Apparently 'Eightinavee' on here has cured this fault code by changing driver pack. Don't think he knows why it cures it, and neither do i. Considering the driver pack has no connection to, and does not control the compressor or pressure switch at all. The thing the driver pack does is open and close the solenoid valves to inflate or deflate the airbags. It also closes the diaphragm solenoid valve when compressor is running to close exhaust port, and allow air into tank. Then opens it when compressor stops to exhaust pressure from inlet/exhaust gallery to allow air to be exhausted from bags. But it does not run the compressor, nor is the pressure switch link through it. So it's a bit of an enigma.