Hummer H2 rear air suspension intermittently lowers overnight and requires engine activation to return to normal height on Hummer H2

Some Hummer H2 owners report experiencing intermittent lowering of the rear air suspension overnight, necessitating engine activation to restore normal height. These issues may stem from the air suspension system's design, which aims to maintain a level vehicle under varying loads. Owners have noted that problems with this system can lead to an imbalance in height between the left and right corners, resulting in the rear end dropping unexpectedly. Additionally, a constantly running compressor while the vehicle is on, or the rear dropping back to stock height when turned off, may signal underlying issues. Dashboard indicators showing "air suspension service required" and activated air lifts can contribute to the vehicle leaning to one side, indicating the need for prompt attention. Some owners find that resetting the height readings through a dealership's computer system can help recalibrate the ride height sensors, ensuring accurate readings and proper functioning of the air suspension system.