Chassis and ride-control systems
PASM electronically controls damping, while air suspension also regulates ride height; the two are not interchangeable. A warning can reflect a damper, height sensor, air spring, compressor, wiring or module issue depending on equipment.
How a technician distinguishes possible causes
Confirm the installed options and scan the chassis controller. For air suspension, measure ride height and inspect for leaks, valve-block problems and compressor operation. For damping faults, check circuits and commanded damper states. Inspect control-arm bushings and tire condition when handling complaints are present.
Repair and post-repair verification
Verify height stability, correct calibration and absence of suspension warnings after a controlled road test.
An uneven stance, compressor cycling or suspension warning can involve air springs, lines, valve blocks, height sensors or electrical faults.
If you are experiencing this issue, contact Mich’s Foreign Cars in Hickory, NC at 828-324-6012. Provide the model, year, engine, warning text and when the symptoms occur so the service team can discuss an appropriate diagnostic visit.