2009 Escalade
 

Hope someone may be able to help. I'm having trouble with my 2009 escalade, almost a year ago the blind spot lights, traction control, and check engine lights came on - lack of power like in limp mode, would not go over 30 mph. Had vehicle scanned, multiple codes-cleared codes and almost immediately happened again-replaced the power control module -we unplugged the rear air compressor and vehicle operates fine. Has anyone experienced this or has any suggestions