Self-leveling suspension cannot be adjusted during extremely cold weather. The self-leveling suspension warning light is illuminated in the instrument cluster. The self-leveling suspension operates normally again after the vehicle has been parked for a while in a garage or in the sun. DTC 20645 003 (valves for self-leveling control, mechanical fault) is present in the level control system module, J197 (address word 34). If the dryer on the air supply unit (air compressor) has taken in humidity for a long period of time, it may become saturated. As a result, the increased air humidity may get into the solenoid valve block and create condensation. In freezing temperatures, the condensation can freeze and block the valves, a condition that is recognized as a mechanical fault by the vehicle's self-diagnosis. Humidity can also enter the system if there is too much water in the air filter housing. Excess water can enter the air filter housing if the vehicle is driven in deep water or exposed to splashing water for an extended period of time (such as during off-road use).
