Turbo Wastegate Solenoid Valve Fits Cruze Sonic Encore Equinox Terrain Vanderhall Replaces GM 55573259, GM 55559239, GM 55574902 I have diagnosed endless overboost problems and what I have found over the years of diagnosing these turbos is the main culprit of an overboost issue is either leaking hoses or a bad wastegate control solenoid. I have found that these get packed up with gunk over the years and it's just better to replace them than to clean them out. They are simply too small to clean up internally. Also, if hoses are cracked and leaking or blocked, you will have tons of boosting issues on your turbo and wastegate system. I set this listing up so you can choose which vehicle you have, if you want upgraded hoses or just the valve itself. I may add upgraded clamps as well. (Screw style instead of pinch style). I have solved many symptoms even flutation throttle and boost problems with simple clamp changes. I have fixed many types of overboost issues and boost fluctuations with a nice clean brand new solenoid and hoses. These are stronger units than OEM. I worked with a company that takes them apart and internally and modifies them so they work more efficient.  NOTE: One of the leading causes of these going bad is not running a PCV re-route or catch canister / oil separator. Here are links to my reroute kits. Without this you will constantly be dumping oil and debris into your sensors through the turbo.  Gen 2 Cruze/ 1.5 Malibu, Equinox, Terrain version https://supercruzesstore.com/products/2016-2019-cruze-catch-can-with-pcv-fix Gen 1 Cruze, Trax, Sonic, Encore, versions. https://supercruzesstore.com/products/pcv-fix-kits https://supercruzesstore.com/products/pcv-fix-kits-buick-versions