number(s): 02-03-99-001 GMC: 2002 Envoy/Envoy XL (New Body Style) with Electronically Controlled Air Suspension (RPO G67) OLDSMOBILE:2002 Bravada (New Body Style) SECTION:03 - Suspension Related Ref Number(s): 02-03-99-001 Rear Of Vehicle Sits Low, Electronic Controlled Air Suspension (ECAS) Compressor Runs - Will Not Lift Rear to Operating Height (Repair ECAS Compressor With Check Valve Service Kit) Some customers may comment that the rear of the vehicle sits low and will not return to normal operating height. The customer may be able to hear the ECAS compressor running.