GM tech = kk question = air compressor for back shocks come on but still have shaking when i reach up to 50 mph... What do i need to do to correct this?
KK: Not sure I understand the question. The rear shock compressor would have nothing to do with a vibration at speed. The rear compressor raises the rear of the car when there is a load in the back and the height sensor sees the car is too low. If the compressor runs but does not raise the rear, then a leaking line, shock, or bad pump may be faulty. A vibration at speed is usually caused by a tire out of balance, a bad tire, or a worn steering or suspension component, not the rear air suspension.