PSM stands for Porsche Stability Management. Depending on your year and model, the system function may vary. However, the goal is the same. PSM is an integrated logic between braking, suspension, steering, and drivetrain functions. If you have a PSM warning light illuminated, a fix could be as simple as replacing the battery or a faulty sensor. Sometimes a more complicated issue is indicated. Only a scan at our service center will reveal the exact issue.